About PuzzleGrids

PuzzleGrids is a free Sudoku site built to load fast and work on any device, with no account and nothing to install.

How the puzzles are made

Puzzles are not pulled from a fixed list. Each one is generated in your browser: a full valid grid is built first, then digits are removed one at a time. After each removal a solver checks that the puzzle still has exactly one solution, and the digit is put back if it does not. Difficulty is set by how many starting digits are left, from about 40 on Easy down to 26 on Expert.

The Daily Sudoku uses the date as its starting point, which is how everyone gets the same puzzle without anything being downloaded.

What it costs

Nothing. The site is supported by advertising. Your game progress stays in your browser; see the privacy policy for details.

Get in touch

Found a bug or have an idea for another puzzle? Contact us.