Sudoku X online
Sudoku X (diagonal Sudoku) free in your browser with timer, notes, and hints.
About this Sudoku page
Both main diagonals join rows, columns, and boxes as unique 1–9 units.
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.