Ninjoku — Free Daily Sudoku Puzzles Online

Play free Sudoku in your browser: a fresh, hand-checked daily challenge every day, classic grids from Easy to Expert, plus Killer and Jigsaw variants. Smart notes, an optional coach that teaches every solving technique, and a 1,000-level ladder. Offline-first, no ads.

New to Sudoku, or stuck on a tough grid? Learn the solving techniques step by step — from naked singles all the way to the X-Wing.

Frequently asked questions

Is Ninjoku free to play?

Yes. Ninjoku is completely free to play online at ninjoku.com — no download, no account, and no ads between you and the puzzle.

Is there a new daily Sudoku puzzle every day?

Yes. A fresh, hand-checked daily Sudoku puzzle is published every day, and you can also play unlimited classic grids from Easy to Expert plus Killer and Jigsaw variants.

Do I need to sign in or install an app to play Sudoku?

No. Ninjoku runs free in your browser with no sign-in and no install. It is offline-first, so your progress is kept on your device.

Can Ninjoku teach me how to solve Sudoku?

Yes. An optional coach teaches every solving technique from naked singles to the X-Wing, with step-by-step hints on any puzzle.