• Hydrazoid
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    The bottom half is logical...you might say the top half is the inverse of logical.
    December 6, 2016, 7:55 pm
  • luxion_1
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    If you think symmetrically and then diagonally, you'll get it.
    February 19, 2017, 10:17 pm
  • littlebitocd
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    The row of zero is not included in the top or bottom, the top half is a black for white negative of the completely logical bottom half.
    March 16, 2020, 10:39 pm