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A 2x2x2 made mostly of air.
Hollow 2x2x2 is a 2x2x2 Rubik's Cube that has been hollowed out. The puzzle has a rails mechanism that keeps the parts together. One corner acts like a core surrounded by seven corners. There are nine hidden edge rails and three hidden centers.
In 2019, Meffert's made a mass-produced version, including one with transparent "clear" body.
Edge length: 59 mm
Weight: 88 grams
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