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Good Sudoku by Zach Gage

Publisher: Zach Gage
Price: Free with In App Purchases
Compatibility: iPhone & iPad

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App Description

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

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App Reviews and Ratings

Find out what users think of Good Sudoku by Zach Gage by reading the reviews and checking the rating.


532 ratings

Crashes without saving

Crashes multiple times a day and doesn’t save progress, so i have to solve puzzles multiple times

Sep 18, 2020

Game Center is mandatory, rude, and slow

It’s a great sudoku implementation, but I think it’s Game Center that can leave the app unresponsive—even after the board is displayed, I can’t start making notes often. It’s also tactless. How many people are getting a daily message that “you weren’t in the top 250”? To hell with that. So I logged out of Game Center, and now it won’t let me play the daily games at all. And if you try to play while logged out of Game Center, grab some coffee while the Game Center login page loads. It badly needs a way to opt out of this terrible experience.

Sep 18, 2020

The best Sudoku app on the market

Yet another amazing game by Zach. His attention to detail shines in all of his games, without compromising his own unique style. Zach’s take on this game offers a litany of different play styles and options. If you’re a Sudoku pro, or never played before, this app is the one to choose. I’ve been through multiple Sudoku apps, and I’ve finally found one I won’t be deleting anytime soon.

Sep 17, 2020

Crashes on iOS 14

Great game but it crashes on iOS 14. Please fix!

Sep 18, 2020

Frequent Crashes Ruin an Otherwise Perfect Game

This is an excellent app, but the free version crashes so frequently that I haven’t been able to finish a puzzle in days. It’ll crash while trying to load an ad, after an ad, after solving a puzzle, and randomly while playing and none of the progress between crashes is saved.

Sep 16, 2020

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