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

Irwin Toys Limited
Get back to Square-1An american based version of the Square-1. It distinguishes itself from the other variants because it was sold in scrambled state.
Get back to SunsquareThe japanese version of "Get back to Square-1"
LockoutA puzzle lock, an interesting combination between a logic game and a sliding tile game.

Mega ChallengerAnother version of Square-1

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