Hardest Sudoku online
Push into expert-level grids with sparse givens and long logic chains.
About this Sudoku page
Expert mode is for players who want deep scanning, pairs, and careful note discipline.
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.