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Dr. Vojtech Kopsky, Dr. Harel Hrsel
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. The second colour can be any of the other five Original Edition colours: blue, orange, green, yellow, red.
Square-1The 1994 Irwin Toys version.
Square-1The logo on this version is written in a different font.
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Square-1 Mechanism
