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

Six-Sided: Cube (Shape Changing)
Twisted Thomas CubeThomas cube 2x2x2 with a slight twist.
Twisty BurrA puzzle consisting of an inner 2x2x2 puzzle, and an outer shell burr puzzle.
Twisty Slidy CubeSeems to be a 2x2x4 but it allows the move of Sliding Pucks.

Two solutions Mirror BlocksA sticker variant of the Mirror Block puzzle which leads into a puzzle with two solutions.
UltraxisAn axises 5x5x5.
Unaxis Slim TowerA 2x2x3 (aka Slim Tower) in a cubic shape, tilted inside the solid.

Unbandaged 4x4x4 Mixup Plus CubeAn unbandaged variation of Witeden's ''4x4x4 Mixup Plus Cube''.
Unbandaged Helicopter CubeA Helicopter cube with internal modification which allows more movements.
Unbandaged Helicopter SkewbThe Helicopter Skewb with another design feature that increases the difficulty even further.

Unbandaged Square-1A Square-1 which was complete unbandaged. The result is a prism with twelve segments and three layers.
Uncanny CubeA semi-cubic twisty puzzle with only five turning faces.
Uncanny MixupA puzzle combining the concepts of Mixup Cube and Uncanny Cube.

Unequal Fisher CubeA fully bumped Fisher Cube.
Unequal WindmillA Windmill Cube bumped on all three axes.
V-CubeA Ufo transformed in hexahedral shape.


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