Happy birthday online puzzle

5x4 - 20 pieces6x5 - 30 pieces7x6 - 42 pieces8x7 - 56 pieces10x8 - 80 pieces11x9 - 99 pieces12x10 - 120 pieces13x11 - 143 pieces15x12 - 180 pieces16x13 - 208 pieces17x14 - 238 pieces18x15 - 270 pieces20x16 - 320 pieces21x17 - 357 pieces22x18 - 396 pieces23x19 - 437 pieces25x20 - 500 pieces26x21 - 546 pieces Start a new game Create a multiplayer game table

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