FutoshikiFree, no sign-up
Place 1 to N once in every row and column, using the inequality signs as clues. The puzzle changes at midnight Japan time (UTC+9) and is the same for everyone on the same day and size. Every puzzle has a unique solution.
🎉 Solved!
Random practice runs are not added to the leaderboard.
FAQ
What are the rules of Futoshiki?
(1) Place the numbers 1 to N (1 to 4 on a 4×4 board) once in every row and column. (2) Where there is a sign between two cells, the numbers must satisfy it (the open side of "<" is the larger one; for a vertical "∧", the lower cell is larger). That's all. Unlike Sudoku, there are no 3×3 boxes.
Why is it called Futoshiki?
Futoshiki comes from the Japanese word for "inequality". On the Japanese version of this site it is called "inequality Sudoku" because it plays a lot like Sudoku. The rules are the standard Futoshiki rules.
Any solving tips?
Start from the ends of chains of signs. For example, on a 5×5 board, if a < b < c, then a is at most 3 and c is at least 3. A cell that is greater than some other cell can never be 1, and a cell that is less than some other cell can never be N.
Does every puzzle have only one solution?
Yes. Every puzzle is built to have a unique solution. You never need to guess — logic alone is enough.
How is the leaderboard ranked?
By the time from opening the puzzle to filling it in correctly, fastest first. You only need a nickname, and you can submit up to 30 times a day per size. The server checks that your answer follows the rules.