Good Sudoku by Zach Gage 4+

Sudoku that loves you

Zach Gage

Designed for iPad

    • 4.4 • 1.1K Ratings
    • Free
    • Offers In-App Purchases



You’ve never played Sudoku like this.

Good Sudoku turns your iOS device into an AI powered Sudoku genius whose only mission is to help you learn and love this classic game.

Whether you’ve never tried Sudoku, or you play every day, Good Sudoku’s elegant layout, intelligent hint system, and busywork reducing tweaks will help you play better and have more fun.

- Over 70,000 of the highest quality puzzles you’ll see anywhere
- Optional tools to reduce busywork
- AI powered hint support to continuously boost your skills
- 3 standard modes: Good, Arcade, and Eternal
- 3 Daily puzzle modes that get harder throughout the week + global leaderboards
- 5 levels of difficulty
- Import your own puzzles from elsewhere in Custom mode (and share them with friends!)


We put everything we could into making the best digital Sudoku game ever released:

- We wrote a puzzle generator from scratch to create over 70,000 of the highest quality puzzles you’ll see anywhere. We spent weeks figuring out how to generate intricate and complex puzzles you won’t find in other Sudoku apps. Our hardest puzzles require wild techniques like “XYZ Wings”, “Hidden Quadrouples”, “Jellyfish”, and “Swordfish”.

- Most people don’t know this but Sudoku puzzles are actually generated by programatic Sudoku solvers. The fastest way to know how hard your puzzle is, or if it’s valid, is to write a solver that knows all the strategies that can try it. With Good Sudoku, we run our solver as you are playing, so if you get stuck, it can detect what you know by looking at your answers and your notes, and then help you find the next technique you need to solve the puzzle.

- Most Sudoku games classify difficulty into vague Easy, Medium, and Hard difficulties — But what do these difficulties mean? Typically they refer to the kinds of solving techniques that are required to solve a given puzzle without resorting to guess-and-check. In Good Sudoku we aren’t vague about it at all. We lay out exactly which techniques are required for each difficulty level. Good Sudoku allows you to practice them individually outside of puzzles, and keeps track of which ones you’ve learned!

- When we first got interested in Sudoku we noticed that a lot of players spend most of their time looking at the board and counting. On easy puzzles, this counting serves as a way to increase the difficulty by making the puzzle take longer. We know some sudoku players love the counting but we found it a bit tedious and designed some tools to alleviate the busywork. At first these tools might feel a bit like cheating, but once your mind is freed up from counting you’ll have space to see the much deeper more fascinating side of Sudoku: all of the beautiful technique structures. Freed from the burden of busywork Sudoku becomes one of the best search-style games we’ve ever played. More fun than word-searches and solitaire, high-level Sudoku is a real treat — and with Good Sudoku and a little practice, anyone can learn it!

- We noticed when looking at other Sudoku apps although there are often daily puzzle modes, those modes never include global leaderboards. Weird! Good Sudoku remedies this problem!

- We wanted to make the best Sudoku out there, and while we’re proud of our puzzles, we recognize that puzzles come from all places. That’s why we built a quick and easy custom puzzle mode into Good Sudoku, so if you have a paper puzzle that you’re stuck on, or you’re trying some wild variant (Like the Miracle Sudoku!) it’s easy to put it into the game, play it, and share it with your friends. If the puzzle follows standard Sudoku rules, our hint system will even help you get unstuck!

We truly hope Good Sudoku can introduce you to, or deepen your love for this great game.

-Zach and Jack

What’s New

Version 1.0.22

This update has various small bugfixes to the tutorials, sharing puzzles, and the numpad.

Ratings and Reviews

4.4 out of 5
1.1K Ratings

1.1K Ratings

RickshawMe ,

Good start - a couple little things

Hi Zach and Jack, I hope you guys read these reviews. I’m a sudoku junkie and you fellas have yourselves a very nice little app here. I have 2 issues to report, one, kind of a big deal, the other not so much. The one that’s not a huge issue is a graphical issue: on phones that have the notch at the top of the screen like the iPhone X, Xs and 11, there is a graphical glitch that makes the “horns” of the screen white while the rest of it yellow. Now the 2nd issue: related to the Techniques functionality. When browsing a given technique, and then clicking Hint to get more info about the technique, you’re then given an option of Show Me. The issue is that when you click Show Me, there is hardly any time (about a split second) to see what the system is showing you. Almost immediately after clicking show me, the screen gets covered by another dialog box and it’s only options are to go back to the main menu, or try another example. For people to be able to learn, the screen that results from pressing Show Me needs to persist for as long as the user needs it, and further, you should be able to toggle back and forth between the before and after of the number changes. This is the other Sudoku apps do it. Great work so far and hope to see that update soon!

Dobby come on ,

Great customization!

UPDATE: I messed around with the settings and disabled most of the hand-holding things I disliked. The level of customization is really amazing. Changed from 3 stars to 4 stars. User interface takes a little to get used to, but is pretty good.

OLD REVIEW: I could see how this would be helpful for someone learning how to play sudoku, but as someone who’s used to pen and paper, this seems too easy. You can tap on the numbers to show you what squares could possibly be that number, which takes away the “aha!” moment from me and just makes me feel like the computer is doing all the work. Add that to the auto-enabled “feature” that only lets you put a note of a number if it’s possible with your current. Board state. Sounds good at first, but it takes most of the fun out of it for me. Could be good for others, but way to many crutch features for me.

russellbarnett ,

Bugs bugs bugs

My prior review seems to have vanished for some reason. This is a good app but the bugs are driving me bonkers. The AI that attempts to guess when you’re done eliminating candidates has been extremely flawed from day one and has literally always been more of an annoyance than a help. There is an option to turn it off in settings but the app ignores it. The developers response to my previous review about the setting being ignored? “If you don’t like that feature you can turn it off.” GEE THAT WOULD BE SWELL, MAYBE YOUR APP CAN LISTEN TO ITS OWN SETTINGS.

This current release not only STILL doesn’t fix this, it’s now worse. Now not only does the AI still randomly stop selecting a cell/group of cells when attempting to eliminate multiple candidates, it now also randomly switched modes to entering numbers. So in the middle of eliminating candidates it now, without warning, enters the number I’m trying to eliminate.

This has caused the app to register multiple “errors” in arcade mode and is really making me angry. Seriously, no one asked for this candidate AI “feature” and it has never worked. It is so buggy that even turning it off doesn’t work. This one thing is completely ruining the experience of an otherwise excellent app and I seriously cannot understand why getting the app to listen when I turn it off in its own settings is apparently so hard for the dev to accomplish.

App Privacy

The developer, Zach Gage, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Contact Info
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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