Sudoku auto notes
Optional auto-notes fill legal candidates so you can focus on elimination.
About this Sudoku page
Auto notes update candidates as you place digits — useful when learning scanning patterns.
FAQ
Everything you need to enjoy Sudoku with calm, focused play.
How do I play Sudoku online?+
Fill each row, column, and 3×3 box with digits 1 to 9 exactly once. Tap or click a cell, then choose a number from the keypad.
Is an account required to play Sudoku?+
No. You can start immediately in your browser without creating an account.