src="https://www.sciencenews.org/article/complexity-tipover-and-other-puzzles" title="~~ ThinkFun" class="caption" style="width: 300px; float: right;" />
[img]https://www.sciencenews.org/article/complexity-tipover-and-other-puzzles[/img]
This scenario is the basis for an entertaining and challenging puzzle called TipOver, made by ThinkFun. Last year, Games magazine named it "puzzle of the year" for 2005.
TipOver started out as an online game invented by James W. Stephens of Atlanta. It's featured on his PuzzleBeast Web site at
http://www.puzzlebeast.com/ as the "Kung Fu Packing Crate Maze,
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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, 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,
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, sliding-coin puzzles, plank puzzles, hinged polygon dissections,
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, 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,
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, and Rush Hour. Hearn completed his doctoral thesis on "Games,
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, Puzzles, and Computation" last spring.
In the case of TipOver,
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