About Sudokusama

What you can play

• Classic Sudoku — the full 9×9 grid across six difficulty tiers, from a gentle Easy to a genuinely mean Evil.
• Daily Challenge — one hard puzzle a day, the same for everyone, refreshed at midnight IST. Build a streak.
• Mini Sudoku — quick 6×6 and 4×4 grids that solve in a couple of minutes.
• Killer Sudoku — cages and sums layered onto the classic grid, for when plain Sudoku stops being a challenge.
• Time Rush — solve as many puzzles as you can before the clock runs out.
• Multiplayer — race friends on a shared board in real time.

Free, and no sign-up

Every mode is playable without an account. Your games save automatically in your own browser, so you can close the tab mid-puzzle and pick it up later. An account is only needed if you want your stats to follow you and to appear on the Daily leaderboard.

Learn, don't guess

A good Sudoku is always solvable by logic alone — never by guessing. That belief shaped the rest of the site: a full How to Play guide for beginners, a strategy guide covering the techniques experienced solvers actually use, a technique reference, a solver for when a puzzle from elsewhere has you stuck, and printable sheets for a screen-free break.

Built to get out of the way

Every puzzle is generated fresh and checked to have exactly one solution. The site works on phones, has a proper dark mode, is playable entirely from the keyboard, and is available in six languages. There is no tracking, and we ask for as little from you as possible.

Say hello

Found a bug, or have an idea for a mode? Email sudokusama@gmail.com — see the contact page.