Sudoku Flow

October 7, 2026

0:00

What does this puzzle need?

How to play

  1. Tap a square, then a number. Every row, column and 3×3 box must hold 1 to 9 once.
  2. Turn on Notes to pencil in candidates. Placing a number clears it from the notes in its row, column and box.
  3. Hint shows a square you can fill now and why. If one of your numbers is wrong, it points to that first.

Keyboard: numbers fill a square, N switches notes, arrows move, Backspace erases, Ctrl+Z undoes. Your progress and time are saved on this device.

The puzzles come from our app, where a level is set by the hardest technique our solver used on a puzzle. What each Sudoku difficulty level asks of you →

Sudoku app icon

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.