Sokoban (Simonsnake)

Simon's Sokoban Game.  The game contains 50 levels (encoded into data statements).

Anyone could design their own level sets which could be MERGEd into the game (if they work out the encoding which isn't that difficult to do).
It's a bit slow to draw the levels, but that's only a small issue.

Update:  New version with full UNDO facility.