Game of Fifteen [![Documentation Status](https://readthedocs.org/projects/scala-game15/badge/?version=latest)](https://readthedocs.org/projects/scala-game15/?badge=latest)
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For an explanation of the problem, see: http://en.wikipedia.org/wiki/15_puzzle

The board size is set to 3 to reduce problem complexity.
The algorithm works with any board size, but a bigger heap will be needed to avoid stack overflow.