Conservation of matter and energy online puzzle

3x4 - 12 pieces4x7 - 28 pieces6x9 - 54 pieces7x11 - 77 pieces8x12 - 96 pieces8x13 - 104 pieces9x14 - 126 pieces10x15 - 150 pieces11x18 - 198 pieces18x28 - 504 pieces25x40 - 1000 pieces Start a new game

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