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Six-Sided: Cuboid
Master Mental FlopA Mental Flop enhanced by one layer.
Master QuartetThe bigger cousin of the Quartet with two layers on each side.
Mental BlockToday this can be considered as one of Tony Fisher's classical Skewb modifications.

Mental BoxA truncated Container or less extended Mental Block.
Messed Up Bump 2x2x4A 2x2x4 that was scrambled and brought back into cubic shape.
Micro 1x2x3A 1x2x3 with 6 mm cubies, making it the smallest ever made.

Micro 2x2x3A 2x2x3 handmade from a 19 mm Micro Rubiks cube.
Mini 2x3x3 wannabeA simple modification of a 2x2x2 done by extending the pieces so that it appears to be a 2x3x3.
Mini Time machine Made from a mass produced 2x2x3 cuboid.

Mirror WallA bandaged Mirror Blocks with extensions.
Mixup 2x3x3A 2x3x3 which allows Mixup moves.
Mixup 3x3x4Another Mixup puzzle by the (re-)inventor of the Mixup Cube. This time a 3x3x4 was "mixed up".

Mosaic BlockA cuboid, but a corner-turning one.
N-CubeA 3x3x4 with some external pieces truncated and internal pieces stickered.
Non-straight 1x1x6A 1x1x6 with the pieces attached by 90°


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