Download or play online:
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Simon Tatham's Portable Puzzle Collection
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This page contains a collection of small computer programs which implement one-player puzzle games. All of them run natively on Unix (GTK), on Windows, and on Mac OS X; they can also be played on the web, as Java applets.
Pix + text: http://www.chiark.greenend.org.uk/~sgtatham/puzzles/
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graylox