Classic and Samurai sudoku, free in your browser. Solver-verified puzzles at four difficulties. No ads, no sign-up, no account — pick a difficulty and start solving.
One 9×9 grid. Three rules. Infinite depth.
Free play is anonymous — your progress lives only in this browser. For the full campaign, six warrior ranks, daily challenges, and stats, grab the iOS or Android app.
Most free sudoku sites are buried in banners, autoplaying video, and newsletter pop-ups. We stripped all of that out. What’s left is a clean parchment board, a focused number pad, and puzzles you can actually trust.
Play unlimited puzzles in your browser. No account, no email, no paywall. Your progress lives only on this device.
Every puzzle is generated then verified to be solvable by pure logic. Never a guess, never a wall.
Conflict highlighting, pencil marks, and three free hints per puzzle — on desktop, tablet, or phone.
Difficulty here isn’t about how many cells are blank. It’s about which logical techniques the puzzle requires. Easy puzzles can be solved with singles alone; Master puzzles will ask for the heavy machinery.
The standard puzzle. Fill a 9×9 grid so every row, every column, and each of the nine 3×3 boxes contains the digits 1 through 9 exactly once. Easy puzzles need only naked and hidden singles; Master puzzles bring in X-Wings, Swordfish, and Y-Wings.
Five overlapping 9×9 grids share their corner boxes with a centre grid. Solve them as one puzzle — every digit you place propagates across two grids at once. Harder than classic, far more elegant when it clicks.
New to the puzzle? Start with the beginner’s guide or jump to solving techniques from singles to X-Wings.
Yes. The Sudoku Samurai web player is fully free to use, with no ads, no sign-up, and no account. Play unlimited Classic and Samurai puzzles directly in your browser.
Classic sudoku is a single 9×9 grid solved with three rules: each row, column, and 3×3 box must contain the digits 1 to 9 exactly once. Samurai sudoku is five overlapping 9×9 grids that share their corner boxes — you solve them as one puzzle, with each digit propagating across two grids at once.
Each puzzle is generated by our solver and then verified to require only logical techniques — naked singles, hidden singles, pointing pairs, X-Wings, and so on, depending on difficulty. No puzzle on the site requires guessing.
Yes. The web player is responsive and works on iOS and Android phones, tablets, and desktops. For the full experience — six warrior ranks, daily challenges, the Japan campaign, and personal stats — get the free Sudoku Samurai app for iOS or Android.
Your in-progress puzzle is saved to this browser only. Close and reopen the tab and you can pick up where you left off. Clearing your browser data or playing in private/incognito mode will erase your progress.
