The CircleTrap Puzzle
The twelve pieces of this puzzle are a complete selection within certain parameters. 359 different solutions to fit the pieces into the tray, but so tough you will probably need to resort to looking at the solution on the back. Also engraved on the back are five extra shapes that the pieces can make outside of the tray and the number of solutions for each of those shapes, ranging from the easiest (3739 solutions) to the most difficult (only 56 solutions).
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