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

Book
Mefferts Challenge - ImpossiballGuide book sold with the Impossiball by Mefferts
Mefferts Challenge - MegaminxGuide book sold with the megaminx by Mefferts
Mefferts Challenge - Skewb UltimateGuide book sold with the skewb ultimate by Mefferts

Megaminx (book)The elementary strategy, with two types of operations only.
Mickey's ChallengePromo comic booklet for Mickey's Challenge.

Mickey's Challenge Guide bookSolution booklet sold together with the spherical skewb
Not Another Cube Book (Ballantine)Dedicated to the notion of a cube-free world




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