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About Sudoku
Sudoku is a logic puzzle: fill a 9×9 grid so each row, column, and 3×3 box contains digits 1–9 exactly once. It rewards patience and clear thinking—no maths beyond following the rules.
Quick rules
Some cells start filled. Complete the rest so every row, column, and box has digits 1–9 with no repeats.
A digit is wrong if:
- It appears twice in the same row
- It appears twice in the same column
- It appears twice in the same 3×3 box
Tips on this site
Scan tight areas
Rows, columns, or boxes with few empty cells often give the next placement quickly.
Use notes
Turn on note mode to pencil in candidates; update them after each correct digit.
Avoid guessing
Every puzzle here is solvable by logic. If you are stuck, try a lower difficulty or read the strategy guides.
Learn more on Sudoku Online
Deeper guides live on their own pages—great for beginners and for levelling up.