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

Erno Rubik, Tamás Varga, Gerzson Kéri, György Marx and Tamás Vekerdy
Rubik's Cubic CompendiumRecreations in Mathematics

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Professor Pyraminx
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Turbo Mind Twister
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Rubik's 360
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