Online since 2002. The most comprehensive site for all around twisty puzzles.
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Choong Myoung Lee
LimitationA 3x3x3 which implements another concept of contraining the movements.The effect is similar to the constrained cube but the restrictions are variable. 
Troll CubeA sticker variant that works like a Super 3x3x3 and is always solvable after arbitrary reassembling.
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