Thinking about the nature of the beast, I'd bet on powers of 4 having extra solutions and the squares that that have 4xN+1 sides (5, 9, 13, 17) having extra solutions as well. I think the 16x16 will have at least 2**16 solutions since it is actually a 2x2 of 4x4s and the 4x4 had 2**4 solutions. It also wouldn't suprise me that 13x13 had 8**8 solutions.

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In reply to Re: Re (tilly) 1: 5x5 Puzzle by extremely
in thread 5x5 Puzzle by Adam

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