Sudoku in three simple rules
Never played before? No problem. Sudoku is easy to learn and endlessly satisfying to master.
Fill every row
Each of the nine horizontal rows must contain the numbers 1 to 9 — each number used exactly once, with no repeats.
Fill every column
Each of the nine vertical columns must also contain the numbers 1 to 9, again with no number repeated.
Fill every 3×3 box
The grid is split into nine 3×3 boxes. Each box must contain all nine numbers once. Solve it when all three rules are satisfied!
What the board looks like
Dark cells are the given clues, green numbers are yours, and tiny corner marks are pencil notes.
Get going in six steps
Here's exactly how to play inside Sudoku Sally.
Start a level
Open the app and pick a difficulty — Easy, Medium, Hard, Expert or Diabolique. Complete a tier to unlock the next one.
Enter numbers
Tap an empty cell to select it, then tap a number on the keypad to place it. Tap again to clear a mistake.
Use pencil notes
Switch on Notes mode to add small candidate numbers to a cell. Perfect for tracking possibilities on tougher puzzles.
Take a hint
Stuck on a cell? Tap Hint and Sudoku Sally fills in the correct number for the selected square so you can keep moving.
Reveal the solution
Curious how it ends or want to learn a technique? Use auto-solve to reveal the full completed board instantly.
Track your stats
Every finished puzzle updates your stats — times, streaks, achievements and your ELO ranking from challenge matches.
Now it's your turn
You know the rules and you know the app. Download Sudoku Sally and solve your first puzzle today.