00:00
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Hard
8
9
1
6
8
9
2
7
2
4
6
5
6
3
4
8
6
4
2
5
9
2
5
4
6
2
7
7
8
5
1
3
5
4
New game
Fill every row, column, and 3×3 box with the digits 1–9 (no repeats). Select a cell, then use the number pad or keyboard. Turn on Notes to mark candidates; use Hint if you're stuck.
About Hard puzzles
For experienced solvers. Fewer givens mean you'll rely on notes, pairs, and triples. No guessing—pure logic. Use our Techniques guide to spot patterns.
How we generate puzzles: Every puzzle is created for this session and has exactly one solution. Difficulty is set by how many numbers we leave in the grid—fewer givens means a harder, logic-based challenge. Read more.
Who it's for: Pro Sudoku is free, with no sign-up, for all ages. Whether you're a beginner or an expert, you can play on any device. About us · Techniques