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Three intersecting circles with gears. Pieces can be exchanged on two are rotated in each turn.
Rotabram is a 2D twisty puzzle inspired by the works of Douglas Engel, conceived and designed by Bram Cohen and Oskar van Deventer. Based on their earlier collaboration on Dual Circle puzzle, Bram challenged Oskar to design a puzzle based on the same mathematical concept, but now with three circles. Rotabram is the solution to this challenge.
The puzzle is played by turning the three big yellow gears. When these are turned, the small gears are changing orientation and the black hexagons are broken. As the big yellow gears have 42 teeth and the small red gears have 6 teeth, a red gear turns effectively one tooth forward when a yellow gear is turned 60 degrees. The object is to scramble the puzzle and then to get the puzzle back to its starting state.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Brandon Enright.
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