Sudoku HintSudoku guide
Play Sudoku and learn how to solve it.
Compare rows, columns and blocks to find where a number belongs. Watch the puzzle being solved, then try one yourself.
Fill in the numbers like this
Choose from four effect styles for placing numbers and completing groups. The demo is silent.
Choose from four effect styles for placing numbers and completing groups. The demo is silent.
What is Sudoku?
Sudoku uses a 9×9 grid. Each row, column and 3×3 block must contain 1–9 exactly once. The given numbers are your clues.
Why Sudoku is fun →Sudoku and brain training
Sudoku asks you to compare positions, keep track of possibilities and check your reasoning. It can be an enjoyable way to spend time thinking.
Sudoku and brain training →Learn techniques
Two examples let you practise just one technique without solving a whole puzzle.
How to Use Candidate Notes
What candidate notes are and how to use them
Naked Single
Consider the candidate numbers that could fit in an empty cell.
Hidden Single
Look for a cell within a row, column, or block where a specific number can only fit in one place.
Naked Pairs
When two cells in the same row, column, or block contain the same two candidates, those candidates can be removed from other cells in that area.
Locked Candidates
Use this when candidate cells for a number within a block are aligned in a single line (row or column).
Have more fun with Sudoku in the app!
Practise specific techniques or mixed exercises and save your progress. You can also scan a paper puzzle with the camera and read hints that explain the next move.
Free to try. Some exercises and hints require Premium.
About the app →