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 Expert puzzles
The toughest level. Demands advanced techniques such as X-Wing, Swordfish, and Y-Wing. For puzzle enthusiasts who want a real challenge. Every puzzle has exactly one solution and is solvable by logic alone.
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