What's the unit about? online puzzle

3x3 - 9 pieces4x4 - 16 pieces5x5 - 25 pieces7x7 - 49 pieces9x9 - 81 pieces10x10 - 100 pieces11x11 - 121 pieces12x12 - 144 pieces14x14 - 196 pieces20x20 - 400 pieces22x22 - 484 pieces Start a new game

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16

5