Sliding Block Puzzle for DOS (2011 Loren Blaney) This freeware game is a simple Sliding Block Puzzle. While a game, its primary purpose is as a progamming example for the intriguing XPL0 Programming Language. Solve it yourself, or study the computer A.I. as it solves the puzzle for you. The inlcuded source code describes tricks for doing high-speed graphics. NOTE: 286+ PC and 640x480 VGA required, mouse optional.