Hard Sudoku

Cách chơi

1. Fill every row, column and 3×3 box with the numbers 1 to 9.
2. Pencil in candidates with Notes, then look for pairs and patterns.
3. Each puzzle has one solution, reached by logic, never by guessing.

Điều khiển: Click or tap a square, then a number, or use the arrow and number keys

Giới thiệu game

Hard sudoku is for solvers who have outgrown the basics. These puzzles start with only about 24 to 28 givens, and simple scanning gets you only a short way before the grid goes quiet. Play free sudoku hard puzzles online with the same tools you would use on paper: pencil notes, undo, error checking and hints when you need them.

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