Select an empty cell, then choose a number.
Sudoku 9×9 Challenge
Fill each row, column, and 3×3 box with the numbers 1–9 without repeats. Every puzzle has one solution. Duplicate numbers are highlighted; trying a number never ends your game. Use Check when you want to compare your entries with the solution.
Solving tips and controls
Tap a cell and use the number buttons, or type 1–9. Use arrow keys to move, Backspace or Delete to erase, N for pencil notes, and Ctrl/Command Z to undo. Add possible numbers in Notes mode; entering an answer removes that number from notes in its row, column, and box.
Hint fills one cell with an answer. You have three hints for each puzzle, including after undo or reset. Progress, notes, and active solving time are saved in this browser when storage is available. New replaces your saved puzzle; Reset clears this puzzle. Printing includes the original puzzle and its solution.
Einstein’s Riddle
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