Circadia 4+

A simple puzzle‪?‬

Simple Machine, LLC

Designed for iPad

    • 4.6 • 10.6K Ratings
    • Free
    • Offers In-App Purchases



Tap dots and make all the rings hit the white dot at once.


Sure, keep telling yourself that.

Try it and see for yourself.

In 2011 Circadia was the first big hit game from Simple Machine, makers of Pop the Lock, Calculator: The Game, and _-_. Circadia went on to become a Starbucks App of the Week and gathered a bunch of great fans.

Try it and see how it inspired our path of making unique and innovative games.

And to our fans, ESPECIALLY the ones who downloaded Circadia way way back in the day. Thank you for supporting us and sticking with us. We love making games for you and will continue to!

This one is for you!

Team Simple Machine

What’s New

Version 2.1

This app has been updated by Apple to display the Apple Watch app icon.

Small tweaks and changes

Ratings and Reviews

4.6 out of 5
10.6K Ratings

10.6K Ratings

L8R4U ,


This game is so addictive!!! It's a brain buster too. You start with a colored sphere/circle and when you tap it, it releases a ring/band that expands in equal directions. It sounds stupid but it gets better. The objective is to get the bands of the colored spheres to intersect simultaneously over the white dot. Again stupid right? But some of the bands go at a lower speed while other go faster so you have to time it just right and as you go higher in each level the white dot starts to move so you have to time it just right. It's a puzzle and it seems so simple but it's not - the challenge of figuring out the right combination and working out the timing is what makes this a fun game and passing each level becomes addictive because you want to see what the next curve ball will be. Totally worth it and some fun sound effects too! Enjoy :-)!

Techno_Soldier ,

Relaxing, yet Intense. Your Brain will thank you!

I'm critical of all apps/games though this is a Beautifully well done Masterpiece! Download it, you will not put it down. Use Headphones for a brilliant environmental takeover and NEW SOUNDS. New In-App purchase options available so you can unlock all levels and not get stuck on one which frustrates you to the point of wanting to hurl your i-device and yourself out of the nearest window. What's this clever infinity mode? Find out! Endless possibilities. How can one game be so silky relaxing AND pulse-driven intense? Minimalism at its most skeletal perfection!
•I don't write Reviews but this is an exception to the rule.

Amazing Developer, Cute, Humble, took time & love from Fans to improve an already 5 star game. Thank You so much 👏 Cyber Hug to you!
~From Texas with Love!

DocCrypton ,

Feast for the Senses

All movement on your screen is smooth and satisfying. Relaxing. Sounds are like the soothing single notes of a xylophone. When you achieve the goal of each level, the two notes combine realistically to create a pleasant combined tone. Same concept with the colors you see. Each circle is a rich shade of all the familiar colors of the rainbow. When each level is complete, the colors combine realistically, as if mixed on a palette. However, when your target starts moving, you cease to be indulged. Then you have to actually WORK for your goal! Every level is worth the effort.


App Privacy

The developer, Simple Machine, LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


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Pop the Lock
Calculator: The Game
Calculator 2: The Game

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