New Puzzle Every Day
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Play Sudoku Online Free – Easy, Medium & Hard Sudoku Puzzles

Alpha Sudoku is the best sudoku game to play sudoku online — totally free, ad‑free, and blazing fast. Choose from easy, medium, and sudoku hard modes, or try our everyday puzzles in the Daily Challenge. Whether you want a free sudoku puzzle for a quick break or a full‑blown challenge, this sudoku online experience works beautifully on desktop and as a sudoku game mobile PWA. Prefer an easy sudoku app? Just install Alpha Sudoku to your home screen.

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Daily Challenge
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📘 Sudoku Book (1008 Puzzles)

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Frequently Asked Questions

Is Alpha Sudoku a free sudoku game?

Yes. You can play sudoku online free with zero ads.

Can I play sudoku online on mobile?

Yes. Alpha Sudoku is a fast sudoku game mobile experience and can be installed like an app.

Do you offer easy sudoku and sudoku hard modes?

We have easy, medium, and hard sudoku levels so you can pick the perfect challenge.

Do you publish a daily sudoku puzzle?

Yes — our Daily Challenge gives you fresh everyday puzzles.

Does Alpha Sudoku work offline?

Yes. It’s a PWA that caches core pages so you can keep playing even when offline.