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Udo Krell
Professor Cube (grooved tiles)Meffert's 1998 tiled version.
Professor Cube (no white side)Professor Cube. Invented by Udo Krell. This one has no white side. Produced in Hong Kong.

Rubik's 5x5x52002 Rubiks.com edition.
Rubik's Studio 5x5x5The new retooled version of Rubik's Revenge produced in Hungary by Rubik's Studio

Rubik's Studio 5x5x5 (Japanese edition)The new retooled version of Rubik's Wahn produced in China under license of SevenTowns
Rubik's WahnEarly Arxon version.

Ultimate, Rubik's Wahn, Master RevengeInvented by Udo Krell. Produced in Hong Kong.

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