Sudoku in Brainura: classic and variants, no ads
The classic 9×9 number puzzle, with a clean board, no ads between puzzles, and levels that move you from friendly grids to diagonal and odd-even variants.
How to play Sudoku
- 1
Fill the grid
Every row, column and 3×3 box gets the digits 1 to 9.
- 2
No repeats
A digit may not repeat in a row, a column or a box.
- 3
Your way
Pick a cell and then a digit, or a digit and then cells. The digit pad sits right under the board.
- 4
Notes and undo
Mark candidates, undo any move. A wrong digit is taken off the board.
From easy to variant sudoku
| Levels | Puzzle | What changes |
|---|---|---|
| 1–10 | Classic | 46 clues, no clock: simple scanning is enough |
| 11–30 | Classic | Fewer clues, and a time limit |
| 31–50 | Diagonal | Both long diagonals must also hold 1 to 9 |
| 51+ | Odd-even | Every empty cell is marked odd or even |
| Top | Mixed | Modes at random, clues down to the low twenties |
0
ads, ever
1
solution per puzzle, reachable by logic
Free
one of 13 free games
Solving techniques worth learning
| Technique | How it works |
|---|---|
| Hidden single | Look at one digit at a time. If a 7 can only go in one cell of a box, it goes there, even if that cell has other candidates. |
| Naked single | If a cell has only one possible digit left, fill it. |
| Pair | Two cells in a row that can only hold the same two digits: remove those digits from every other cell in that row. |
Why sudoku is a good daily puzzle
Sudoku needs no arithmetic, only logic: every digit placed is a small deduction. That makes it a calm, absorbing way to focus for a few minutes. Like any puzzle, it makes you better at sudoku; whether that spreads to other skills is not well established.
Frequently asked questions
Is there a sudoku app without ads?
Brainura has no ads at all. Sudoku is free, along with 12 other games; Premium unlocks the rest of the 26 games.
What is diagonal sudoku?
A variant where, in addition to rows, columns and boxes, both main diagonals must contain the digits 1 to 9 once each.
Can I use notes?
Yes. You can mark candidates yourself or reveal the possible numbers for empty cells.
Does every puzzle have one solution?
Yes, each puzzle has a single solution that can be reached by logic.
Try next
Play Sudoku in Brainura
One of 26 short brain games with levels that adapt as you improve. Five minutes a day, no ads, no account.
Free to install · no ads · no account needed