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Microsoft® Silverlight® Edition: Programming Windows® Phone 7 by Charles Petzold

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Images and Tombstoning

In the 1890s, American puzzle-make Sam Loyd popularized a puzzle that was invented a couple decades earlier and has since come to be known as the 15 Puzzle, or the 14-15 Puzzle, or (in France) Jeu de Taquin, the “teasing game.” In its classic form, the puzzle consists of 15 tiles labeled 1 through 15 arranged randomly in a 4x4 grid, leaving one blank tile. The goal is to shift the tiles around so the numbers are sequential.

In computer form, this puzzle was one of the first game programs created for the Apple Macintosh, where it was called PUZZLE. A Windows version appeared in early versions of the Microsoft Windows Software Development Kit (SDK) under the name MUZZLE, where it was the only sample program in the SDK coded ...

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