Futoshiki
A Latin square that must obey every greater-than sign.
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How to play Futoshiki
Fill the square so every row and every column contains each number from 1 to N exactly once — like a mini sudoku. The catch is the < and > signs between some cells: the values must obey them. Combine the Latin-square rule with the inequalities to deduce the one solution as fast as you can.
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Futoshiki — frequently asked questions
What do the arrows mean?
Each “greater than” / “less than” sign forces the relationship between its two neighbouring cells.
Is it like sudoku?
The row/column rule is the same, but there are no boxes — the inequalities replace them as clues.
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