Best Sudoku App for Adults: Hard Puzzles, No Clutter

An adult who takes sudoku seriously usually wants four things: puzzles hard enough to need real technique, no ads, a plain board without cartoon clutter, and an app that does not track them across other apps. Sudoku Royale meets all four, free, with six levels up to Extreme. Good Sudoku comes close: no advertising label or tracking heading on its listing, the deepest puzzles here, and a one-time unlock instead of a subscription. NYT Sudoku is the choice if you already pay for NYT Games and are happy with three puzzles a day.

The App Store facts

From each app's US App Store listing, checked October 26, 2026. Prices and paid items change, so check the listing before you buy.

Depth, distraction and data

The columns below are the things that separate a puzzle app for grown-ups from one built to keep anyone tapping. The tracking column is whether the App Store privacy section on the listing has a "Data Used to Track You" heading, which means the developer says some data is used to follow you across other companies' apps and websites, usually for advertising.

A real difficulty ceiling

Many apps stop at an "Expert" level that a regular solver clears in a few weeks. After that, the app has nothing left to offer except speed. The question is what the hardest puzzles demand.

Sudoku Royale has Master and Extreme above Expert, and you unlock each one by solving puzzles at the level below. Its Dojo drills go up to X-Wing, Swordfish, XY-Wing and Simple Colouring, which tells you what the top levels expect. Good Sudoku is more explicit still: its listing names XYZ Wings, Hidden Quadruples and Jellyfish, and says its generator was written to produce puzzles you will not find in other apps. If you already solve with X-Wings, Good Sudoku has more room above you. Our apps for advanced players page goes into that end of the range, and Sudoku Royale vs Good Sudoku compares the two directly.

NYT Sudoku works differently: its listing describes a new puzzle every day in easy, medium or hard mode. There is no endless supply, so it suits a daily ritual more than a long evening of solving.

No ads, and nothing childish

Ads are the first thing most adults want gone, and the tone of an app is the second. Sudoku.com, Brainium and Staple Games show ads in their free versions, and Sudoku Now! sells a No-Ads Pack. Good Sudoku has no advertising label on its listing and charges $4.99 once for its Full Game Unlock. Sudoku Royale has no ads, no purchases and no subscription.

On tone, be fair about Sudoku Royale: it has a game layer. You earn shurikens for each solve, there is a weekly belt league, and you can dress an avatar. None of it sits on the board, and none of it is required. If you only open Practice and the Daily Challenge, you get a clean grid, a number pad and a timer. The belts are there if you like a weekly target. Sudoku by Staple Games is the plainest app here, with four levels, notes, a daily challenge and statistics, and ads.

Privacy

Sudoku Royale's App Store privacy section has no "Data Used to Track You" heading. It does not need an account: you start as a guest, and Sign in with Apple, email or Game Center is only there if you want your progress on another device. Of the other apps here, Good Sudoku also has no tracking heading, and NYT Games, Sudoku Now!, Sudoku by Staple Games, Brainium Sudoku and Sudoku.com list data used to track you. Our private sudoku apps page goes through the labels in detail.

Where another app is the better pick

• You want the hardest puzzles in an app. Good Sudoku's top end goes past Sudoku Royale's.
• You already pay for NYT Games. Its three daily sudoku puzzles sit next to the Crossword and Wordle; see Sudoku Royale vs NYT Sudoku.
• You want undo, or to check your own work. Sudoku Now! lists unlimited undo, and Sudoku.com lets you switch auto-check off. Sudoku Royale always checks each number and has no undo.
• You want no game layer at all. Staple Games has none, if you accept its ads.
• You play on Android, or want a native Mac app. Sudoku Royale is an iPhone and iPad app; on Apple silicon Macs it runs as the iPad app.

How this differs from the beginner and senior pages

If you are new to sudoku, the beginner apps page puts lessons and gentle hints first. If you mainly need large numbers and simple input, the apps for seniors is the better read. This page is for a confident adult solver who wants a challenge without distractions. If that is you, try Sudoku Royale and go straight to Hard. Everything else is on the sudoku app comparisons page.