About Freshdoku

Independent puzzle project

Freshdoku exists for one reason: the web is full of Sudoku sites that hide the puzzle behind sign-up walls, paywalls, and aggressive pop-ups. This one doesn't.

Freshdoku is a free, browser-based Sudoku generator. You choose a difficulty, it creates a brand-new puzzle with a guaranteed unique solution, and you print it or save it as a PDF or PNG. There is no account, no email capture, and nothing to install. The puzzles are generated entirely on your own device — the maths happens in your browser, not on a server somewhere.

How it's built

Every puzzle is produced by a generator that first builds a complete, valid solution, then removes numbers while continuously checking that exactly one solution remains. A second pass grades the puzzle by the hardest logical technique needed to solve it, which is how the easy, medium, and hard labels stay honest rather than just counting blanks.

How it stays free

A single, unobtrusive advertisement on the page covers hosting and keeps the tool free for everyone. There are no pop-ups, no interstitials, and no auto-playing anything — just the puzzle and one quiet ad slot off to the side.

Spotted a bug or have an idea? The contact page tells you how to get in touch.