A whole new kind of minimalist puzzle game!
Try it today!

Start a chain reaction that will clear all the O's from the screen. O-NO (no O's).
A simple but challenging cause and effect puzzle game that works your brain:
- predictive modeling
- pattern recognition
- working memory
- clarity / focus / attention

24 levels from very easy to very hard. Master each level by solving 6 puzzles - you are allowed three tries in each of the first three, two tries in the next two and, finally, you must solve one puzzle in a single try. The level is then open for free play with three tries forever. You have an opportunity to watch a :30 ad to get 2X points to help you run up your score. Larger levels have 1000's of puzzle variations.

What’s New

Version 1.012

Remove Ads and Unlock All Levels for $0.99

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.

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

    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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