Rows
Each horizontal row must contain the numbers 1 to 9 without repeats.
Sudoku guide
How to play Sudoku
Fill the board so every row, column, and 3x3 box contains each number from 1 to 9.
5 Given number 5 at position 1 3 Given number 3 at position 2 Possible numbers 1, 2, 4 at position 3 Possible numbers 2, 6 at position 4 7 Given number 7 at position 5 Empty cell at position 6 Possible numbers 1, 4, 8 at position 7 Empty cell at position 8 Empty cell at position 9 6 Given number 6 at position 10 Possible numbers 2, 4, 7 at position 11 Empty cell at position 12 1 Given number 1 at position 13 9 Given number 9 at position 14 5 Given number 5 at position 15 Empty cell at position 16 Empty cell at position 17 Empty cell at position 18 Empty cell at position 19 9 Given number 9 at position 20 8 Given number 8 at position 21 Empty cell at position 22 Empty cell at position 23 Empty cell at position 24 Empty cell at position 25 6 Given number 6 at position 26 Empty cell at position 27 8 Given number 8 at position 28 Empty cell at position 29 Possible numbers 1, 2, 5 at position 30 Empty cell at position 31 6 Given number 6 at position 32 Empty cell at position 33 Empty cell at position 34 Empty cell at position 35 3 Given number 3 at position 36 4 Given number 4 at position 37 Empty cell at position 38 Possible numbers 2, 5, 6 at position 39 8 Given number 8 at position 40 Possible numbers 5 at position 41 3 Given number 3 at position 42 Possible numbers 6, 7, 9 at position 43 Empty cell at position 44 1 Given number 1 at position 45 7 Given number 7 at position 46 Empty cell at position 47 Empty cell at position 48 Empty cell at position 49 2 Given number 2 at position 50 Empty cell at position 51 Empty cell at position 52 Empty cell at position 53 6 Given number 6 at position 54 Empty cell at position 55 6 Given number 6 at position 56 Empty cell at position 57 Empty cell at position 58 Possible numbers 3, 5, 7 at position 59 Empty cell at position 60 2 Given number 2 at position 61 8 Given number 8 at position 62 Empty cell at position 63 Empty cell at position 64 Empty cell at position 65 Empty cell at position 66 4 Given number 4 at position 67 1 Given number 1 at position 68 9 Given number 9 at position 69 Empty cell at position 70 Empty cell at position 71 5 Given number 5 at position 72 Empty cell at position 73 Empty cell at position 74 Empty cell at position 75 Empty cell at position 76 8 Given number 8 at position 77 Empty cell at position 78 Empty cell at position 79 7 Given number 7 at position 80 9 Given number 9 at position 81
The rules
Rules
Columns
Each vertical column must also contain the numbers 1 to 9 without repeats.
Boxes
Each 3x3 box must contain the numbers 1 to 9 without repeats.
A turn
Solve by elimination
5 3 7 6 1 9 5 9 8 6 8 6 3 4 1 6 8 3 9 7 7 6 6 2 8 4 1 9 5 8 7 9
The animation selects one empty cell. The row is missing 2 and 5, and both are still allowed by the column and 3x3 box. When another 2 is placed in the same row, 5 is the only remaining answer for the selected cell.
- Choose an empty cell.
- Check its row, column, and 3x3 box.
- Mark possible numbers when more than one can fit.
- Come back when another clue removes a candidate.
- Place the number that remains.
In the app
Tools
Practice
Choose a difficulty and play at your own pace.
Daily challenge
Play the puzzle of the day and build a steady routine.
Notes
Mark possible numbers while you narrow down the answer.
Progress
Use stats to track streaks, solve times, mistakes, and completed games.
Support
Need help?
If something does not look right in the app, use the support option in the app or email support@dmascot.co.uk.