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Sudoku: fill the grid with logic

puzzle Place the digits 1 to 9 so that no row, column or 3x3 box repeats a number. Every puzzle has exactly one solution, so you never need to guess. Free, no download, no sign-up.

How to play

  1. Choose Easy, Medium or Hard and press Start.
  2. Tap an empty cell, then tap a number on the pad (or type it on the keyboard).
  3. Use Erase to clear a cell you filled by mistake.
  4. Complete the whole grid with no repeats to finish and see your time.

Questions

Does every puzzle have one solution?

Yes. Each puzzle is generated so that only one valid answer exists.

Is it free?

Yes. It runs in your browser with no download and no account.

Is my best time saved?

Yes, your best time stays on this device and browser.

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Credits and license

Game code by mashukui, released under the MIT license. Adapted for VISU Games. Source code