ONO: Think Straight 4+

Fun! Fast! Unique Puzzle Game

Real Maxwell LLC

Designed for iPad

    • 5.0 • 9 Ratings
    • Free
    • Offers In-App Purchases



Fun! Fast! Free! Unique!
Start a chain reaction that will clear all the O's from the screen -> ONO (no O's).
A new type of puzzle game. Like Sudoku without numbers. Wordle without letters.
Starting with the simplest forms + rules, complexity and variety emerge as elements are added.
A fun easy way to work on your clarity, focus and working memory.

24 levels from very easy to very hard. Master each level by solving 4 puzzles - you are allowed three tries in each of the first two, two tries in the next and, finally, you must solve one puzzle in a single try. The level is then open for free play with three tries forever. 
Ads only required for bonus rewards (but please get some rewards, we are both rewarded): 
You have an opportunity to watch a :30 ad to unlock a level, additional stickers, and/or to get 2X points to help you run up your score. 
Unlock everything for just 99¢!
Larger levels have 1000's of puzzle variations making ONO a game you can play over & over.
*Hat tip to "A Thousand Brains" by Jeff Hawkins for game inspiration, you should buy this book.

What’s New

Version 2.0.1

Version 2.0!! Fun! Fast! Free! Unique!
New - eliminated O's reveal changeable graphic directional "stickers". Optimized opening tutorial to get players into puzzles more quickly.
Optimized battery and cpu usage.

Ratings and Reviews

5.0 out of 5
9 Ratings

9 Ratings

Bigtoga ,

Fun, addictive

Lots of fun - takes a bit to figure out some of the levels (which I enjoy) but there is a “style” (if you will) that ultimately you will notice/see after 20-30 minutes. Perfect for those of us who want to just quickly go deep into a fun puzzle based game.

GulliverFoyle ,

Thinking can be tough!!!

The first time I played this I was hooked. The first time I ever got a one shot cleanup I was on top of the world, ma! Some of these look so simple until you’re left with 3 or 4 hanging. Good luck!

Dockrocker 1 ,


Great brain fog game. I play it for a few minutes in the morning to crank my ADHD brain up for work.

App Privacy

The developer, Real Maxwell LLC, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Purchases
  • Location
  • Identifiers
  • Usage Data
  • Other Data

Data Linked to You

The following data may be collected and linked to your identity:

  • Purchases
  • Location
  • Identifiers
  • Usage Data
  • Diagnostics
  • Other Data

Data Not Linked to You

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

  • User Content

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


  • Game Center

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  • Family Sharing

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

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