Free Sudoku with no ads

Why ads ruin a puzzle game

Sudoku is a game of concentration. You hold candidates in your head, scan rows and boxes, and build a chain of small deductions. An ad that appears between two moves breaks that chain, and a banner that moves next to the board pulls your eyes away from it.

Ads also change how a game is designed. When revenue depends on views, hints get locked behind videos, mistakes are punished so you watch an ad to continue, and puzzles are cut short to show the next ad sooner. A calm puzzle game has to be built without that pressure.

What is free in Kaizen Sudoku

Everything you need to play is free, for as long as you like:

• Unlimited puzzles at every difficulty level, from Beginner to Legend.
• The daily challenge, with streaks and monthly trophies.
• 3 free hints in every game, plus extra hints and continues paid with the points you earn by solving.
• Notes, unlimited undo, mistake highlighting and a mistake limit you can switch off.
• Full statistics, several games in progress and offline play.
• Three hand-crafted themes, each with a night variant.

There is no account to create and no trial that runs out.

Optional purchases, never a subscription

Kaizen Sudoku is paid for by players who choose to support it, not by advertisers. Every purchase is optional and one-time; nothing renews, and the game stays complete without them.

All Themes unlocks every premium theme, including themes added in future updates. Lifetime Premium adds unlimited hints and unlimited continues at the mistake limit on top of all themes. Credit packs give you extra hints or continues, one credit each, and never expire.

How to play Sudoku for free without ads

Install Kaizen Sudoku from the App Store or Google Play and start a game at the level that suits you. If you are new to Sudoku, begin with Beginner: those puzzles can be solved with singles alone. Turn on mistake highlighting while you learn, and turn it off later when you want a real challenge.

Play the daily challenge once a day to build a habit. A few minutes a day is enough to get noticeably faster within weeks, and your statistics show the progress.

Private by design

Your games, statistics and settings are stored on your device. There is no advertising SDK, no ad tracking and no account. Anonymous usage statistics and crash reports help us fix problems; the privacy policy explains exactly what is collected.