Square Mixup improved version
Buy at Copyright (c) 2013, M. Oskar van Deventer. Square Mixup was proposed by Krystian Wilisowski. Whereas the Square One puzzle allows only 180degrees moves for the central square, and the 90degrees midturn position is only shown for photogenic purposes, the 90degrees move is actually functional in Square Mixup. In that position, all 24 sliding pieces are linked in one long daisy chain. Original prototype here:
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