Online since 2002. The most comprehensive site for all around twisty puzzles with 13768 puzzles, 5433 members and 429105 posts to 39567 topics.

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Group the wooden balls on both oval tracks.
Group the wooden balls on both oval tracks.
A cuboctahedron for which all fourteen faces can turn with identical cut depths under each face.
A cuboctahedron for which all fourteen faces can turn with identical cut depths under each face.
A slightly curved and rather deeply cut edge turning dodecahedron.
A slightly curved and rather deeply cut edge turning dodecahedron.
A mass-produced 3x3x3 with one circle of 16 marbles per side.
A mass-produced 3x3x3 with one circle of 16 marbles per side.
Two circles rotating in steps of 90° with an intersection smaller than the radius of the circles.
Two circles rotating in steps of 90° with an intersection smaller than the radius of the circles.

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Miguel's Collection, SoulVendor's Puzzles, My Puzzles Collection, Deus Cubes Collection, Kasmca's Puzzle Collection, TestCollection, AlexWan’s collection

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