Puzzle - shaped key holders for organization​ Transportation - themed puzzles with cars and trains​ MANIFOLD 2

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100 new origami paper puzzles to wrap your mind around! Fold each 9x9 sheet into a 4x4 square so that only black shows on one side and white on the other. Each level adds to a new wrinkle. Will these puzzles cause you to crumple or can you bend them to your will?