15x15 Medium - are they actually difficult?

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  • CopperCable
    Member
    • May 2014
    • 1

    #1

    15x15 Medium - are they actually difficult?

    Maybe I've gotten really unlucky, but it seems that more often than not, the medium difficulty 15x15 puzzles can be hard.

    So my question - what makes a 15x15 puzzle easy, medium or difficult? How does the system know which puzzle is harder than the others?
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