⊞ Futoshiki

Futoshiki is a Japanese logic puzzle. Fill the grid so each row and column contains 1–n exactly once, while every < and > sign between neighbouring cells is respected.

How to play

1. Tap a cell and enter a digit from 1 to n.
2. No digit may repeat within a row or column.
3. Every inequality sign must be satisfied — use them to deduce forced digits.

Strategy tips

• Read the signs first: a cell that must exceed a neighbour can never be 1, and one that must be smaller can never be n.
• Chains of inequalities hand out free digits — a long chain forces its endpoints completely.
• When the signs run out of information, fall back on the Latin rule: no digit repeats in a row or column.

FAQ

Is Futoshiki the same as Sudoku?

Same core — each digit once per row and column — but instead of 3×3 boxes you get inequality signs between cells, and they do most of the solving work.

What size are the grids?

Difficulty sets the grid size; larger grids mean a wider digit range.

Can digits repeat in a row?

Never — each row and column contains 1 to n exactly once.

Difficulty affects grid size and time is your score — finish fast, post to the daily leaderboard, or race a friend.

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