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Hollow Cube Puzzle 25mm Design 1 (Very Hard)

Not For Sale
This is my hardest puzzle yet. It is a 5x5 cube, and when completed measures 25x25x25 mm.

Dimensions

IN: 2.259 w x 2.259 d x 2.259 h
CM: 5.738 w x 4.788 d x 2.496 h