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The solvable version of the problem. Here, cups A and C are upside down, and cup B is upright. The three cups problem, also known as the three cup challenge and other variants, is a mathematical puzzle that, in its most common form, cannot be solved. In the beginning position of the problem, one cup is upside-down and the other two are right ...
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T-Rex 3D Puzzle Building Kit. Not so much a brain teaser as it is a 3D puzzle, this T-Rex 3D puzzle-building kit is still a mild head-scratcher.