Puzzle IO is super simple and crazy addictive! Discover a new kind of Sudoku with modern graphics, animations, and ease of use!

Millions of top class puzzles with selectable levels of difficulty, all free! :)
All levels of difficulty are infinitely generated and are different every time!
To play Puzzle IO, fill each 10 by 10 grid with 0 and 1. Each row and each column must contain the same number of 0 and 1. Three 0 or three 1 in a row isn't allowed ! Will you figure out the solution quickly enough and beat the best scores ?

Puzzle IO also features :

=> A smart point system ! Each complete and valid row gives you 11 points and you get to multiply that by 20 or more ! But be careful, the multiplier will decrease over time !

=> With Game Center implemented, you can now rank and compare Puzzle IO scores against your friends and challenge them to beat your highest score !

=> Six levels of difficulty which will test your wits in more than one way !
You gain access to medium, hard, expert and nightmare levels by defeating the previous difficulty level. All levels are generated on the spot, you won't face the same grid twice !
We'll go back to the game now, see you in there !

What’s New

Version 1.6.8

Hi fellow Puzzlers!
We've worked hard to bring you a better, more stable, more efficient and more enjoyable version of Puzzle IO!

In this version you will find a NEW CHALLENGE MODE! In this new Challenge mode you'll be able to play grids with a limited amount of errors possible (lives) making that mode a more challenging game!

If you'd still rather play the game as you usually would, you will be able to play the CLASSIC MODE and avoid playing with an error limit all together!

We've also fixed the Notification issue displaying the two "Yes" button choices as well as some other under the hood bugs.

We hope you'll enjoy it! See you in there!

The 99 Up Games Team

Ratings and Reviews

4.6 out of 5
138 Ratings

138 Ratings

Solarbear16 ,

Love this game!

This is the best version of this game I've found. Sometimes the color correct answer doesn't show up, it just spins in black and white; but a minor glitch. It's good for quick games!

But, why is the hard version harder than expert or nightmare? And why is nightmare easier than expert? Seems counterintuitive.

Blobberfish ,

Fun thinking game

Only wish you could get hints during play

Medrivet ,


Love the layout and how quick it is, but the nightmare puzzles seldom show up when you click on them. I’d welcome more challenging levels.


Jonathan Lepage
117.1 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Chinese, Dutch, French, German, Italian, Japanese, Spanish

Age Rating
Rated 4+
© 2012-2019, 99 Up Games
In-App Purchases
  1. Remove Ads $2.99


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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