ArcPuzzle

Clear numbers · No timer

Sudoku

Fill every row, column, and outlined box with each number once. Notes, undo, and gentle hints are always available.

0of 8
solved

Choose an empty square, then choose a number.

4 × 48 left
Puzzle size
Price
Free
Where to play
In your browser
Account
Not required
Timing
No timer
How to play, accessibility, and questions

How to play

A simple guide to Sudoku

Solve a uniquely generated 4×4, 6×6, or 9×9 number grid with large cells, candidate notes, undo, and gentle hints.

Rules for this version

  1. Choose an empty square and then choose a number.
  2. Use every number once in each row, column, and outlined box.
  3. Complete the grid, using notes, undo, or a hint whenever helpful.

Comfort and accessibility

  • Three board sizes let you choose a comfortable amount of detail.
  • Arrow keys move between cells, and number keys enter a value.
  • An incorrect number stays editable and never costs a life.

Common questions

Does every Sudoku have one solution?

Yes. The generator checks that each published puzzle has exactly one solution.

Can I write candidate numbers?

Yes. Turn Notes on to add or remove small candidate numbers in an empty square.

Is Sudoku timed?

No. Progress is saved locally so you can stop and continue later.