Play hard Sudoku
Hard Sudoku puzzles that reward careful candidate work.
About this Sudoku page
Expect fewer givens and more intersection scanning than medium.
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.