Sudoku: a quick playing guide
Fill the nine-by-nine grid so that each row, each column and each three-by-three box contains the numbers 1 through 9 exactly once. Starting numbers stay fixed. Every new board is generated here and checked to have exactly one solution. Use pencil notes to keep track of possible numbers, and work through the grid at your own pace.
How do you control Sudoku?
Select a cell, then type 1–9 or use the number buttons. Arrow keys move. N toggles notes; Delete or Backspace clears an entry. Check marks incorrect entries, and Hint supplies one correct number.
What should a beginner try?
Start with a row, column or box that already contains several numbers. Check every candidate against all three constraints before filling it in.
Do you need an account?
No. You can play this browser version without signing up or installing a plugin.