Free 4×4 to 7×7 No sign-up
Futoshiki
Latin squares with inequality clues between cells—more or less logic on every edge.
Fill each row and column with 1…n, and make sure every > / < sign is true.
Easy
4×4 grid · fewer clues
Medium
5×5 grid · more inequalities
Hard
6×6 grid · tighter logic
Expert
7×7 grid · deepest play