I can't crack this one. Any help is appreciated,


  • $\begingroup$ Please attribute your puzzle's source. $\endgroup$ – humfuzz Oct 4 '18 at 1:09
  • $\begingroup$ Actually, I don't have a source. A friend just handed me this exact scrap of paper! $\endgroup$ – PerpetualStudent Oct 4 '18 at 1:59

I believe the answer is

___ 10 ____


The center cell increased by one, then the blank cell in the next pattern is a sum of numbers that previously surround the cell. For example top left 10 in the second pattern is from 1+5+4, and bottom right 10 in the second pattern is from 2+3+5.

  • $\begingroup$ noooooooooo! i was making an answer....... cruel world...... $\endgroup$ – Alto Oct 4 '18 at 1:07

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