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A new challenge to the Square-1 / Cube 21.
This Square-1 with four layers was first presented on the forum in 2007. One year later mass production began.
This puzzle was a case of parallel invention. James Lee is one of at least two. The other inventor is so far unrevealed.
It is sold with black, white and primary glow-in-dark body color.
Edge length: 57 mm
Weight: 115 grams
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