Snake and ladder

From Rosetta Code


Snake and ladder is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
Task

Create a Snakes and Ladders game where the computer plays against a human player.


This game is also known as   Chutes and Ladders.

For a board example you can use this image here: snakes & ledders.

(A ledder is the Old English word for a ladder.)


The way you'll represent the board and the players' tokens is totally up to you: graphics or ASCII graphics or even just text.

Happy coding.

11l[edit]

Translation of: Python
V snl = [4 = 14,
         9 = 31,
         17 = 7,
         20 = 38,
         28 = 84,
         40 = 59,
         51 = 67,
         54 = 34,
         62 = 19,
         63 = 81,
         64 = 60,
         71 = 91,
         87 = 24,
         93 = 73,
         95 = 75,
         99 = 78]

V sixesRollAgain = 1B

F turn(player, =square)
   L
      V roll = random:(1 .. 6)
      print(‘Player #. on square #., rolls a #.’.format(player, square, roll), end' ‘’)
      I square + roll > 100
         print(‘ but cannot move.’)
      E
         square += roll
         print(‘ and moves to square #.’.format(square))
         I square == 100
            R 100
         V next = :snl.get(square, square)
         I square < next
            print(‘Yay! landed on a ladder. Climb up to #..’.format(next))
            I square == 100
               R 100
            square = next
         E I square > next
            print(‘Oops! Landed on a snake. Slither down to #..’.format(next))
            square = next
      I roll < 6 | !:sixesRollAgain
         R square
      print(‘Rolled a 6 so roll again.’)

F main()
   V players = [1, 1, 1]
   L
      L(i) 0..2
         V ns = turn(i + 1, players[i])
         I ns == 100
            print(‘Player #. wins!’.format(i + 1))
            R
         players[i] = ns
         print()

main()
Output:

The same as in Python.

ALGOL 68[edit]

Fully automated game, the user is initially promoted for a number of players (up to 10, 0 or less exits without playing). The user is also prompted as to whether a player can win by reaching a square greater than the final one and also whether a player can throw again after throwing a 6.

BEGIN # Snakes and ladders game #
    # create the board #
    INT max square = 100;
    [ 1 : max square ]INT board;
    FOR i TO max square DO board[ i ] := 0 OD;
    board[  4 ] := 14;
    board[  9 ] := 31;
    board[ 17 ] :=  7;
    board[ 20 ] := 38;
    board[ 28 ] := 84;
    board[ 40 ] := 59;
    board[ 51 ] := 67;
    board[ 54 ] := 34;
    board[ 62 ] := 19;
    board[ 63 ] := 81;
    board[ 64 ] := 60;
    board[ 71 ] := 91;
    board[ 87 ] := 24;
    board[ 93 ] := 73;
    board[ 95 ] := 75;
    board[ 99 ] := 78;
    # get options #
    INT players := 0;
    WHILE print( ( "How many players ( 1-10, 0 or less to quit ) ? " ) );
          read( ( players, newline ) );
          players > 10
    DO
        print( ( "Too many players" ) )
    OD;
    IF players > 0 THEN
        # the user does want to play #
        BOOL win on gt max := FALSE;
        WHILE print( ( "Allow position > ", whole( max square, 0 ), " to win [y/n] ? " ) );
              CHAR c;
              read( ( c, newline ) );
              win on gt max := c = "y";
              c /= "y" AND c /= "n"
        DO SKIP OD;
        BOOL extra roll for 6 := FALSE;
        WHILE print( ( "Roll again on a 6 [y/n] ? " ) );
              CHAR c;
              read( ( c, newline ) );
              extra roll for 6 := c = "y";
              c /= "y" AND c /= "n"
        DO SKIP OD;
        [ 1 : players ]INT position;
        FOR i TO players DO position[ i ] := 0 OD;
        # play #
        BOOL game over := FALSE;
        WHILE NOT game over DO
            # handle each players move #
            print( ( newline ) );
            FOR p TO players WHILE NOT game over DO
                WHILE
                    INT roll = ENTIER ( next random * 6 ) + 1;
                    STRING player id = "Player " + whole( p, 0 );
                    print( ( player id
                           , IF position[ p ] < 1 THEN "" ELSE " (on square " + whole( position[ p ], 0 ) + ")" FI
                           , " rolls a "
                           , whole( roll, 0 )
                           , newline
                           )
                         );
                    IF  position[ p ] + roll > max square
                    AND NOT win on gt max
                    THEN
                        # the player would be off the board #
                        print( ( "    ", player id, " cannot move", newline ) )
                    ELSE
                        # the player can move roll squares #
                        position[ p ] +:= roll;
                        IF position[ p ] > max square THEN position[ p ] := max square FI;
                        print( ( "    and moves to square ", whole( position[ p ], 0 ) ) );
                        IF board[ position[ p ] ] > position[ p ] THEN
                            # landed on a ladder #
                            position[ p ] := board[ position[ p ] ];
                            print( ( " - which is a ladder :) ", player id, " climbs to up ", whole( position[ p ], 0 ), newline ) )
                        ELIF board[ position[ p ] ] /= 0 THEN
                            # landed on a snake #
                            position[ p ] := board[ position[ p ] ];
                            print( ( " - which is a snake :( ", player id, " slides down to ", whole( position[ p ], 0 ), newline ) )
                        ELIF position[ p ] >= max square THEN
                            # the player has won #
                            print( ( " and wins the game!", newline ) );
                            game over := TRUE
                        ELSE
                            # not a ladder, snake or winning move #
                            print( ( newline ) )
                        FI
                    FI;
                    roll = 6 AND extra roll for 6 AND NOT game over
                DO
                    print( ( player id, " can roll again...", newline ) )
                OD
            OD                    
        OD
    FI
END
Output:

Sample game.

How many players ( 1-10, 0 or less to quit ) ? 4
Allow position > 100 to win [y/n] ? n
Roll again on a 6 [y/n] ? y

Player 1 rolls a 1
    and moves to square 1
Player 2 rolls a 4
    and moves to square 4 - which is a ladder :) Player 2 climbs to up 14
Player 3 rolls a 6
    and moves to square 6
Player 3 can roll again...
Player 3 (on square 6) rolls a 3
    and moves to square 9 - which is a ladder :) Player 3 climbs to up 31
Player 4 rolls a 2
    and moves to square 2
...
Player 1 (on square 36) rolls a 2
    and moves to square 38
Player 2 (on square 84) rolls a 3
    and moves to square 87 - which is a snake :( Player 2 slides down to 24
Player 3 (on square 44) rolls a 1
    and moves to square 45
Player 4 (on square 14) rolls a 6
    and moves to square 20 - which is a ladder :) Player 4 climbs to up 38
Player 4 can roll again...
Player 4 (on square 38) rolls a 3
    and moves to square 41
...
Player 1 (on square 79) rolls a 6
    and moves to square 85
Player 1 can roll again...
Player 1 (on square 85) rolls a 4
    and moves to square 89
Player 2 (on square 92) rolls a 6
    and moves to square 98
Player 2 can roll again...
Player 2 (on square 98) rolls a 2
    and moves to square 100 and wins the game!

AWK[edit]

# syntax: GAWK -f SNAKE_AND_LADDER.AWK [players]
# example: GAWK -f SNAKE_AND_LADDER.AWK 3
BEGIN {
    players = (ARGV[1] ~ /^[0-9]+$/) ? ARGV[1] : 2
    load_board()
    show_board()
    if (players == 0) { exit(0) }
    for (i=1; i<=players; i++) {
      sq_arr[i] = 1 # all players start on square 1
    }
    srand() # seed rand() with time of day
    while (1) {
      printf("\nTurn #%d\n",++turns)
      for (i=1; i<=players; i++) {
        ns = turn(i,sq_arr[i])
        if (ns == 100) {
          printf("Player %d wins after %d moves\n",i,moves)
          exit(0)
        }
        sq_arr[i] = ns
      }
    }
}
function load_board() {
# index < value is a ladder
# index > value is a snake
    sl_arr[ 4] = 14
    sl_arr[ 9] = 31
    sl_arr[17] =  7
    sl_arr[20] = 38
    sl_arr[28] = 84
    sl_arr[40] = 59
    sl_arr[51] = 67
    sl_arr[54] = 34
    sl_arr[62] = 19
    sl_arr[63] = 81
    sl_arr[64] = 60
    sl_arr[71] = 91
    sl_arr[87] = 24
    sl_arr[93] = 73
    sl_arr[95] = 75
    sl_arr[99] = 78
}
function show_board(  board_arr,i,pos,row,L,S) {
    PROCINFO["sorted_in"] = "@ind_num_asc"
# populate board with cell numbers
    for (i=1; i<=100; i++) {
      board_arr[i] = i
    }
# add in Snakes & Ladders
    for (i in sl_arr) {
      board_arr[sl_arr[i]] = board_arr[i] = (i+0 < sl_arr[i]) ? sprintf("L%02d",++L) : sprintf("S%02d",++S)
    }
# print board
    print("board: L=ladder S=snake")
    for (row=10; row>=1; row--) {
      if (row ~ /[02468]$/) {
        pos = row * 10
        for (i=1; i<=10; i++) {
          printf("%5s",board_arr[pos--])
        }
      }
      else {
        pos = row * 10 - 9
        for (i=1; i<=10; i++) {
          printf("%5s",board_arr[pos++])
        }
      }
      printf("\n")
    }
}
function turn(player,square,  position,roll) {
    while (1) {
      moves++
      roll = int(rand() * 6) + 1 # roll die
      printf("Player %d on square %d rolls a %d",player,square,roll)
      if (square + roll > 100) {
        printf(" but cannot move\n")
      }
      else {
        square += roll
        printf(" and moves to square %d\n",square)
        if (square == 100) {
          return(100)
        }
        position = (square in sl_arr) ? sl_arr[square] : square
        if (square < position) {
          printf("Yay! Landed on a ladder so climb up to %d\n",position)
        }
        else if (position < square) {
          printf("Oops! Landed on a snake so slither down to %d\n",position)
        }
        square = position
      }
      if (roll < 6) {
        return(square)
      }
      printf("Rolled a 6 so roll again\n")
    }
}

Sample command and output:

GAWK -f SNAKE_AND_LADDER.AWK 3

board: L=ladder S=snake
  100  S08   98   97   96  S07   94  S06   92  L08
  L07   82   83  L04   85   86  S05   88   89   90
   80   79  S08   77   76  S07   74  S06   72  L08
   61  S03  L07  S04   65   66  L06   68   69   70
  S04  L05   58   57   56   55  S02   53   52  L06
   41   42   43   44   45   46   47   48   49   50
  L05   39  L03   37   36   35  S02   33   32  L02
   21   22   23  S05   25   26   27  L04   29   30
  L03  S03   18  S01   16   15  L01   13   12   11
    1    2    3  L01    5    6  S01    8  L02   10

Turn #1
Player 1 on square 1 rolls a 4 and moves to square 5
Player 2 on square 1 rolls a 5 and moves to square 6
Player 3 on square 1 rolls a 3 and moves to square 4
Yay! Landed on a ladder so climb up to 14

Turn #2
Player 1 on square 5 rolls a 2 and moves to square 7
Player 2 on square 6 rolls a 6 and moves to square 12
Rolled a 6 so roll again
Player 2 on square 12 rolls a 3 and moves to square 15
Player 3 on square 14 rolls a 2 and moves to square 16

Turn #3
Player 1 on square 7 rolls a 5 and moves to square 12
Player 2 on square 15 rolls a 1 and moves to square 16
Player 3 on square 16 rolls a 1 and moves to square 17
Oops! Landed on a snake so slither down to 7

...

Turn #44
Player 1 on square 98 rolls a 5 but cannot move
Player 2 on square 47 rolls a 2 and moves to square 49
Player 3 on square 89 rolls a 5 and moves to square 94

Turn #45
Player 1 on square 98 rolls a 2 and moves to square 100
Player 1 wins after 155 moves


BASIC[edit]

BASIC256[edit]

Translation of: FreeBASIC
arraybase 1
global SNL
map SNL
SNL[ 4] = 14
SNL[ 9] = 31
SNL[17] =  7
SNL[20] = 38
SNL[28] = 84
SNL[40] = 59
SNL[51] = 67
SNL[54] = 34
SNL[62] = 19
SNL[63] = 81
SNL[64] = 60
SNL[71] = 91
SNL[87] = 24
SNL[93] = 73
SNL[95] = 75
SNL[99] = 78

dim players(3)
players = {1, 1, 1}

do
	for i = 1 to players[?]
		ns = Turn(i, players[i - 1])
		if ns = 100 then
			print "Player "; i; " wins!"
			exit do
		end if
		players[i - 1] = ns
		print
	next i
until False
end

function Turn(player, square)
	sixesThrowAgain = True
	do
		roll = int(rand * 6)
		print "Player "; player; ", on square "; square; ", rolls a "; roll;
		if square + roll > 100 then
			print " but cannot move."
		else
			square += roll
			print " and moves to square "; square
			if square = 100 then return 100

			nxt = square
			if SNL[square, square] then nxt = SNL[nxt, nxt]
			if square < nxt then
				print "Yay! Landed on a ladder. Climb up to "; nxt; "."
				if nxt = 100 then return 100
				square = nxt
			else
				if square > nxt then
					print "Oops! Landed on a snake. Slither down to "; nxt; "."
					square = nxt
				end if
			end if
		end if

		if roll < 6 or not sixesThrowAgain then return square
		print "Rolled a 6 so roll again."
	until False
end function


C[edit]

Translation of: C++
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

bool sixesThrowAgain = true;

void init() {
    srand((unsigned int)time(NULL));
}

int rollDice() {
    return rand() % 6 + 1;
}

int nextSquare(int square) {
    switch (square) {
    case  4:  return 14;
    case  9:  return 31;
    case 17:  return  7;
    case 20:  return 38;
    case 28:  return 84;
    case 40:  return 59;
    case 51:  return 67;
    case 54:  return 34;
    case 62:  return 19;
    case 63:  return 81;
    case 64:  return 60;
    case 71:  return 91;
    case 87:  return 24;
    case 93:  return 73;
    case 95:  return 75;
    case 99:  return 78;
    default: return square;
    }
}

int turn(int player, int square) {
    int roll, next;
    while (true) {
        roll = rollDice();
        printf("Player %d, on square %d, rolls a %d", player, square, roll);
        if (square + roll > 100) {
            printf(" but cannot move.\n");
        } else {
            square += roll;
            printf(" and moves to square %d\n", square);
            if (square == 100) return 100;
            next = nextSquare(square);
            if (square < next) {
                printf("Yay! Landed on a ladder. Climb up to %d.\n", next);
                square = next;
            } else if (next < square) {
                printf("Oops! landed on a snake. Slither down to %d.\n", next);
                square = next;
            }
        }
        if (roll < 6 || !sixesThrowAgain) return square;
        printf("Rolled a 6 so roll again.\n");
    }
}

int main() {
    int players[3] = { 1, 1, 1 };
    int i, ns;

    init();

    while (true) {
        for (i = 0; i < sizeof(players) / sizeof(int); ++i) {
            ns = turn(i + 1, players[i]);
            if (ns == 100) {
                printf("Player %d wins!\n", i + 1);
                goto out;
            }
            players[i] = ns;
            printf("\n");
        }
    }

out:
    return 0;
}

C#[edit]

Translation of: Kotlin
using System;
using System.Collections.Generic;

namespace SnakeAndLadder {
    class Program {
        private static Dictionary<int, int> snl = new Dictionary<int, int>() {
            {4, 14},
            {9, 31},
            {17, 7},
            {20, 38},
            {28, 84},
            {40, 59},
            {51, 67},
            {54, 34},
            {62, 19},
            {63, 81},
            {64, 60},
            {71, 91},
            {87, 24},
            {93, 73},
            {95, 75},
            {99, 78},
        };
        private static Random rand = new Random();
        private const bool sixesThrowAgain = true;

        static int Turn(int player, int square) {
            while (true) {
                int roll = rand.Next(1, 6);
                Console.Write("Player {0}, on square {1}, rolls a {2}", player, square, roll);
                if (square + roll > 100) {
                    Console.WriteLine(" but cannot move.");
                } else {
                    square += roll;
                    Console.WriteLine(" and moves to square {0}", square);
                    if (square == 100) return 100;
                    int next = square;
                    if (snl.ContainsKey(square)) {
                        next = snl[square];
                    }
                    if (square < next) {
                        Console.WriteLine("Yay! Landed on a ladder. Climb up to {0}.", next);
                        if (next == 100) return 100;
                        square = next;
                    } else if (square > next) {
                        Console.WriteLine("Oops! Landed on a snake. Slither down to {0}.", next);
                    }
                }
                if (roll < 6 || !sixesThrowAgain) return square;
                Console.WriteLine("Rolled a 6 so roll again.");
            }
        }

        static void Main(string[] args) {
            // three players atarting on square one
            int[] players = { 1, 1, 1 };
            while (true) {
                for (int i = 0; i < players.Length; i++) {
                    int ns = Turn(i + 1, players[i]);
                    if (ns == 100) {
                        Console.WriteLine("Player {0} wins!", i + 1);
                        return;
                    }
                    players[i] = ns;
                    Console.WriteLine();
                }
            }
        }
    }
}

C++[edit]

Translation of: C#
#include <iostream>
#include <map>
#include <random>

std::default_random_engine generator;
std::uniform_int_distribution<int> dice(1, 6);
int rollDice() {
    return dice(generator);
}

const bool sixesThrowAgain = true;
const std::map<int, int> snl{
    {4, 14},
    {9, 31},
    {17, 7},
    {20, 38},
    {28, 84},
    {40, 59},
    {51, 67},
    {54, 34},
    {62, 19},
    {63, 81},
    {64, 60},
    {71, 91},
    {87, 24},
    {93, 73},
    {95, 75},
    {99, 78},
};

// taken from https://stackoverflow.com/a/2333816
template <template<class, class, class...> class C, typename K, typename V, typename... Args>
V GetWithDef(const C<K, V, Args...>& m, K const& key, const V & defval) {
    typename C<K, V, Args...>::const_iterator it = m.find(key);
    if (it == m.end())
        return defval;
    return it->second;
}

int turn(int player, int square) {
    while (true) {
        int roll = rollDice();
        printf("Player %d, on square %d, rolls a %d", player, square, roll);
        if (square + roll > 100) {
            printf(" but cannot move.\n");
        } else {
            square += roll;
            printf(" and moves to square %d\n", square);
            if (square == 100) return 100;
            int next = GetWithDef(snl, square, square);
            if (square < next) {
                printf("Yay! Landed on a ladder. Climb up to %d.\n", next);
                square = next;
            } else if (next < square) {
                printf("Oops! landed on a snake. Slither down to %d.\n", next);
                square = next;
            }
        }
        if (roll < 6 || !sixesThrowAgain)return square;
        printf("Rolled a 6 so roll again.\n");
    }
}

int main() {
    // three players starting on square one
    int players[] = { 1, 1, 1 };

    while (true) {
        for (int i = 0; i < sizeof(players) / sizeof(int); ++i) {
            int ns = turn(i + 1, players[i]);
            if (ns == 100) {
                printf("Player %d wins!\n", i + 1);
                goto out;
            }
            players[i] = ns;
            printf("\n");
        }
    }

out:
    return 0;
}

D[edit]

Translation of: Raku
import std.stdio;

//Board layout, start square to end square
auto snl() {
    // Workaround for not being able to static initialize an AA
    int[int] temp;
    temp[4] = 14;
    temp[9] = 31;
    temp[17] = 7;
    temp[20] = 38;
    temp[28] = 84;
    temp[40] = 59;
    temp[51] = 67;
    temp[54] = 34;
    temp[62] = 19;
    temp[63] = 81;
    temp[64] = 60;
    temp[71] = 91;
    temp[87] = 24;
    temp[93] = 73;
    temp[95] = 75;
    temp[99] = 78;
    return temp;
}

int turn(int player, int square) {
    import std.random;

    auto roll = uniform!"[]"(1, 6);
    write("Player ", player, " on square ", square, " rolls a ", roll);
    if (square + roll > 100) {
        writeln(" but cannot move. Next players turn.");
        return square;
    } else {
        square += roll;
        writeln(" and moves to square ", square);
    }

    auto next = snl().get(square, square);
    if (square < next) {
        writeln("Yay! Landed on a ladder. Climb up to ", next);
    } else if (square > next) {
        writeln("Oops! Landed on a snake. Slither down to ", next);
    }
    return next;
}

void main() {
    // three players starting on square one
    auto players = [1, 1, 1];

    while(true) {
        foreach(i,s; players) {
            auto ns = turn(i+1, s);
            if (ns == 100) {
                writeln("Player ", i+1, " wins!");
                return;
            }
            players[i] = ns;
            writeln;
        }
    }
}
Output:
Player 1 on square 1 rolls a 5 and moves to square 6

Player 2 on square 1 rolls a 6 and moves to square 7

Player 3 on square 1 rolls a 5 and moves to square 6

Player 1 on square 6 rolls a 6 and moves to square 12

Player 2 on square 7 rolls a 4 and moves to square 11

Player 3 on square 6 rolls a 3 and moves to square 9
Yay! Landed on a ladder. Climb up to 31

Player 1 on square 12 rolls a 1 and moves to square 13

Player 2 on square 11 rolls a 1 and moves to square 12

Player 3 on square 31 rolls a 1 and moves to square 32

Player 1 on square 13 rolls a 5 and moves to square 18

Player 2 on square 12 rolls a 5 and moves to square 17
Oops! Landed on a snake. Slither down to 7

Player 3 on square 32 rolls a 5 and moves to square 37

Player 1 on square 18 rolls a 3 and moves to square 21

Player 2 on square 7 rolls a 2 and moves to square 9
Yay! Landed on a ladder. Climb up to 31

Player 3 on square 37 rolls a 3 and moves to square 40
Yay! Landed on a ladder. Climb up to 59

Player 1 on square 21 rolls a 3 and moves to square 24

Player 2 on square 31 rolls a 2 and moves to square 33

Player 3 on square 59 rolls a 5 and moves to square 64
Oops! Landed on a snake. Slither down to 60

Player 1 on square 24 rolls a 3 and moves to square 27

Player 2 on square 33 rolls a 5 and moves to square 38

Player 3 on square 60 rolls a 1 and moves to square 61

Player 1 on square 27 rolls a 6 and moves to square 33

Player 2 on square 38 rolls a 3 and moves to square 41

Player 3 on square 61 rolls a 3 and moves to square 64
Oops! Landed on a snake. Slither down to 60

Player 1 on square 33 rolls a 3 and moves to square 36

Player 2 on square 41 rolls a 1 and moves to square 42

Player 3 on square 60 rolls a 4 and moves to square 64
Oops! Landed on a snake. Slither down to 60

Player 1 on square 36 rolls a 2 and moves to square 38

Player 2 on square 42 rolls a 2 and moves to square 44

Player 3 on square 60 rolls a 4 and moves to square 64
Oops! Landed on a snake. Slither down to 60

Player 1 on square 38 rolls a 5 and moves to square 43

Player 2 on square 44 rolls a 6 and moves to square 50

Player 3 on square 60 rolls a 5 and moves to square 65

Player 1 on square 43 rolls a 2 and moves to square 45

Player 2 on square 50 rolls a 3 and moves to square 53

Player 3 on square 65 rolls a 4 and moves to square 69

Player 1 on square 45 rolls a 1 and moves to square 46

Player 2 on square 53 rolls a 4 and moves to square 57

Player 3 on square 69 rolls a 4 and moves to square 73

Player 1 on square 46 rolls a 3 and moves to square 49

Player 2 on square 57 rolls a 6 and moves to square 63
Yay! Landed on a ladder. Climb up to 81

Player 3 on square 73 rolls a 1 and moves to square 74

Player 1 on square 49 rolls a 2 and moves to square 51
Yay! Landed on a ladder. Climb up to 67

Player 2 on square 81 rolls a 4 and moves to square 85

Player 3 on square 74 rolls a 4 and moves to square 78

Player 1 on square 67 rolls a 3 and moves to square 70

Player 2 on square 85 rolls a 4 and moves to square 89

Player 3 on square 78 rolls a 4 and moves to square 82

Player 1 on square 70 rolls a 3 and moves to square 73

Player 2 on square 89 rolls a 3 and moves to square 92

Player 3 on square 82 rolls a 3 and moves to square 85

Player 1 on square 73 rolls a 3 and moves to square 76

Player 2 on square 92 rolls a 2 and moves to square 94

Player 3 on square 85 rolls a 5 and moves to square 90

Player 1 on square 76 rolls a 4 and moves to square 80

Player 2 on square 94 rolls a 6 and moves to square 100
Player 2 wins!


FreeBASIC[edit]

Translation of: Visual Basic .NET
Dim Shared As Integer SNL(1 To 16, 1 To 2) => {_
{ 4, 14}, { 9, 31}, {17,  7}, {20, 38}, {28, 84}, {40, 59}, {51, 67}, {54, 34}, _
{62, 19}, {63, 81}, {64, 60}, {71, 91}, {87, 24}, {93, 73}, {95, 75}, {99, 78}}

Randomize Timer

Const sixesThrowAgain = True

Function Turn(player As Integer, square As Integer) As Integer
    Do
        Dim As Integer roll = Int(Rnd * 6) + 1
        Print "Player"; player; ", on square"; square; ", rolls a"; roll;
        If square + roll > 100 Then
            Print " but cannot move."
        Else
            square += roll
            Print " and moves to square"; square
            If square = 100 Then Return 100 : End If
            
            Dim As Integer nxt = square
            If SNL(square, square) Then nxt = SNL(nxt, nxt) : End If
            If square < nxt Then
                Print "Yay! Landed on a ladder. Climb up to"; nxt; "."
                If nxt = 100 Then Return 100 : End If
                square = nxt
            Elseif square > nxt Then
                Print "Oops! Landed on a snake. Slither down to"; nxt; "."
                square = nxt
            End If
        End If
        
        If roll < 6 Orelse Not sixesThrowAgain Then Return square : End If
        Print "Rolled a 6 so roll again."
    Loop
End Function

Dim As Integer players(3) = {1, 1, 1}
Do
    For i As Integer = 1 To Ubound(players)
        Dim As Integer ns = Turn(i, players(i - 1))
        If ns = 100 Then
            Print "Player"; i; " wins!"
            Exit Do
        End If
        players(i - 1) = ns
        Print
    Next i
Loop
Sleep


Go[edit]

Translation of: Kotlin
package main

import (
    "fmt"
    "math/rand"
    "time"
)

var snl = map[int]int{
    4: 14, 9: 31, 17: 7, 20: 38, 28: 84, 40: 59, 51: 67, 54: 34,
    62: 19, 63: 81, 64: 60, 71: 91, 87: 24, 93: 73, 95: 75, 99: 78,
}

const sixThrowsAgain = true

func turn(player, square int) int {
    for {
        roll := 1 + rand.Intn(6)
        fmt.Printf("Player %d, on square %d, rolls a %d", player, square, roll)
        if square+roll > 100 {
            fmt.Println(" but cannot move.")
        } else {
            square += roll
            fmt.Printf(" and moves to square %d.\n", square)
            if square == 100 {
                return 100
            }
            next, ok := snl[square]
            if !ok {
                next = square
            }
            if square < next {
                fmt.Printf("Yay! Landed on a ladder. Climb up to %d.\n", next)
                if next == 100 {
                    return 100
                }
                square = next
            } else if square > next {
                fmt.Printf("Oops! Landed on a snake. Slither down to %d.\n", next)
                square = next
            }
        }
        if roll < 6 || !sixThrowsAgain {
            return square
        }
        fmt.Println("Rolled a 6 so roll again.")
    }
}

func main() {
    rand.Seed(time.Now().UnixNano())
    // three players starting on square one
    players := [3]int{1, 1, 1}
    for {
        for i, s := range players {
            ns := turn(i+1, s)
            if ns == 100 {
                fmt.Println("Player", i+1, "wins!")
                return
            }
            players[i] = ns
            fmt.Println()
        }
    }
}

Sample game:

Player 1, on square 1, rolls a 3 and moves to square 4.
Yay! Landed on a ladder. Climb up to 14.

Player 2, on square 1, rolls a 2 and moves to square 3.

Player 3, on square 1, rolls a 3 and moves to square 4.
Yay! Landed on a ladder. Climb up to 14.

Player 1, on square 14, rolls a 5 and moves to square 19.

Player 2, on square 3, rolls a 2 and moves to square 5.

Player 3, on square 14, rolls a 4 and moves to square 18.

Player 1, on square 19, rolls a 5 and moves to square 24.

Player 2, on square 5, rolls a 1 and moves to square 6.

Player 3, on square 18, rolls a 3 and moves to square 21.

Player 1, on square 24, rolls a 1 and moves to square 25.

Player 2, on square 6, rolls a 4 and moves to square 10.

Player 3, on square 21, rolls a 6 and moves to square 27.
Rolled a 6 so roll again.
Player 3, on square 27, rolls a 6 and moves to square 33.
Rolled a 6 so roll again.
Player 3, on square 33, rolls a 4 and moves to square 37.

Player 1, on square 25, rolls a 5 and moves to square 30.

Player 2, on square 10, rolls a 4 and moves to square 14.

Player 3, on square 37, rolls a 5 and moves to square 42.

Player 1, on square 30, rolls a 5 and moves to square 35.

Player 2, on square 14, rolls a 3 and moves to square 17.
Oops! Landed on a snake. Slither down to 7.

Player 3, on square 42, rolls a 5 and moves to square 47.

Player 1, on square 35, rolls a 5 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 2, on square 7, rolls a 5 and moves to square 12.

Player 3, on square 47, rolls a 6 and moves to square 53.
Rolled a 6 so roll again.
Player 3, on square 53, rolls a 6 and moves to square 59.
Rolled a 6 so roll again.
Player 3, on square 59, rolls a 3 and moves to square 62.
Oops! Landed on a snake. Slither down to 19.

Player 1, on square 59, rolls a 2 and moves to square 61.

Player 2, on square 12, rolls a 4 and moves to square 16.

Player 3, on square 19, rolls a 6 and moves to square 25.
Rolled a 6 so roll again.
Player 3, on square 25, rolls a 4 and moves to square 29.

Player 1, on square 61, rolls a 2 and moves to square 63.
Yay! Landed on a ladder. Climb up to 81.

Player 2, on square 16, rolls a 5 and moves to square 21.

Player 3, on square 29, rolls a 3 and moves to square 32.

Player 1, on square 81, rolls a 5 and moves to square 86.

Player 2, on square 21, rolls a 3 and moves to square 24.

Player 3, on square 32, rolls a 4 and moves to square 36.

Player 1, on square 86, rolls a 4 and moves to square 90.

Player 2, on square 24, rolls a 6 and moves to square 30.
Rolled a 6 so roll again.
Player 2, on square 30, rolls a 3 and moves to square 33.

Player 3, on square 36, rolls a 1 and moves to square 37.

Player 1, on square 90, rolls a 5 and moves to square 95.
Oops! Landed on a snake. Slither down to 75.

Player 2, on square 33, rolls a 1 and moves to square 34.

Player 3, on square 37, rolls a 3 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 1, on square 75, rolls a 5 and moves to square 80.

Player 2, on square 34, rolls a 5 and moves to square 39.

Player 3, on square 59, rolls a 3 and moves to square 62.
Oops! Landed on a snake. Slither down to 19.

Player 1, on square 80, rolls a 4 and moves to square 84.

Player 2, on square 39, rolls a 3 and moves to square 42.

Player 3, on square 19, rolls a 1 and moves to square 20.
Yay! Landed on a ladder. Climb up to 38.

Player 1, on square 84, rolls a 5 and moves to square 89.

Player 2, on square 42, rolls a 2 and moves to square 44.

Player 3, on square 38, rolls a 1 and moves to square 39.

Player 1, on square 89, rolls a 4 and moves to square 93.
Oops! Landed on a snake. Slither down to 73.

Player 2, on square 44, rolls a 4 and moves to square 48.

Player 3, on square 39, rolls a 1 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 1, on square 73, rolls a 3 and moves to square 76.

Player 2, on square 48, rolls a 2 and moves to square 50.

Player 3, on square 59, rolls a 1 and moves to square 60.

Player 1, on square 76, rolls a 2 and moves to square 78.

Player 2, on square 50, rolls a 2 and moves to square 52.

Player 3, on square 60, rolls a 4 and moves to square 64.
Oops! Landed on a snake. Slither down to 60.

Player 1, on square 78, rolls a 5 and moves to square 83.

Player 2, on square 52, rolls a 2 and moves to square 54.
Oops! Landed on a snake. Slither down to 34.

Player 3, on square 60, rolls a 4 and moves to square 64.
Oops! Landed on a snake. Slither down to 60.

Player 1, on square 83, rolls a 1 and moves to square 84.

Player 2, on square 34, rolls a 2 and moves to square 36.

Player 3, on square 60, rolls a 3 and moves to square 63.
Yay! Landed on a ladder. Climb up to 81.

Player 1, on square 84, rolls a 1 and moves to square 85.

Player 2, on square 36, rolls a 4 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 3, on square 81, rolls a 5 and moves to square 86.

Player 1, on square 85, rolls a 5 and moves to square 90.

Player 2, on square 59, rolls a 4 and moves to square 63.
Yay! Landed on a ladder. Climb up to 81.

Player 3, on square 86, rolls a 3 and moves to square 89.

Player 1, on square 90, rolls a 2 and moves to square 92.

Player 2, on square 81, rolls a 3 and moves to square 84.

Player 3, on square 89, rolls a 2 and moves to square 91.

Player 1, on square 92, rolls a 3 and moves to square 95.
Oops! Landed on a snake. Slither down to 75.

Player 2, on square 84, rolls a 2 and moves to square 86.

Player 3, on square 91, rolls a 6 and moves to square 97.
Rolled a 6 so roll again.
Player 3, on square 97, rolls a 3 and moves to square 100.
Player 3 wins!

J[edit]

Solution

As discussed in other implementations, this game is purely determined by chance and no user input is actually required.

The following game starts with players' counters off the board, an exact roll is not required to win and no additional dice roll results from throwing a six.

require 'format/printf general/misc/prompt'
SnakesLadders=:  _2 ]\ 4 14 9 31 17 7 20 38 28 84 40 59 51 67 54 34 62 19 63 81 64 60 71 91 87 24 93 73 95 75 99 78
'idx val'=:  |: SnakesLadders
Board=: val idx} i. >: 100               NB. representation of the board

rollDice=: 1 + $ ?@$ 6:                  NB. roll dice once for each player
playTurn=: Board {~ 100 <. rollDice + ]  NB. returns list of new posisitions given a list of starting positions

NB. Given the number of players, runs until one player reaches 100
runGame=: [: playTurn^:(100 -.@e. ])^:(<_) $&0

NB. Report player positions after each turn and result
report=: ('Player %d won!' sprintf 100 >:@i.~ {:) , echo

start=: >:@".@prompt&'How many players to play against?' [ echo bind 'You are Player 1!'
playSnakesLadders=: [: report@runGame start

Example Usage:

   playSnakesLadders''
You are Player 1!
How many players to play against?
4
 0  0  0   0  0
 5  5  5   5  6
 7 31 11   8  8
13 35 16  14 10
14 36  7  18 11
38 42 31  21 14
39 46 35  25 15
41 48 37  84  7
42 34 41  90  8
47 39 43  96 31
50 59 48  78 37
56 60 34  81 39
59 61 39  84 41
60 67 43  88 44
60 73 44  94 45
61 79 50 100 49
Player 4 won!

Java[edit]

import java.util.Map;
import java.util.Random;

public class Game {
    private static final Map<Integer, Integer> snl = Map.ofEntries(
        Map.entry(4, 14),
        Map.entry(9, 31),
        Map.entry(17, 7),
        Map.entry(20, 38),
        Map.entry(28, 84),
        Map.entry(40, 59),
        Map.entry(51, 67),
        Map.entry(54, 34),
        Map.entry(62, 19),
        Map.entry(63, 81),
        Map.entry(64, 60),
        Map.entry(71, 91),
        Map.entry(87, 24),
        Map.entry(93, 73),
        Map.entry(95, 75),
        Map.entry(99, 78)
    );
    private static final boolean sixesThrowAgain = true;
    private static Random rand = new Random();

    private static int turn(int player, int square) {
        int square2 = square;
        while (true) {
            int roll = rand.nextInt(6) + 1;
            System.out.printf("Player %d, on square %d, rolls a %d", player, square2, roll);
            if (square2 + roll > 100) {
                System.out.println(" but cannot move.");
            } else {
                square2 += roll;
                System.out.printf(" and moves to square %d\n", square2);
                if (square2 == 100) return 100;
                Integer next = snl.getOrDefault(square2, square2);
                if (square2 < next) {
                    System.out.printf("Yay! Landed on a ladder. Climb up to %d.\n", next);
                    if (next == 100) return 100;
                    square2 = next;
                } else if (square2 > next) {
                    System.out.printf("Oops! Landed on a snake. Slither down to %d.\n", next);
                    square2 = next;
                }
            }
            if (roll < 6 || !sixesThrowAgain) return square2;
            System.out.println("Rolled a 6 so roll again.");
        }
    }

    public static void main(String[] args) {
        // three players starting on square one
        int[] players = {1, 1, 1};
        while (true) {
            for (int i = 0; i < players.length; ++i) {
                int ns = turn(i + 1, players[i]);
                if (ns == 100) {
                    System.out.printf("Player %d wins!\n", i + 1);
                    return;
                }
                players[i] = ns;
                System.out.println();
            }
        }
    }
}

Julia[edit]

Translation of: Python

The game is pure chance, with a 2% advantage to going before the next player. See statistics below.

const landingtoending = Dict(4 => 14, 9 => 31, 17 => 7, 20 => 38, 28 => 84, 40 => 59,
    51 => 67, 54 => 34, 62 => 19, 63 => 81, 64 => 60, 71 => 91, 87 => 24, 93 => 73,
    95 => 75, 99 => 78)

const sixesrollagain = true

function takeaturn(player, square, verbose=true)
    while true
        roll = rand(1:6)
        verbose && print("Player $player on square $square rolls a $roll ")
        if square + roll > 100
            verbose && println(" but cannot move.")
        else
            square += roll
            verbose && println(" and moves to square $square.")
            if square == 100
                return 100
            end
            next = get(landingtoending, square, square)
            if square < next
                verbose && println("Yay! landed on a ladder. Climb up to $next.")
                if square == 100
                    return 100
                end
                square = next
            elseif square > next
                verbose && println("Oops! Landed on a snake chute. Slither down to $next.")
                square = next
            end
        end
        if roll < 6 || !sixesrollagain
            return square
        else
            verbose && println("Rolled a 6, so roll again.")
        end
    end
end

function snakesandladdersgame(nplayers, verbose=true)
    players = ones(Int, nplayers)
    while true
        for (player, position) in enumerate(players)
            ns = takeaturn(player, position, verbose)
            if ns == 100
                verbose && println("Player $player wins!")
                return player
            end
            players[player] = ns
            verbose && println()
        end
    end
end

snakesandladdersgame(3)

using DataFrames, GLM

function slstats(nplayers, ngames)
    players = zeros(Int, nplayers)
    for i in 1:ngames
        winner = snakesandladdersgame(nplayers, false)
        players[winner] += 1
    end
    println("\n\n\nStats: out of $ngames games, winners by order of play are:\n    #  |  wins \n----------------")
    for (i, player) in enumerate(players)
        println("    $i   $player")
    end
    data = DataFrame(X = collect(1:nplayers), Y = players)
    ols = lm(@formula(Y ~ X), data)
    println("\nStatistics:\n", ols)
end

slstats(5, 1000000)
Output:
Player 1 on square 1 rolls a 5  and moves to square 6.

Player 2 on square 1 rolls a 3  and moves to square 4.
Yay! landed on a ladder. Climb up to 14.

Player 3 on square 1 rolls a 5  and moves to square 6.

Player 1 on square 6 rolls a 1  and moves to square 7.

Player 2 on square 14 rolls a 5  and moves to square 19.

Player 3 on square 6 rolls a 5  and moves to square 11.

Player 1 on square 7 rolls a 2  and moves to square 9.
Yay! landed on a ladder. Climb up to 31.

Player 2 on square 19 rolls a 3  and moves to square 22.

Player 3 on square 11 rolls a 3  and moves to square 14.

Player 1 on square 31 rolls a 5  and moves to square 36.

Player 2 on square 22 rolls a 3  and moves to square 25.

Player 3 on square 14 rolls a 4  and moves to square 18.

Player 1 on square 36 rolls a 6  and moves to square 42.
Rolled a 6, so roll again.
Player 1 on square 42 rolls a 6  and moves to square 48.
Rolled a 6, so roll again.
Player 1 on square 48 rolls a 3  and moves to square 51.
Yay! landed on a ladder. Climb up to 67.

Player 2 on square 25 rolls a 2  and moves to square 27.

Player 3 on square 18 rolls a 3  and moves to square 21.

Player 1 on square 67 rolls a 1  and moves to square 68.

Player 2 on square 27 rolls a 1  and moves to square 28.
Yay! landed on a ladder. Climb up to 84.

Player 3 on square 21 rolls a 6  and moves to square 27.
Rolled a 6, so roll again.
Player 3 on square 27 rolls a 5  and moves to square 32.

Player 1 on square 68 rolls a 3  and moves to square 71.
Yay! landed on a ladder. Climb up to 91.

Player 2 on square 84 rolls a 5  and moves to square 89.

Player 3 on square 32 rolls a 2  and moves to square 34.

Player 1 on square 91 rolls a 6  and moves to square 97.
Rolled a 6, so roll again.
Player 1 on square 97 rolls a 5  but cannot move.

Player 2 on square 89 rolls a 4  and moves to square 93.
Oops! Landed on a snake chute. Slither down to 73.

Player 3 on square 34 rolls a 1  and moves to square 35.

Player 1 on square 97 rolls a 3  and moves to square 100.
Player 1 wins!



Stats: out of 1000000 games, winners by order of play are:
    #  |  wins
----------------
    1   208036
    2   204760
    3   199392
    4   195319
    5   192493

Statistics:
StatsModels.TableRegressionModel{LinearModel{GLM.LmResp{Array{Float64,1}},GLM.DensePredChol{Float64,LinearAlgebra.Cholesky{Float64,Array{Float64,2}}}},Array{Float64,2}}

Y ~ 1 + X

Coefficients:
──────────────────────────────────────────────────────────────────────────────────────
                  Estimate  Std. Error   t value  Pr(>|t|)    Lower 95%      Upper 95%
──────────────────────────────────────────────────────────────────────────────────────
(Intercept)      2.12158e5     772.519  274.632     <1e-6       2.097e5      2.14617e5
X            -4052.7           232.923  -17.3993    0.0004  -4793.97     -3311.43
──────────────────────────────────────────────────────────────────────────────────────

Kotlin[edit]

Translation of: D

This includes an option for the player to automatically roll again when a six is rolled which I believe is a common variation:

// version 1.2.0

import java.util.Random

val rand = Random()

val snl = mapOf(
     4 to 14,  9 to 31, 17 to  7, 20 to 38, 28 to 84, 40 to 59, 51 to 67, 54 to 34,
    62 to 19, 63 to 81, 64 to 60, 71 to 91, 87 to 24, 93 to 73, 95 to 75, 99 to 78
)

val sixThrowsAgain = true

fun turn(player: Int, square: Int): Int {
    var square2 = square
    while (true) {
        val roll = 1 + rand.nextInt(6)
        print("Player $player, on square $square2, rolls a $roll")
        if (square2 + roll > 100) {
            println(" but cannot move.")
        }
        else {
            square2 += roll
            println(" and moves to square $square2.")
            if (square2 == 100) return 100
            val next = snl.getOrDefault(square2, square2)
            if (square2 < next) {
                println("Yay! Landed on a ladder. Climb up to $next.")
                if (next == 100) return 100
                square2 = next
            }
            else if (square2 > next) {
                println("Oops! Landed on a snake. Slither down to $next.")
                square2 = next
            }
        }
        if (roll < 6 || !sixThrowsAgain) return square2
        println("Rolled a 6 so roll again.")
    }
}

fun main(args: Array<String>) {
    // three players starting on square one
    val players = intArrayOf(1, 1, 1)
    while (true) {
        for ((i, s) in players.withIndex()) {
            val ns = turn(i + 1, s)
            if (ns == 100) {
                println("Player ${i+1} wins!")
                return
            }
            players[i] = ns
            println()
        }
    }
}

Sample output:

Player 1, on square 1, rolls a 1 and moves to square 2.

Player 2, on square 1, rolls a 3 and moves to square 4.
Yay! Landed on a ladder. Climb up to 14.

Player 3, on square 1, rolls a 6 and moves to square 7.
Rolled a 6 so roll again.
Player 3, on square 7, rolls a 3 and moves to square 10.

Player 1, on square 2, rolls a 5 and moves to square 7.

Player 2, on square 14, rolls a 4 and moves to square 18.

Player 3, on square 10, rolls a 5 and moves to square 15.

Player 1, on square 7, rolls a 3 and moves to square 10.

Player 2, on square 18, rolls a 1 and moves to square 19.

Player 3, on square 15, rolls a 1 and moves to square 16.

Player 1, on square 10, rolls a 2 and moves to square 12.

Player 2, on square 19, rolls a 5 and moves to square 24.

Player 3, on square 16, rolls a 2 and moves to square 18.

Player 1, on square 12, rolls a 2 and moves to square 14.

Player 2, on square 24, rolls a 6 and moves to square 30.
Rolled a 6 so roll again.
Player 2, on square 30, rolls a 2 and moves to square 32.

Player 3, on square 18, rolls a 1 and moves to square 19.

Player 1, on square 14, rolls a 6 and moves to square 20.
Yay! Landed on a ladder. Climb up to 38.
Rolled a 6 so roll again.
Player 1, on square 38, rolls a 3 and moves to square 41.

Player 2, on square 32, rolls a 4 and moves to square 36.

Player 3, on square 19, rolls a 6 and moves to square 25.
Rolled a 6 so roll again.
Player 3, on square 25, rolls a 3 and moves to square 28.
Yay! Landed on a ladder. Climb up to 84.

Player 1, on square 41, rolls a 4 and moves to square 45.

Player 2, on square 36, rolls a 6 and moves to square 42.
Rolled a 6 so roll again.
Player 2, on square 42, rolls a 3 and moves to square 45.

Player 3, on square 84, rolls a 1 and moves to square 85.

Player 1, on square 45, rolls a 1 and moves to square 46.

Player 2, on square 45, rolls a 1 and moves to square 46.

Player 3, on square 85, rolls a 5 and moves to square 90.

Player 1, on square 46, rolls a 1 and moves to square 47.

Player 2, on square 46, rolls a 5 and moves to square 51.
Yay! Landed on a ladder. Climb up to 67.

Player 3, on square 90, rolls a 4 and moves to square 94.

Player 1, on square 47, rolls a 4 and moves to square 51.
Yay! Landed on a ladder. Climb up to 67.

Player 2, on square 67, rolls a 1 and moves to square 68.

Player 3, on square 94, rolls a 4 and moves to square 98.

Player 1, on square 67, rolls a 5 and moves to square 72.

Player 2, on square 68, rolls a 3 and moves to square 71.
Yay! Landed on a ladder. Climb up to 91.

Player 3, on square 98, rolls a 3 but cannot move.

Player 1, on square 72, rolls a 1 and moves to square 73.

Player 2, on square 91, rolls a 4 and moves to square 95.
Oops! Landed on a snake. Slither down to 75.

Player 3, on square 98, rolls a 6 but cannot move.
Rolled a 6 so roll again.
Player 3, on square 98, rolls a 6 but cannot move.
Rolled a 6 so roll again.
Player 3, on square 98, rolls a 2 and moves to square 100.
Player 3 wins!

Lua[edit]

Translation of: C
local sixesThrowAgain = true

function rollDice()
    return math.random(6)
end

function nextSquare(square)
    if square == 4 then
        return 14
    elseif square == 9 then
        return 31
    elseif square == 17 then
        return 7
    elseif square == 20 then
        return 38
    elseif square == 28 then
        return 84
    elseif square == 40 then
        return 59
    elseif square == 51 then
        return 67
    elseif square == 54 then
        return 34
    elseif square == 62 then
        return 19
    elseif square == 63 then
        return 81
    elseif square == 64 then
        return 60
    elseif square == 71 then
        return 91
    elseif square == 87 then
        return 24
    elseif square == 93 then
        return 73
    elseif square == 95 then
        return 75
    elseif square == 99 then
        return 78
    else
        return square
    end
end

function turn(player, square)
    while true do
        local roll = rollDice()
        io.write(string.format("Player %d, on square %d, rolls a %d", player, square, roll))
        if square + roll > 100 then
            io.write(" but cannot move.\n")
        else
            square = square + roll
            io.write(string.format(" and moves to square %d\n", square))
            if square == 100 then
                return 100
            end
            local nxt = nextSquare(square)
            if square < nxt then
                io.write(string.format("Yay! Landed on a ladder. Climb up to %d\n", square))
                square = nxt
            elseif nxt < square then
                io.write(string.format("Oops! Landed on a snake. Slither down to %d\n", square))
                square = nxt
            end
        end
        if roll < 6 or not sizexThrowAgain then
            return square
        end
        io.write("Rolled a 6 so roll again.\n")
    end
end

function main()
    local players = {1, 1, 1}

    while true do
        for i=1,3 do
            local ns = turn(i, players[i])
            if ns == 100 then
                io.write(string.format("Player %d wins!\n", i))
                return
            end
            players[i] = ns
            print()
        end
    end
end

main()

Modula-2[edit]

MODULE SnakeAndLadder;
FROM FormatString IMPORT FormatString;
FROM RandomNumbers IMPORT Random;
FROM Terminal IMPORT WriteString,WriteLn,ReadChar;

CONST SIXES_THROW_AGAIN = TRUE;

PROCEDURE NextSquare(sq : CARDINAL) : CARDINAL;
BEGIN
    (* Emulate a map for the ladders and snakes *)
    IF    sq =  4 THEN RETURN 14
    ELSIF sq =  9 THEN RETURN 31
    ELSIF sq = 17 THEN RETURN  7
    ELSIF sq = 20 THEN RETURN 38
    ELSIF sq = 28 THEN RETURN 84
    ELSIF sq = 40 THEN RETURN 59
    ELSIF sq = 51 THEN RETURN 67
    ELSIF sq = 54 THEN RETURN 34
    ELSIF sq = 62 THEN RETURN 19
    ELSIF sq = 63 THEN RETURN 81
    ELSIF sq = 64 THEN RETURN 60
    ELSIF sq = 71 THEN RETURN 91
    ELSIF sq = 87 THEN RETURN 24
    ELSIF sq = 93 THEN RETURN 73
    ELSIF sq = 95 THEN RETURN 75
    ELSIF sq = 99 THEN RETURN 78
    END;

    (* No snakes or ladders encountered *)
    RETURN sq
END NextSquare;

PROCEDURE Turn(player,square : CARDINAL) : CARDINAL;
VAR
    buf : ARRAY[0..63] OF CHAR;
    roll,next : CARDINAL;
BEGIN
    LOOP
        roll := Random(1,6);
        FormatString("Player %c, on square %c, rolls a %c", buf, player, square, roll);
        WriteString(buf);
        IF square + roll > 100 THEN
            WriteString(" but cannot move.");
            WriteLn
        ELSE
            square := square + roll;
            FormatString(" and moves to square %c\n", buf, square);
            WriteString(buf);
            IF square = 100 THEN RETURN 100 END;
            next := NextSquare(square);
            IF square < next THEN
                FormatString("Yay! Landed on a ladder. Climb up to %c.\n", buf, next);
                WriteString(buf);
                IF next = 100 THEN RETURN 100 END;
                square := next
            ELSIF square > next THEN
                FormatString("Oops! Landed on a snake. Slither down to %c.\n", buf, next);
                WriteString(buf);
                IF next = 100 THEN RETURN 100 END;
                square := next
            END
        END;
        IF (roll < 6) OR NOT SIXES_THROW_AGAIN THEN RETURN square END;
        WriteString("Rolled a 6 so roll again.");
        WriteLn
    END;

    RETURN square
END Turn;

(* Main *)
VAR
    buf : ARRAY[0..31] OF CHAR;
    players : ARRAY[0..2] OF CARDINAL;
    i,ns : CARDINAL;
BEGIN
    (* Initialize *)
    FOR i:=0 TO HIGH(players) DO
        players[i] := 1
    END;

    (* Game play *)
    LOOP
        FOR i:=0 TO HIGH(players) DO
            ns := Turn(i+1, players[i]);
            IF ns = 100 THEN
                FormatString("Player %c wins!\n", buf, i+1);
                WriteString(buf);
                EXIT
            END;
            players[i] := ns;
            WriteLn
        END
    END;

    ReadChar
END SnakeAndLadder.

Nim[edit]

Translation of: Kotlin
import random, sequtils, strformat, tables

const Snl = {4: 14, 9: 31, 17: 7, 20: 38, 28: 84, 40: 59, 51: 67, 54: 34,
             62: 19, 63: 81, 64: 60, 71: 91, 87: 24, 93: 73, 95: 75, 99: 78}.toTable

const SixThrowsAgain = true


proc turn(player, square: Positive): int =
  var square = square
  while true:
    let roll = rand(1..6)
    stdout.write &"Player {player}, on square {square}, rolls a {roll}"
    if square + roll > 100:
      echo " but cannot move."
    else:
      inc square, roll
      echo &" and moves to square {square}."
      if square == 100: return 100
      let next = Snl.getOrDefault(square, square)
      if square < next:
        echo &"Yay! Landed on a ladder. Climb up to {next}."
        if next == 100: return 100
        square = next
      elif square > next:
        echo &"Oops! Landed on a snake. Slither down to {next}."
        square = next
    if roll < 6 or not SixThrowsAgain: return square
    echo "Rolled a 6 so roll again."


proc playGame(n: Positive) =

    # "n" players starting on square one.
    var players = repeat(1, n)
    while true:
      for i, s in players:
        let ns = turn(i + 1, s)
        if ns == 100:
          echo &"Player {i+1} wins!"
          return
        players[i] = ns
        echo()

randomize()

when isMainModule:
  playGame(3)
Output:

Sample game.

Player 1, on square 1, rolls a 4 and moves to square 5.

Player 2, on square 1, rolls a 5 and moves to square 6.

Player 3, on square 1, rolls a 2 and moves to square 3.

Player 1, on square 5, rolls a 5 and moves to square 10.

Player 2, on square 6, rolls a 3 and moves to square 9.
Yay! Landed on a ladder. Climb up to 31.

Player 3, on square 3, rolls a 5 and moves to square 8.

Player 1, on square 10, rolls a 1 and moves to square 11.

Player 2, on square 31, rolls a 3 and moves to square 34.

Player 3, on square 8, rolls a 1 and moves to square 9.
Yay! Landed on a ladder. Climb up to 31.

Player 1, on square 11, rolls a 1 and moves to square 12.

Player 2, on square 34, rolls a 2 and moves to square 36.

Player 3, on square 31, rolls a 1 and moves to square 32.

Player 1, on square 12, rolls a 1 and moves to square 13.

Player 2, on square 36, rolls a 6 and moves to square 42.
Rolled a 6 so roll again.
Player 2, on square 42, rolls a 5 and moves to square 47.

Player 3, on square 32, rolls a 2 and moves to square 34.

Player 1, on square 13, rolls a 6 and moves to square 19.
Rolled a 6 so roll again.
Player 1, on square 19, rolls a 5 and moves to square 24.

Player 2, on square 47, rolls a 1 and moves to square 48.

Player 3, on square 34, rolls a 6 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.
Rolled a 6 so roll again.
Player 3, on square 59, rolls a 1 and moves to square 60.

Player 1, on square 24, rolls a 5 and moves to square 29.

Player 2, on square 48, rolls a 1 and moves to square 49.

Player 3, on square 60, rolls a 4 and moves to square 64.
Oops! Landed on a snake. Slither down to 60.

Player 1, on square 29, rolls a 1 and moves to square 30.

Player 2, on square 49, rolls a 2 and moves to square 51.
Yay! Landed on a ladder. Climb up to 67.

Player 3, on square 60, rolls a 6 and moves to square 66.
Rolled a 6 so roll again.
Player 3, on square 66, rolls a 5 and moves to square 71.
Yay! Landed on a ladder. Climb up to 91.

Player 1, on square 30, rolls a 1 and moves to square 31.

Player 2, on square 67, rolls a 5 and moves to square 72.

Player 3, on square 91, rolls a 3 and moves to square 94.

Player 1, on square 31, rolls a 3 and moves to square 34.

Player 2, on square 72, rolls a 1 and moves to square 73.

Player 3, on square 94, rolls a 2 and moves to square 96.

Player 1, on square 34, rolls a 6 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.
Rolled a 6 so roll again.
Player 1, on square 59, rolls a 2 and moves to square 61.

Player 2, on square 73, rolls a 2 and moves to square 75.

Player 3, on square 96, rolls a 4 and moves to square 100.
Player 3 wins!

Perl[edit]

Translation of: Raku
# board layout
my %snl =( 4, 14,  9, 31, 17,  7, 20, 38, 28, 84, 40, 59, 51, 67, 54, 34,
          62, 19, 63, 81, 64, 60, 71, 91, 87, 24, 93, 73, 95, 75, 99, 78);

@players = (1, 1, 1, 1); # 4 players, starting on square 1 (last player is human)

while () {
    for $player (0..$#players) {
       $turn_count++;
       turn(\$players[$player], $player + 1, $turn_count);
    }
}

sub turn {
    my($square, $player) = @_;
    if ($player == @players) { print "You are on square $$square. Hit enter to roll the die:"; <> }
    my $roll = 1 + int rand 6;
    my $turn = $$square + $roll;
    print "Player $player on square %2d rolls a $roll", $$square;
    if ($turn > 100) {
       print " but cannot move. Next players turn.\n";
       return
    }
    if ($snl{$turn}) {
        $$square = $snl{$turn};
        if ($turn > $$square) {
           print ". Oops! Landed on a snake. Slither down to $$square.\n"
        } else {
           print ". Yay! Landed on a ladder. Climb up to $$square.\n"
        }
    } else {
        $$square = $turn;
        print " and moves to square $$square\n";
    }
    if ($$square == 100) {print "Player $player wins after $turn_count turns.\n"; exit }
    return
}
Output:
Player 1 on square  1 rolls a 3. Yay! Landed on a ladder. Climb up to 14.
Player 2 on square  1 rolls a 1 and moves to square 2
Player 3 on square  1 rolls a 5 and moves to square 6
Player 4 on square  1 rolls a 4 and moves to square 5
Player 1 on square 14 rolls a 6. Yay! Landed on a ladder. Climb up to 38.
Player 2 on square  2 rolls a 2. Yay! Landed on a ladder. Climb up to 14.
Player 3 on square  6 rolls a 4 and moves to square 10
Player 4 on square  5 rolls a 3 and moves to square 8
... 703 turns omitted ...
Player 1 on square 83 rolls a 1 and moves to square 84
Player 2 on square 98 rolls a 2 and moves to square 100
Player 2 wins after 706 turns.

Phix[edit]

Translation of: C#
with javascript_semantics
constant sixesThrowAgain = true
 
constant snl = new_dict({{4,14},{9,31},{17,7},{20,38},{28,84},{40,59},{51,67},{54,34},
                        {62,19},{63,81},{64,60},{71,91},{87,24},{93,73},{95,75},{99,78}})
 
constant msgs = {". Oops! Landed on a snake. Slither down to %d.\n", -- (next<square)
                 " and moves to square %d\n",                        -- (next=square)
                 ". Yay! Landed on a ladder. Climb up to %d.\n"}     -- (next>square)
 
function Turn(integer player, square)
    while true do
        integer roll = rand(6)
        printf(1,"Player %d, on square %d, rolls a %d", {player, square, roll})
        if square+roll>100 then
            puts(1," but cannot move.\n")
        else
            square += roll
            integer next = getd(square,snl)
            if next=0 then next=square end if
            printf(1,msgs[compare(next,square)+2],next)
            square = next
            if square==100 then exit end if
        end if
        if roll<6 or not sixesThrowAgain then exit end if
        puts(1,"Rolled a 6 so roll again.\n")
    end while
    return square
end function
 
procedure main()
    sequence players = {1,1,1}  -- three players starting on square one
    while true do
        for i=1 to length(players) do
            players[i] = Turn(i, players[i])
            if players[i]==100 then
                printf(1,"Player %d wins!\n",i)
                return
            end if
        end for
    end while
end procedure
main()
Output:
Player 1, on square 1, rolls a 2 and moves to square 3
Player 2, on square 1, rolls a 1 and moves to square 2
Player 3, on square 1, rolls a 3. Yay! Landed on a ladder. Climb up to 14.
...
Player 3, on square 89, rolls a 5 and moves to square 94
Player 1, on square 90, rolls a 3. Oops! Landed on a snake. Slither down to 73.
Player 2, on square 97, rolls a 3 and moves to square 100
Player 2 wins!

PicoLisp[edit]

(seed (in "/dev/urandom" (rd 8)))
(setq *D
   '((4 14 T) (9 31 T) (17 7) (20 38 T)
      (28 84 T) (40 59 T) (51 67 T) (54 34)
      (62 19) (63 81 T) (64 60) (71 91 T)
      (87 24) (93 73) (95 75) (99 78) ) )
(de players (N)
   (make
      (for I N
         (let P (pack "Player " I)
            (set P 1)
            (link P) ) ) ) )
(de turn (P)
   (use D
      (loop
         (setq D (rand 1 6))
         (prin P " on square " (val P) ", rolls a " D)
         (if (> (+ (val P) D) 100)
            (prinl " but cannot move")
            (set P (+ (val P) D))
            (prinl " and move to square " (val P))
            (when (= (val P) 100)
               (prinl P " wins!")
               (throw 'win) )
            (when (assoc (val P) *D)
               (set P (cadr @))
               (if (cddr @)
                  (prinl "Yay! Landed on ladder. Climb up to " (val P))
                  (prinl "Ooops! Landed on snake. Slither down to " (val P)) ) ) )
         (T (> 6 D))
         (prinl "Rolled a 6 so roll again") ) ) )
(de main (N)
   (let P (players N)
      (catch 'win
         (loop
            (mapc turn P) ) ) ) )
(main 10)
Output:
Player 1 on square 1, rolls a 5 and move to square 6
Player 2 on square 1, rolls a 2 and move to square 3
Player 3 on square 1, rolls a 2 and move to square 3
Player 4 on square 1, rolls a 6 and move to square 7
Rolled a 6 so roll again
Player 4 on square 7, rolls a 5 and move to square 12
Player 5 on square 1, rolls a 3 and move to square 4
Yay! Landed on ladder. Climb up to 14
Player 6 on square 1, rolls a 4 and move to square 5
Player 7 on square 1, rolls a 1 and move to square 2
Player 8 on square 1, rolls a 4 and move to square 5
Player 9 on square 1, rolls a 1 and move to square 2
Player 10 on square 1, rolls a 2 and move to square 3
...
...
...
Ooops! Landed on snake. Slither down to 60
Rolled a 6 so roll again
Player 9 on square 60, rolls a 6 and move to square 66
Rolled a 6 so roll again
Player 9 on square 66, rolls a 2 and move to square 68
Player 10 on square 96, rolls a 4 and move to square 100
Player 10 wins!

Python[edit]

import random
import sys

snl = {
    4: 14,
    9: 31,
    17: 7,
    20: 38,
    28: 84,
    40: 59,
    51: 67,
    54: 34,
    62: 19,
    63: 81,
    64: 60,
    71: 91,
    87: 24,
    93: 73,
    95: 75,
    99: 78
}
sixesRollAgain = True

def turn(player, square):
    while True:
        roll = random.randint(1,6)
        sys.stdout.write("Player {0} on square {1}, rolls a {2}".format(player, square, roll))
        if square + roll > 100:
            print " but cannot move."
        else:
            square += roll
            print " and moves to square {0}".format(square)
            if square == 100:
                return 100
            next = snl.get(square, square)
            if square < next:
                print "Yay! landed on a ladder. Climb up to {0}.".format(next)
                if square == 100:
                    return 100
                square = next
            elif square > next:
                print "Oops! Landed on a snake. Slither down to {0}.".format(next)
                square = next
        if roll < 6 or not sixesRollAgain:
            return square
        print "Rolled a 6 so roll again."

def main():
    players = [1, 1, 1]
    while True:
        for i in range(0, 3):
            ns = turn(i+1, players[i])
            if ns == 100:
                print "Player {0} wins!".format(i+1)
                return
            players[i] = ns;
            print

main()

Racket[edit]

#lang racket/base

(define portals (hash  4 14  9 31  17 7  20 38  28 84  40 59  51 67  54 34  62 19  63 81  64 60  71 91  87 24  93 73  95 75  99 78))

(define (find-game-winner n-players reroll-on-six? (win values))
  (let turn ((positions-map (for/hash ((p n-players)) (values p 1))) (player 0))
    (newline)
    (let ((die (add1 (random 6)))
          (position (hash-ref positions-map player)))
      (printf "player ~a at ~a rolls ~a: " (add1 player) position die)
      (let* ((try-position (+ position die))
             (new-position
              (cond [(> try-position 100) (display "player can't move beyond the end.") position]
                    [(= try-position 100) (display "player wins!") try-position]
                    [(hash-ref portals try-position #f)
                     => (λ (slide-to)
                          (printf "~a from ~a to ~a." (if (> slide-to try-position) "LADDER" "SNAKE") try-position slide-to)
                          slide-to)]
                    [else (printf "landed on ~a." try-position) try-position])))
          (if (= new-position 100)
              (win (add1 player))
              (turn (hash-set positions-map player new-position)
                    (if (and (= 6 die) reroll-on-six?)
                        (begin0 player (display " [6] rolls again!"))
                        (modulo (add1 player) n-players))))))))

(module+ main
  (find-game-winner 5 #t (λ (p) (printf "~%~%The winner of the game is player #~a" p))))
Output:
player 1 at 1 rolls 2: landed on 3.
player 2 at 1 rolls 3: LADDER from 4 to 14.
player 3 at 1 rolls 6: landed on 7. [6] rolls again!
player 3 at 7 rolls 4: landed on 11.
player 4 at 1 rolls 3: LADDER from 4 to 14.
player 5 at 1 rolls 5: landed on 6.
player 1 at 3 rolls 1: LADDER from 4 to 14.
player 2 at 14 rolls 3: SNAKE from 17 to 7.
player 3 at 11 rolls 4: landed on 15.
...
player 3 at 86 rolls 5: landed on 91.
player 4 at 85 rolls 1: landed on 86.
player 5 at 68 rolls 6: landed on 74. [6] rolls again!
player 5 at 74 rolls 1: landed on 75.
player 1 at 59 rolls 1: landed on 60.
player 2 at 94 rolls 6: player wins!

The winner of the game is player #2

Raku[edit]

(formerly Perl 6)

Works with: Rakudo version 2017.01

Snakes and ladders is entirely chance based, so human interaction is not really required. This version allows up to one human player against any number of computer players and asks for input... but doesn't really need or even use it. I didn't bother to implement a graphical interface.

        # board layout
my %snl =  4, 14,  9, 31, 17,  7, 20, 38, 28, 84, 40, 59, 51, 67, 54, 34,
          62, 19, 63, 81, 64, 60, 71, 91, 87, 24, 93, 73, 95, 75, 99, 78;

my @players = 1, 1, 1; # three players, starting on square 1
my $human = 1;         # player 1 is human. set to 0 for all computer players

loop {
    for ^@players -> $player {
        turn(@players[$player], $player + 1);
    }
    say '';
}

sub turn ($square is rw, $player) {
    if $player == $human {
        prompt "You are on square $square. Hit enter to roll the die.";
    }
    my $roll = (1..6).roll;
    my $turn = $square + $roll;
    printf "Player $player on square %2d rolls a $roll", $square;
    if $turn > 100 {
        say " but cannot move. Next players turn.";
        return $square;
    }
    if %snl{$turn} {
        $square = %snl{$turn};
        if $turn > $square {
            say ". Oops! Landed on a snake. Slither down to $square."
        } else {
            say ". Yay! Landed on a ladder. Climb up to $square."
        }
    } else {
        $square = $turn;
        say " and moves to square $square";
    }
    say "Player $player wins!" and exit if $square == 100;
    return $square;
}
Sample output:
You are on square 1. Hit enter to roll the die.
Player 1 on square  1 rolls a 1 and moves to square 2
Player 2 on square  1 rolls a 4 and moves to square 5
Player 3 on square  1 rolls a 1 and moves to square 2

You are on square 2. Hit enter to roll the die.
Player 1 on square  2 rolls a 1 and moves to square 3
Player 2 on square  5 rolls a 2 and moves to square 7
Player 3 on square  2 rolls a 3 and moves to square 5

You are on square 3. Hit enter to roll the die.
Player 1 on square  3 rolls a 4 and moves to square 7
Player 2 on square  7 rolls a 1 and moves to square 8
Player 3 on square  5 rolls a 2 and moves to square 7

You are on square 7. Hit enter to roll the die.
Player 1 on square  7 rolls a 2. Yay! Landed on a ladder. Climb up to 31.
Player 2 on square  8 rolls a 3 and moves to square 11
Player 3 on square  7 rolls a 2. Yay! Landed on a ladder. Climb up to 31.

  ... about 15 turns omitted ...

You are on square 90. Hit enter to roll the die.
Player 1 on square 90 rolls a 3. Oops! Landed on a snake. Slither down to 73.
Player 2 on square 55 rolls a 3 and moves to square 58
Player 3 on square 90 rolls a 4 and moves to square 94

You are on square 73. Hit enter to roll the die.
Player 1 on square 73 rolls a 6 and moves to square 79
Player 2 on square 58 rolls a 5. Yay! Landed on a ladder. Climb up to 81.
Player 3 on square 94 rolls a 3 and moves to square 97

You are on square 79. Hit enter to roll the die.
Player 1 on square 79 rolls a 3 and moves to square 82
Player 2 on square 81 rolls a 6. Oops! Landed on a snake. Slither down to 24.
Player 3 on square 97 rolls a 5 but cannot move. Next players turn.

You are on square 82. Hit enter to roll the die.
Player 1 on square 82 rolls a 5. Oops! Landed on a snake. Slither down to 24.
Player 2 on square 24 rolls a 6 and moves to square 30
Player 3 on square 97 rolls a 4 but cannot move. Next players turn.

You are on square 24. Hit enter to roll the die.
Player 1 on square 24 rolls a 4. Yay! Landed on a ladder. Climb up to 84.
Player 2 on square 30 rolls a 5 and moves to square 35
Player 3 on square 97 rolls a 4 but cannot move. Next players turn.

You are on square 84. Hit enter to roll the die.
Player 1 on square 84 rolls a 1 and moves to square 85
Player 2 on square 35 rolls a 2 and moves to square 37
Player 3 on square 97 rolls a 3 and moves to square 100
Player 3 wins!

REXX[edit]

Translation of: D
/*REXX program plays  "Snakes and Ladders"  game for any number of players (default 3). */
parse arg np seed .                              /*obtain optional arguments from the CL*/
if np=='' | np==","  then np= 3                  /*Not specified?  Then use the default.*/
if datatype(seed, 'W')  then call random ,,seed  /*maybe use a seed for the  RANDOM BIF.*/
pad= left('',7)                                  /*variable value used for indenting SAY*/
                    do k=1  for 100;    @.k= k   /*assign default values for board cells*/
                    end   /*k*/                  /* [↑]  number when landing on a square*/
                                                 /* [↓]  define ladder destinations.    */
@.4=14;  @.9=31;    @.20=38;  @.28=84;  @.40=59;   @.51=67;   @.63=81;   @.71=91;  @.95=75
@.17=7;  @.54=34;   @.62=19;  @.64=60;  @.87=24;   @.93=73;   @.99=78
                                                 /* [↑]  define snake  destinations.    */
player.= 1                                       /*start all players on the 1st square. */
          do games=1  until $==100;           say center(' turn '   games" ",  75,  "─")
              do j=1  for np  until $==100;   $= turn(j, player.j);            player.j= $
              end   /*j*/                        /*process each of the number of players*/
          end       /*games*/                    /*exit both loops when there's a winner*/
say pad  'Player '       j       " wins!"        /*announce the winner; the game is over*/
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
turn: parse arg P, square;     ?= random(1, 6)   /*simulate a roll of a six─sided die.  */
      @does= pad  'Player '    P    " on square "    right(square, 2)     ' rolls a '    ?
      if square+?>100  then do;  say @does   " but can't move.  Next player's turn."
                                 return square
                            end
                       else do;  square= square + ?                     /*move a player.*/
                                 say @does   " and moves to square"     right(square, 3)
                            end
      next= @.square                                                    /*where moved to*/
      @oops=   pad  pad  'Oops!  Landed on a snake,  slither down to'   right(next, 3)
      @ladder= pad  pad   'Yay!  Landed on a ladder,  climb up to'      right(next, 3)
      if square<next  then                       say right(@ladder, 69)
                      else  if square>next then  say right(@oops  , 69)
      return next
output   when using the default input:
───────────────────────────────── turn  1 ─────────────────────────────────
        Player  1  on square   1  rolls a  5  and moves to square   6
        Player  2  on square   1  rolls a  3  and moves to square   4
                           Yay!  Landed on a ladder,  climb up to  14
        Player  3  on square   1  rolls a  5  and moves to square   6
───────────────────────────────── turn  2 ─────────────────────────────────
        Player  1  on square   6  rolls a  5  and moves to square  11
        Player  2  on square  14  rolls a  4  and moves to square  18
        Player  3  on square   6  rolls a  3  and moves to square   9
                           Yay!  Landed on a ladder,  climb up to  31
───────────────────────────────── turn  3 ─────────────────────────────────
        Player  1  on square  11  rolls a  6  and moves to square  17
                       Oops!  Landed on a snake,  slither down to   7
        Player  2  on square  18  rolls a  3  and moves to square  21
        Player  3  on square  31  rolls a  2  and moves to square  33
───────────────────────────────── turn  4 ─────────────────────────────────
        Player  1  on square   7  rolls a  5  and moves to square  12
        Player  2  on square  21  rolls a  4  and moves to square  25
        Player  3  on square  33  rolls a  3  and moves to square  36
───────────────────────────────── turn  5 ─────────────────────────────────
        Player  1  on square  12  rolls a  4  and moves to square  16
        Player  2  on square  25  rolls a  3  and moves to square  28
                           Yay!  Landed on a ladder,  climb up to  84
        Player  3  on square  36  rolls a  6  and moves to square  42
───────────────────────────────── turn  6 ─────────────────────────────────
        Player  1  on square  16  rolls a  6  and moves to square  22
        Player  2  on square  84  rolls a  1  and moves to square  85
        Player  3  on square  42  rolls a  3  and moves to square  45
───────────────────────────────── turn  7 ─────────────────────────────────
        Player  1  on square  22  rolls a  6  and moves to square  28
                           Yay!  Landed on a ladder,  climb up to  84
        Player  2  on square  85  rolls a  3  and moves to square  88
        Player  3  on square  45  rolls a  4  and moves to square  49
───────────────────────────────── turn  8 ─────────────────────────────────
        Player  1  on square  84  rolls a  4  and moves to square  88
        Player  2  on square  88  rolls a  6  and moves to square  94
        Player  3  on square  49  rolls a  1  and moves to square  50
───────────────────────────────── turn  9 ─────────────────────────────────
        Player  1  on square  88  rolls a  3  and moves to square  91
        Player  2  on square  94  rolls a  4  and moves to square  98
        Player  3  on square  50  rolls a  4  and moves to square  54
                       Oops!  Landed on a snake,  slither down to  34
──────────────────────────────── turn  10 ─────────────────────────────────
        Player  1  on square  91  rolls a  6  and moves to square  97
        Player  2  on square  98  rolls a  2  and moves to square 100
        Player  2  wins!

Ruby[edit]

NONE = 0; LADDER = 1; SNAKE = 2; STAY = 1; MOVE = 2; WIN = 3
class Cell
    @type; @to; attr_reader :type, :to
    def initialize; @type = NONE; @to = 0; end 
    def set( t, o ); @type = t; @to = o; end
end
class Player
    @pos; @name; attr_accessor :pos; attr_reader :name
    def initialize( n ); @pos = 0; @name = n; end
    def play( dice )
        s = dice.roll; return s, STAY if @pos + s > 99
        @pos += s; return s, WIN if @pos == 99
        return s, MOVE
    end
end
class Die
    @sides; def initialize( s = 6 ); @sides = s; end
    def roll; return 1 + rand( @sides ); end
end
def initBoard
    @board = Array.new( 100 ); for i in 0 .. 99; @board[i] = Cell.new(); end
    @board[3].set( LADDER, 13 ); @board[8].set( LADDER, 30 ); @board[19].set( LADDER, 37 );
    @board[27].set( LADDER, 83 );@board[39].set( LADDER, 58 ); @board[50].set( LADDER, 66 );
    @board[62].set( LADDER, 80 ); @board[70].set( LADDER, 90 ); @board[16].set( SNAKE, 6 );
    @board[61].set( SNAKE, 18 ); @board[86].set( SNAKE, 23 ); @board[53].set( SNAKE, 33 );
    @board[63].set( SNAKE, 59 ); @board[92].set( SNAKE, 72 ); @board[94].set( SNAKE, 74 ); 
    @board[98].set( SNAKE, 77 );
end
def initPlayers
    @players = Array.new( 4 );
    for i in 0 .. @playersCount - 1; @players[i] = Player.new( "player " << i + 49 ); end
end
def play
    initBoard; initPlayers; @die = Die.new
    while true
        for p in 0 .. @playersCount - 1
            puts; puts
            if( 0 == p ) 
                print "#{@players[p].name}, your turn. Your position is cell #{@players[p].pos + 1}.\n"<<
                "Press [RETURN] to roll the die."
                gets; np = @players[p].play( @die ); print "You rolled a #{np[0]}\n"
                if np[1] == WIN
                    print "You reached position #{@players[p].pos + 1} and win the game!!!!\n"; return
                elsif np[1] == STAY; print "Sorry, you cannot move!\n"
                else print "Your new position is cell #{@players[p].pos + 1}.\n";
                end
            else
                np = @players[p].play( @die ); print "#{@players[p].name} rolled a #{np[0]}.\n"
                if np[1] == WIN 
                     print "He reached position #{@players[p].pos + 1} and wins the game!!!!\n"; return
                elsif np[1] == STAY; print "But he cannot move....\n"
                else print "His new position is cell #{@players[p].pos + 1}.\n";
                end
            end
            s = @board[@players[p].pos].type
            next if s == NONE
            @players[p].pos = @board[@players[p].pos].to
            case s
                when SNAKE; print "What a pitty, landed on a snake. "
                when LADDER; print "Lucky move! Landed on a ladder. "
            end
            print "New position is cell #{@players[p].pos + 1}.\n"
        end
    end
end
@playersCount = 4; @board; @players; @die
play
Output:

... player 1, your turn. Your position is cell 97. Press [RETURN] to roll the die. You rolled a 5 Sorry, you cannot move!

player 2 rolled a 5. His new position is cell 49.

player 3 rolled a 4. But he cannot move....

player 4 rolled a 6. His new position is cell 91.

player 1, your turn. Your position is cell 97. Press [RETURN] to roll the die. You rolled a 3 You reached position 100 and win the game!!!!

Visual Basic .NET[edit]

Translation of: C#
Module Module1

    ReadOnly SNL As New Dictionary(Of Integer, Integer) From {
        {4, 14},
        {9, 31},
        {17, 7},
        {20, 38},
        {28, 84},
        {40, 59},
        {51, 67},
        {54, 34},
        {62, 19},
        {63, 81},
        {64, 60},
        {71, 91},
        {87, 24},
        {93, 73},
        {95, 75},
        {99, 78}
    }
    ReadOnly rand As New Random
    Const sixesThrowAgain = True

    Function Turn(player As Integer, square As Integer) As Integer
        Do
            Dim roll = rand.Next(1, 6)
            Console.Write("Player {0}, on square {1}, rolls a {2}", player, square, roll)
            If square + roll > 100 Then
                Console.WriteLine(" but cannot move.")
            Else
                square += roll
                Console.WriteLine(" and moves to square {0}", square)
                If square = 100 Then
                    Return 100
                End If

                Dim nxt = square
                If SNL.ContainsKey(square) Then
                    nxt = SNL(nxt)
                End If
                If square < nxt Then
                    Console.WriteLine("Yay! Landed on a ladder. Climb up to {0}.", nxt)
                    If nxt = 100 Then
                        Return 100
                    End If
                    square = nxt
                ElseIf square > nxt Then
                    Console.WriteLine("Oops! Landed on a snake. Slither down to {0}.", nxt)
                    square = nxt
                End If
            End If

            If roll < 6 OrElse Not sixesThrowAgain Then
                Return square
            End If
            Console.WriteLine("Rolled a 6 so roll again.")
        Loop
    End Function

    Sub Main()
        Dim players = {1, 1, 1}
        Do
            For i = 1 To players.Length
                Dim ns = Turn(i, players(i - 1))
                If ns = 100 Then
                    Console.WriteLine("Player {0} wins!", i)
                    Return
                End If
                players(i - 1) = ns
                Console.WriteLine()
            Next
        Loop
    End Sub

End Module

Wren[edit]

Translation of: Kotlin
import "random" for Random

var rand = Random.new()

var snl = {
     4: 14,  9: 31, 17:  7, 20: 38, 28: 84, 40: 59, 51: 67, 54: 34,
    62: 19, 63: 81, 64: 60, 71: 91, 87: 24, 93: 73, 95: 75, 99: 78
}

var sixThrowsAgain = true

var turn = Fn.new { |player, square|
    while (true) {
        var roll = 1 + rand.int(6)
        System.write("Player %(player), on square %(square), rolls a %(roll)")
        if (square + roll > 100) {
            System.print(" but cannot move.")
        } else {
            square = square + roll
            System.print(" and moves to square %(square).")
            if (square == 100) return 100
            var next = snl[square]
            if (!next) next = square
            if (square < next) {
                System.print("Yay! Landed on a ladder. Climb up to %(next).")
                if (next == 100) return 100
                square = next
            } else if (square > next) {
                System.print("Oops! Landed on a snake. Slither down to %(next).")
                square = next
            }
        }
        if (roll < 6 || !sixThrowsAgain) return square
        System.print("Rolled a 6 so roll again.")
    }
}

// three players starting on square one
var players = [1, 1, 1]
while (true) {
    var i = 0
    for (s in players) {
        var ns = turn.call(i + 1, s)
        if (ns == 100) {
            System.print("Player %(i+1) wins!")
            return
        }
        players[i] = ns
        System.print()
        i = i + 1
    }
}
Output:

Sample game (abridged):

Player 1, on square 1, rolls a 6 and moves to square 7.
Rolled a 6 so roll again.
Player 1, on square 7, rolls a 6 and moves to square 13.
Rolled a 6 so roll again.
Player 1, on square 13, rolls a 5 and moves to square 18.

Player 2, on square 1, rolls a 2 and moves to square 3.

Player 3, on square 1, rolls a 5 and moves to square 6.

Player 1, on square 18, rolls a 6 and moves to square 24.
Rolled a 6 so roll again.
Player 1, on square 24, rolls a 4 and moves to square 28.
Yay! Landed on a ladder. Climb up to 84.

Player 2, on square 3, rolls a 4 and moves to square 7.

Player 3, on square 6, rolls a 2 and moves to square 8.

Player 1, on square 84, rolls a 6 and moves to square 90.
Rolled a 6 so roll again.
Player 1, on square 90, rolls a 5 and moves to square 95.
Oops! Landed on a snake. Slither down to 75.

....

Player 2, on square 53, rolls a 3 and moves to square 56.

Player 3, on square 92, rolls a 4 and moves to square 96.

Player 1, on square 39, rolls a 1 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 2, on square 56, rolls a 3 and moves to square 59.

Player 3, on square 96, rolls a 4 and moves to square 100.
Player 3 wins!

Yabasic[edit]

// Rosetta Code problem: http://rosettacode.org/wiki/Snake_and_Ladder
// by Galileo, 04/2022

data 4, 14, 9, 31, 17, 7, 20, 38, 28, 84, 40, 59, 51, 67, 54, 34, 62, 19, 63, 81, 64, 60, 71, 91, 87, 24, 93, 73, 95, 75, 99, 78

dim table(100), player(2)

for n = 1 to 16 : read o, d : table(o) = d : next
player(1) = 1 : player(2) = 1
 
turn = 1

do
    steps = int(ran(6)) + 1
    nextPos = player(turn) + steps
    print "Player ", turn, " on square ", player(turn), " rolls a ", steps;
    if not (nextPos > 100) then
        print " and moves to square ", nextPos, "."
        player(turn) = nextPos
        if nextPos = 100 print "Player ", turn, " wins!" : break
        if table(nextPos) then
            player(turn) = table(nextPos)
            if table(nextPos) > nextPos then
                print "Yay! Landed on a ladder. Climb up to ";
            else
                print "Oops! Landed on a snake. Slither down to ";
            end if
            print player(turn), "."
        end if
    else
        print " but cannot move."
    end if
    if steps = 6 then
        print "Rolled a 6, so roll again."
    else
        turn = turn + 1 : if turn > 2 turn = 1
    end if
    print
loop
Output:
Player 1 on square 1 rolls a 4 and moves to square 5.

Player 2 on square 1 rolls a 3 and moves to square 4.
Yay! Landed on a ladder. Climb up to 14.

Player 1 on square 5 rolls a 4 and moves to square 9.
Yay! Landed on a ladder. Climb up to 31.

Player 2 on square 14 rolls a 2 and moves to square 16.

Player 1 on square 31 rolls a 6 and moves to square 37.
Rolled a 6, so roll again.

Player 1 on square 37 rolls a 3 and moves to square 40.
Yay! Landed on a ladder. Climb up to 59.

Player 2 on square 16 rolls a 5 and moves to square 21.

Player 1 on square 59 rolls a 1 and moves to square 60.

Player 2 on square 21 rolls a 6 and moves to square 27.
Rolled a 6, so roll again.

Player 2 on square 27 rolls a 1 and moves to square 28.
Yay! Landed on a ladder. Climb up to 84.

Player 1 on square 60 rolls a 4 and moves to square 64.
Oops! Landed on a snake. Slither down to 60.

Player 2 on square 84 rolls a 1 and moves to square 85.

Player 1 on square 60 rolls a 2 and moves to square 62.
Oops! Landed on a snake. Slither down to 19.

Player 2 on square 85 rolls a 4 and moves to square 89.

Player 1 on square 19 rolls a 1 and moves to square 20.
Yay! Landed on a ladder. Climb up to 38.

Player 2 on square 89 rolls a 3 and moves to square 92.

Player 1 on square 38 rolls a 6 and moves to square 44.
Rolled a 6, so roll again.

Player 1 on square 44 rolls a 5 and moves to square 49.

Player 2 on square 92 rolls a 4 and moves to square 96.

Player 1 on square 49 rolls a 2 and moves to square 51.
Yay! Landed on a ladder. Climb up to 67.

Player 2 on square 96 rolls a 5 but cannot move.

Player 1 on square 67 rolls a 6 and moves to square 73.
Rolled a 6, so roll again.

Player 1 on square 73 rolls a 3 and moves to square 76.

Player 2 on square 96 rolls a 6 but cannot move.
Rolled a 6, so roll again.

Player 2 on square 96 rolls a 4 and moves to square 100.
Player 2 wins!
---Program done, press RETURN---