Sudoku FlowPlay Sudoku online, free and without ads
Pick a level and start. Every puzzle has one answer and comes from the graded bank of our Sudoku app: Easy needs only singles, Extreme the hardest patterns.
Easy · #1
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What does this puzzle need?
A new puzzle every day
Spot it. Solve it. See why.
Short Sudoku puzzles that take a few seconds to try. Every answer is proved on the board, cell by cell, so you can check it with your own eyes.
How it works
- 1
Watch
A short video shows a board with one thing to find. You have five seconds.
- 2
Find it
Spot it before the timer runs out, or play the same board on its page.
- 3
See why
The answer is proved on the board, cell by cell, so you can check it yourself.
- A new puzzle every day
- Japanese and English
- Free, no sign-up
Latest puzzles
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Latest lessons
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Find the Mistake Sudoku
Find the Mistake is a quick Sudoku puzzle: a half-finished board where one digit breaks the rules. You get five seconds to spot it before the answer is shown on the board.
Learn the techniques
Sudoku is solved with named techniques, from the first single to X-Wings and chains. Our app's site has the full library, with a worked example for each one.
Sudoku for kids
See the sheets →Printable 4×4 and 6×6 sheets with answers.
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4×4 Sudoku for Kids: Printable Sheets
Every row, column and 2×2 box needs 1, 2, 3 and 4.
See the sheets →135641361425462236
6×6 Sudoku for Kids: Printable Sheets
Every row, column and 2×3 box needs 1 to 6.
See the sheets →23314313
Picture Sudoku for Kids: Printable Sheets
Every row, column and 2×2 box needs one of each shape.
See the sheets →23314313
Christmas Sudoku for Kids: Printable Picture Puzzles
Every row, column and 2×2 box needs one bauble, one tree, one present and one star.
See the sheets →
Want more boards like this?
We also make a Sudoku app for iPhone, iPad, Mac and Android. There are no ads in it at all, it works offline, and when you ask for a hint it shows you the technique instead of just filling in a number.
Sudoku Flow is made by Rubigo Games, the developer of the Sudoku app recommended on this site.