About Sudoku Whale

Sudoku Whale is a free online sudoku site built to do one thing well: give you an unlimited supply of high-quality sudoku puzzles, instantly, on any device.

What We Offer

• Unlimited unique puzzles at easy, medium, and hard difficulty.
• Verified quality: every puzzle is generated and programmatically checked to have exactly one solution — no broken grids, no guessing required.
• Free forever, no sign-up: no accounts, no email, no paywall.
• Play anywhere: the board adapts to phones, tablets, and desktops, with keyboard shortcuts for desktop players.

Privacy

We do not ask who you are. There are no user accounts, and your in-progress games are stored only in your own browser's local storage — never on our servers. Clearing your browser data removes them.

The Site

Sudoku Whale is built as a fast, lightweight static website: pages load quickly even on slow connections, and the puzzle generator runs entirely in your browser. Start playing on the home page, learn the rules, level up with strategies, or jump straight into play sudoku online.