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

Guido Lap
Brainstring AdvancedAn improved design and an additional set of strings set this version apart from the original.
Brainstring OriginalTwelve elastic strings are moved around within a transparent cube.
Brainstring RThe third puzzle named "Brainstring". A minimal twist with elastic string within it.

CrossteaserRotate color wheels into the open space to move.

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