How to play Sudoku
Click any empty cell to select it, then type a number from 1 to 9 or click a number button. Red highlighting means a conflict — the same number already appears in that row, column, or 3×3 box. Click 'New Puzzle' to load a fresh puzzle.
Sudoku rules
A valid Sudoku solution requires: every row contains each digit 1–9 exactly once; every column contains each digit 1–9 exactly once; every 3×3 box contains each digit 1–9 exactly once. The puzzle has exactly one solution.
FAQ
Does this Sudoku have only one solution?
Yes. Each puzzle included in this tool has been verified to have exactly one unique solution — a requirement for a well-formed Sudoku puzzle.
Can I use the keyboard to play?
Yes. Click a cell to select it, then type 1–9 to enter a number, and Backspace or Delete to erase. Arrow keys move the selection between cells.