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This scenario is the basis for an entertaining and challenging puzzle called TipOver, made by ThinkFun. Last year, Games magazine named it &quot,
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uzzle of the year" for 2005.
TipOver started out as an online game invented by James W,
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. Stephens of Atlanta. It's featured on his PuzzleBeast Web site at
http://www.puzzlebeast.com/ as the "Kung Fu Packing Crate Maze.&quot,
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; Puzzle inventor M. Oskar van Deventer created the mechanical version sold by ThinkFun.
Robert A. Hearn, a graduate student in the Artificial Intelligence Lab at the Massachusetts Institute of Technology,
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, has had a longstanding interest in the connection between combinatorial games and computation. He has proved a variety of results related to computational complexity for sliding-block puzzles, sliding-coin puzzles, plank puzzles, hinged polygon dissections, Amazons,
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, Konane, Cross Purposes, and others. He has also strengthened existing results or provided new, simpler proofs of complexity for games such as Minesweeper, the Warehouseman's Problem,
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, Sokoban, and Rush Hour. Hearn completed his doctoral thesis on "Games, Puzzles, and Computation" last spring.
In the case of TipOver,

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