Fire hazard index online puzzle

4x3 - 12 pieces5x4 - 20 pieces7x5 - 35 pieces8x6 - 48 pieces9x7 - 63 pieces11x8 - 88 pieces12x9 - 108 pieces13x10 - 130 pieces14x11 - 154 pieces15x11 - 165 pieces16x12 - 192 pieces25x19 - 475 pieces Start a new game

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