3D put-together puzzles are difficult because each piece may be rotated into many different orientations, e.g., 24 for a Soma cube, which is much larger than 4 in a typical 2D jigsaw puzzle.

Make 3D puzzles easier by constraining the possible rotations. Forcing one side to be the "top" constrains to plane rotations.

Incidentally, a 2D jigsaw puzzle based on a hexagonal tiling (6 possible orientations per piece instead of 4) seems an easy way to make a puzzle more difficult with little increase in manufacturing difficulty.

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