About Sudoku AZ

A small site with a single purpose: good Sudoku you can play in your browser, free, on any device.

What this site is

Sudoku AZ is a collection of hand-built Sudoku games: the classic 9×9 puzzle in three difficulty levels, plus four genuine variants — Color Sudoku, Killer Sudoku, Chain Sudoku and Flower Sudoku. Each one is a real, distinct game with its own rules and its own solving logic, not the same board wearing a different coat of paint. The domain has been home to browser Sudoku since the mid-2010s, and this is its modern incarnation: no Flash, no plugins, nothing to install.

How the puzzles are made

Every puzzle on this site is generated with a guaranteed unique solution and verified by a solver before you ever see it. That is a promise about fairness: you will never need to guess, and logic alone is always enough to finish a board. Difficulty levels are set by how many clues you start with and which techniques the board demands, so an easy puzzle is genuinely easy and an expert one genuinely earns its name.

How the site works

• Free, with no account. Your progress, statistics and preferences are saved locally in your own browser, and nowhere else.
• No tracking. The site loads no third-party analytics, no ad networks and no external scripts of any kind.
• Fast by design. Each game ships as a single small file, so it starts instantly even on a slow connection.
• Works everywhere. Phone, tablet or desktop, with a light and a dark theme that follows your system preference.

Get in touch

Found a bug, or have an idea for a variant you would like to play here? Feedback is always welcome — write to [email protected].