Polyominoes are formed by joining unit squares to form larger pieces. Pieces are confined to the square grid.
Monomino - 1 (1 tile)
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Domino - 1 (2 tiles)
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Trominoes - 2 (6 tiles)
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| 1 | 2 |
Tetrominoes - 5 (20 tiles)
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| 1 | 2 | 3 | 4 | 5 | |
| I | L | T | N | O |
Pentominoes - 12 (60 tiles)
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| 1 | 2 | 3 | 4 | 5 | 6 |
| I | L | Y | N | P | F |
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| 7 | 8 | 9 | 10 | 11 | 12 |
| T | U | V | W | X | Z |
Hexominoes - 35 (210 tiles)
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
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| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
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| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
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| 29 | 30 | 31 | 32 | 33 | 34 | 35 |
For higher orders of polyominoes, the number of pieces is as follows:
Heptominoes - 108
Octominoes - 369
Enneominoes - 1285
Decominoes - 4655