There are differences between the XSokoban layout, used by this program, and the mazes found in a few other versions of the game.  I wonder which layout was originally used in 1982, but in order to allow comparison between the player's results and the top scores found on http://xsokoban.lcs.mit.edu/~andru/xsokoban/, I had to use the same level layout as the one used by XSokoban anyway. 

To let you try the different versions, files var12/20/25/37/42/50.xsb contain the layout variants of levels 12, 20, 25, 37, 42 and 50. 

Note: These levels are copyright Thinking Rabbit Inc. Japan.
