About

This sliding piece puzzle has 13 pieces which form two intersecting disks. One disk can only do half turns, while the other disk can also do quarter turns. There are two piece shapes; seven triangular ones, and six which are teardrop shaped. Each disk has four of each. The most interesting fact of this puzzle is that it occurs on the Rubik's cube (and the domino). If you scramble the cube using only the moves U and R2, then the corners of the top and right faces correspond to the teardrops, and the edges to the triangular pieces. A brief discussion of the subgroup <U, R2> can be found in David Singmaster's "Notes on Rubik's 'Magic Cube'", fifth edition, page 57. Related puzzles are Turnstile, and especially Rashkey. I got this puzzle as an advertising freebee, and on the back it has the title of the puzzle (TURN'PUSH ®) and "Lotica Patent no. 9503633". Other versions show Lotica as the puzzle's name. That patent number refers to the original French patent, filed 28 March 1995, by Serguei and Alexandre Bagdassarian. The equivalent world patent is WO 96/030097. If your browser supports JavaScript, then you can play Turn'Push by clicking the link below: