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

Mini void 3x9x15 soap barA balloid/ellipsoid in 3 dimensions.
Overlapping 3x3x5A 3x3x4 (which is based on a 3x3x5) is modified like the Overlapping 4x4x4 was made out of a mass produced 4x4x4.
Professor Mental FlopThe fourth mental flop, built up from a 3x3x5.

Proportional mirror 3x3x5 cuboidA Mirror (aka Bump) 3x3x5 with proportional pieces in the middle layers.
WitEden Super 3x3x3A 3x3x3 with circles on yellow and white faces. These faces can only be moved when the circles are restored.

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