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

Dr. Vojtech Kopsky, Dr. Harel Hrsel
Cube 21 - Limited EditionThis Cube 21 shows only one sort of stickers. Solving the shape is all to be done.
Cube 21 - Original EditionEuropean version of the Square-1.
Cube 21 - Silver EditionThis Cube 21 only has 2 colours, one of which is always silver.

Get back to Square-1An american based version of the Square-1. It distinguishes itself from the other variants because it was sold in scrambled state.
MF8 Square-1MF8s version from 2007. Produced in five different colors.
Mega ChallengerAnother mass produced variant of Square-1

Square-1The logo on this version is written in a different font.
Square-1 (mono coloured)A Square-1 that is solved by shape only.

Super CubixVirtually (if not exactly) identical to the orignial Square-1.

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