Sudoku pencil marks online
Practice candidate marking the same way you would on paper.
About this Sudoku page
Pencil marks (notes) keep possible digits visible until you eliminate them.
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.