Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

David Singmaster
Cubic CircularA very informative collection of twisty puzzle-related articles assembled by David Singmaster.
Kanttekeningen bij de kubus van RubikA Dutch book on Rubik's cube explaining the mathematical principles, not for the beginners.

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Magic 16
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Rubik's 360
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