Inequalities: play Futoshiki online
Futoshiki, the inequality sudoku: each digit once per row and column, respecting the < and > signs between cells. Grids from 4 × 4 to 6 × 6.
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How to play
Fill the grid: each digit once per row and column. The < and > signs between two cells tell which one is bigger.
Example
Each digit once per row and column, following the < and > signs between cells.
Tips to get better
- A cell that must be smaller than its neighbour can't hold the largest digit (and vice versa).
- Follow chains of signs: in “a < b < c”, a is at most N − 2.
- Combine signs and lines: when a digit has one place left in a row, place it before looking at the signs.
What this game trains
- Logical reasoning: deduce the solution from the rules, without guessing.
Levels
Easy · Hard · Expert · Hardcore — each level has its own leaderboard.
Challenge your friends
At the end of a game, send your score as a link: your friend plays exactly the same puzzle and you compare your times. There is also a daily challenge and tournaments.