Online since 2002. The most comprehensive site for all around twisty puzzles.

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.

Rubik's Cube badgesSix badges made by David Singmaster during the original cube craze.

Singmaster's pinsA series of pin which were designed and distributed by David Singmaster during the original cube craze.

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