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15-puzzle, Game of Fifteen. 3D Rendering Stock Illustration - Illustration of bone, puzzle: 106414453
![Steven Strogatz on Twitter: "Remember playing the 15 puzzle as a kid? The one where you slide 15 little square tiles around inside a rectangle? @KahleMatthew and colleagues have a new preprint Steven Strogatz on Twitter: "Remember playing the 15 puzzle as a kid? The one where you slide 15 little square tiles around inside a rectangle? @KahleMatthew and colleagues have a new preprint](https://pbs.twimg.com/media/Elp-8niXYAABeKn.jpg:large)
Steven Strogatz on Twitter: "Remember playing the 15 puzzle as a kid? The one where you slide 15 little square tiles around inside a rectangle? @KahleMatthew and colleagues have a new preprint
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