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 </lang>
+=={{header|PicoLisp}}==
+<lang PicoLisp>(load "@lib/simul.l")
+(seed (in "/dev/urandom" (rd 8)))
+(setq *G (grid 4 4)  *D NIL)
+(de cell ()
+   (use This
+      (while
+         (get
+            (setq This
+               (intern
+                  (pack
+                     (char (+ 96 (rand 1 4)))
+                     (rand 1 4) ) ) )
+            'N ) )
+      (=: N (if (> 90 (rand 1 100)) 2 4) ) )
+   (setq *D (fish '((This) (: N)) *G)) )
+(de redraw (G S D)
+   # zeroize *G
+   (mapc
+      '((I)
+         (mapc '((This) (=: N NIL)) I) )
+      *G )
+   # draw again
+   (mapc
+      '((X This)
+         (while (and This X)
+            (=: N (pop 'X))
+            (setq This (D This)) ) )
+      G
+      S ) )
+(de summ (Lst)
+   (mapcar
+      '((L)
+         (make
+            (while L
+               (ifn (= (car L) (cadr L))
+                  (link (car L))
+                  (link (+ (car L) (cadr L)))
+                  (pop 'L) )
+               (pop 'L) ) ) )
+      Lst ) )
+(de vertical ()
+   (mapcar
+      '((X) (extract '((This) (: N)) X))
+      *G ) )
+(de horizontal ()
+   (mapcar
+      '((This)
+         (make
+            (while This
+               (when (: N) (link @))
+               (setq This (east This)) ) ) )
+      (car *G) ) )
+(de finish? ()
+   (nor
+      (fish
+         '((This)
+            (when (atom This) (= NIL (: N))) )
+         *G )
+      (find
+         '((L)
+            (find
+               '((This)
+                  (when (: N)
+                     (find
+                        '((D)
+                           (= (: N) (get (D This) 'N)) )
+                        (quote north south west east) ) ) )
+               L ) )
+         *G ) ) )
+(de board (D)
+   (space 3)
+   (prin '+)
+   (for I G
+      (prin (if (D (car I)) "   +" "---+")) )
+   (prinl) )
+(de display ()
+   (let G (mapcar reverse *G)
+      (board north)
+      (while (caar G)
+         (space 3)
+         (prin '|)
+         (for I G
+            (with (car I)
+               (prin
+                  (if (: N) (align 3 (: N)) "   ")
+                  (if (east This) " " '|) ) ) )
+         (prinl)
+         (board south)
+         (map pop G) )
+      (do 2
+         (prinl) ) ) )
+(do 2
+   (cell) )
+(display)
+(loop
+   (case
+      (pack
+         (make
+            (link (key))
+            (while (key 100)
+               (link @) ) ) )
+      ("^[[D" #left
+         (redraw (summ (horizontal)) '(a1 a2 a3 a4) east) )
+      ("^[[C" #rigth
+         (redraw
+            (summ (mapcar reverse (horizontal)))
+            '(d1 d2 d3 d4)
+            west) )
+      ("^[[B" #down
+         (redraw (summ (vertical)) '(a1 b1 c1 d1) north) )
+      ("^[[A" #up
+         (redraw
+            (summ (mapcar reverse (vertical)))
+            '(a4 b4 c4 d4)
+            south) ) )
+   (when (diff *D (fish '((This) (: N)) *G))
+      (cell) )
+   (display)
+   (T (finish?) (println 'Finish))
+   (T (fish '((This) (= 512 (: N))) *G)
+      (println 'Maximum) ) )
+(bye)</lang>
 =={{header|Python}}==