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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 colors, one of which is always silver.

Mega ChallengerAnother mass produced variant of Square-1
MF8 Square-1MF8s version from 2007. Produced in five different colors.
Square-1The logo on this version is written in a different font.

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