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Ultimate ChimeraThe concept of the Chimera cube extended to a 12x12x12.
Ultimate GigaminxA sticker variant of the Gigaminx.
Ultimate Helicopter CubeAn Ultimate Helicopter Cube. The stickers are handmade in the style used first for the Ultimate Cube.

Ultimate MegaminxA sticker variant of the megaminx adapted from the Ultimate Cube
UltimatestarA compound of Ultimate Skewb (hence the name) and Icosahedron Skewb.
Ultra-XThe first puzzle which implements three axis systems in one.

UltraMorph EggA 5x5x5 transformed into an egg oriented from corner to corner.
UltramorphixA 5x5x5 modified into a truly tetrahedral shape.
UltraxisAn axises 5x5x5.

Unbandaged 4x4x4 Mixup Plus CubeAn unbandaged variation of Witeden's ''4x4x4 Mixup Plus Cube''.
Undecaemperor tharsis cuboid 37-layer brickA hexahedral relative of the 18x19x37 tharsis.
Unicorn 2x2x2The Unicorn implemented with a 2x2x2 instead of a 3x3x3.

Unique-1A truncated and extended 3x3x3. The cuts are placed arbitrary by purpose.
Unique-2A truncated and extended 3x3x3 without any kind of symmetry or regularity.
Unique-3A skewb in a convex but random shape with twelve sides.


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