Online since 2002. The most comprehensive site for all around twisty puzzles.
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Igor Goldman
Disk PuzzleSimilar to other tricky disky puzzles with 6 coloured half-cylinders in 2 layers, 6 columns.
Einstein's CrystalTwelve pieces turnable by 180� with four colours in shape of the first stellation of a rhombic dodecahedron, also known as Escher solid.
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