A clean, fast Sudoku you can play forever — free and private. Every puzzle is freshly generated with a guaranteed unique solution, in Easy, Medium or Hard. Fill cells with the number pad or your keyboard, drop in pencil notes while you work out the tricky boxes, and let the optional mistake checker flag a wrong digit the moment you place it. A live timer and a remaining-count badge on each number keep you moving, and your best time for each difficulty is saved on your device. Runs entirely in your browser, works offline, no signup, no ads, no paywall.
On Mac, Windows, Linux or any computer: just click "Open Sudoku" above — it runs right in your browser, no install needed. To keep it like a desktop app, click the install icon (⊕) at the right of Chrome or Edge's address bar, or use Safari's File → "Add to Dock" on a Mac.
On iPhone or iPad: open it in Safari, tap the Share button, then "Add to Home Screen." It behaves like a native app — full-screen, offline-capable, launches from your home screen.