Puzzle Details

This puzzle is an anti-sliding puzzle. When you put fifteen pieces in a case and you shake them, they're not supposed to move because they're tight. But there's a lot of puzzled shapes.

There are twenty-one ways to use all fifteen.
Seventy-two ways to use all fourteen.
There is only one way to use all thirteen.
There are two ways to use all twelve. It's about finding twelve and thirteen.

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