ONO: Brain Fog 4+

Think Straight. Puzzle Game‪.‬

Real Maxwell LLC

Designed for iPad

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



Think straight with a new kind of puzzle that relies on your most basic brain functions - motion & prediction. Beneath the words of Wordle. Below the math of Sudoku.

Think straight.
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: You have an opportunity to watch a :30 ad to unlock a level and/or to get 2X points to help you run up your score. Larger levels have 1000's of puzzle variations making it a game you can play over & over.
*Hat tip to "A Thousand Brains" by Jeff Hawkins, you should buy this book.

What’s New

Version 1.055

Reduced total number of ads in game. Increased rewards: Early unlock now includes 2X Points!
iOS minimum 14.5
Levels now mastered in only 4 puzzles rather than 6 to allow you to progress to more challenging puzzle levels more quickly.
Any locked puzzle levels can be opened early + 2X points by watching a 30 second ad.

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.

Dockrocker 1 ,


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

Laurynanneliese ,


So much fun and rewarding to advance from puzzle to puzzle. Download it now!

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.

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Data Not Linked to You

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

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


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