Comparison

circloO vs Sleepy Planets

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

circloO

A colorful physics platformer where you guide a ball through growing circular levels. Collect circles to expand the play area, strategically using and avoiding obstacles. Discover unique physics mechanics and enjoy a vast collection of player-created levels.

Highlights
  • Circular physics puzzles
  • Level editor
  • Player-created levels
  • Unique physics mechanics
  • Growing levels
  • Hard Mode levels
Read full description

circloO is a colorful physics platformer in a growing circle. This app version contains all levels from circloO and circloO 2, plus brand-new bonus levels! There's also a level editor and already over 10,000 levels created by players like you! You're a small ball rolling around in a round level. Collect circles to grow the level circle. As it grows, everything stays in the level, so you'll have to avoid and use obstacles in everchanging ways. For example, a platform that was first very useful to gain height, may prove to be a challenging obstacle after the level has grown! You can only move left and right, so you'll want to use features of the level carefully to jump and gain height. You'll discover all sorts of physics features, such as changing gravity, a sea of tiny blocks, strange contraptions and even planets with a gravity field. In challenging parts, you'll find yourself fully immersed, pressing the screen as hard as you can trying to get closer to finally collecting that next circle. But don't worry: you'll never have to start over a level, so you can always try again really quickly! And I can guarantee you'll feel amazing once you finally manage it! circloO Complete features: - Lots of cool physics features: ropes, pulleys, changing gravity and much more! I've included quite a few mechanics for you to discover. - Over 75 fun, growing, ever more challenging levels! Can you complete the six almost-but-not-quite-impossible Hard Mode levels? - There's also a level editor and an ever increasing number of player created levels! - All levels from circloO 2 and the original circloO, plus 28 brand-new levels! - Unique physics puzzles in each level. - Great music and sound effects by Stijn Cappetijn. - Minimalist and colorful graphics. - The game will take most players three to five hours to complete. Level times are saved, so you can try to beat your own highscores and speedrun levels after that! Plus there are thousands of player-created levels to continue playing forever! - Relaxing yet challenging physics puzzle platforming fun! I'm very happy that circloO 2 on the web won the first Crazy Games developer contest out of 200 contestants! It was also third in the Kongregate contest of November 2018. You may remember it from CoolMath Games as well. Reviews: "It’s an excellent game that has a very playful and chilled out approach to the gameplay, whilst also featuring some wonderfully intricate level design. A very impressive puzzle platformer you’ll really want to roll with. Highly recommended." - Free Game Planet "The difficulty scales upwards nicely and you're constantly rewarded for learning new skills as these always come up in future levels." - Jayisgames The game contains occasional ads after a level, which can be removed with a one-time in-app purchase, which supports development as well. Have fun and I'm happy to hear what you think!

About

Sleepy Planets

Features
Read full description

Your goal is to create a perfect eclipse so the sleepy planets can finally rest in the shade. But it’s not that simple — moving one planet can disturb the others. Solve 50 carefully crafted levels, each more challenging than the last. For true players, there's also an intense Time Mode with its own global leaderboard!

Screenshots

circloO4 screens
Sleepy Planets4 screens

Verdict

The call

The clearest difference is update cadence: circloO at every 2 months against Sleepy Planets's every 27 months. circloO also leads on iOS requirement (10 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. circloO sells 1 one-off in-app purchase and Sleepy Planets sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

circloO ships an update every 2 months, Sleepy Planets every 27 months. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 8 level
circloO versus Sleepy Planets: the parameters behind the verdict, then further details
ParametercircloOSleepy Planets
PriceFreeFree
Rating4.8 (2.4K ratings) — better—
Positive reviews89.5% of reviews—
Number of ratings2.4K — better—
Update frequencyEvery 2 months — betterEvery 27 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10 — better13.0
Further details — not scored
Size63 MB96 MB
Age rating4+4+
DeveloperFlorian van StrienNikola Jovanovic

Bugs and requests

circloO

Reported bugs

2 issues
  • Glitches with level progression
  • Inconsistent touch/click registration

Requested features

4 requests
  • More levels and content updates
  • Character customization options
  • Improved level editor tools
  • Difficulty settings or options

Sleepy Planets

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

circloO

One-time1
  • Remove Ads$2.99
1 purchases

Sleepy Planets

One-time1
  • Remove Ads$0.99

Questions

Is circloO free?
circloO is free to download, with in-app purchases available.
Is Sleepy Planets free?
Sleepy Planets is free to download, with in-app purchases available.
Do circloO or Sleepy Planets have ads?
Both circloO and Sleepy Planets show ads.
Which is updated more often, circloO or Sleepy Planets?
circloO ships an update every 2 months, and Sleepy Planets every 27 months. Most recently, circloO was updated on October 17, 2026 and Sleepy Planets on October 11, 2026.

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