I came across a very difficult puzzle. What number should be placed in that last slot? I only know 16 is not the correct answer, because 11 is before 10.
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4I think you have misunderstood the game ... – Matti P. Jul 03 '20 at 07:27
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1This should be put on puzzling.stackexchange, if anywhere. – Especially Lime Jul 03 '20 at 07:40
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The correct answer is 18, but I don't know why and how to make that conclusion. – James Jul 03 '20 at 07:50
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At least , in this puzzle , there is a little context (the famous $15$-puzzle), but still there are surely several possibilities for the missing entry that can be well justified. – Peter Jul 03 '20 at 09:23
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The $6$ and $9$ are upside-down, and this restores the parity (of the sliding block puzzle).
JMP
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