echogram online puzzle

3x3 - 9 pieces6x6 - 36 pieces6x7 - 42 pieces8x9 - 72 pieces9x10 - 90 pieces11x12 - 132 pieces12x13 - 156 pieces14x15 - 210 pieces21x23 - 483 pieces30x33 - 990 pieces Start a new game

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