Comparison

Bond Breaker vs circloO

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

Head to head
About

Bond Breaker

Engage with atomic physics in this puzzle game where you start as a proton and build up to atoms and molecules. Utilize scientific tools like lasers and microscopes to manipulate matter and learn real-world physics concepts.

Highlights
  • Atomic and molecular simulation
  • Real-world physics principles
  • Interactive scientific tools
  • Educational gameplay
  • Bond formation and breaking mechanics
Features
Read full description

Pit yourself against atomic physics in Bond Breaker, a new puzzle game based on real nano-scale science. You start this game in the smallest way possible - as a single proton, without even a single atom to call your own. But with a little luck, and a lot of physical chemistry, you'll grow into an atoms, smash together into molecules, or break apart again using lasers, tunneling microscopes, and heat. Created by TestTubeGames and scientists at the CaSTL research center at UC Irvine, this is truly the most accurate physics engine to date. After all, what other game is correct down to the atomic level? When you make and break molecular bonds, you’ll encounter real forces and real physics. This isn’t just simple stuff, either! You'll learn about... The forces that bind molecules together How lasers can excite atoms Why water sticks together into drops What happens when you heat something up And much, much more. Simply put, this is the most fun you can have without buying your own Scanning Tunneling Microscope!

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!

Screenshots

Bond Breaker4 screens
circloO4 screens

Verdict

The call

The clearest difference is in-app purchases: Bond Breaker at none against circloO's 1. Bond Breaker also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). circloO's advantage is ratings volume (2.4K vs 14) and rating (4.8 vs 4.6). On price, review sentiment 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. Bond Breaker asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

circloO holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: circloO has 2.4K ratings behind it against 14, so its average is the more settled of the two. Written reviews split almost evenly too, at 89% and 89% positive.

UpkeepUpdate frequency

Bond Breaker ships an update every 2 weeks, circloO every 2 months. The most recent releases landed on September 6, 2026 and September 9, 2026 respectively.

Scorecard7 real differences · 3 level
Bond Breaker versus circloO: the parameters behind the verdict, then further details
ParameterBond BreakercircloO
PriceFreeFree
Rating4.6 (14 ratings)4.8 (2.4K ratings) — better
Positive reviews89.5% of reviews89.5% of reviews
Number of ratings142.4K — better
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better10
Further details — not scored
Size81 MB63 MB
Age rating4+4+
DeveloperTestTubeGamesFlorian van Strien

Customer experience

Bond Breaker

All ratings14 ratings
Positive85.7%
Neutral7.1%
Negative7.1%
Written reviews19 reviews
Positive89.5%
Neutral5.3%
Negative5.3%

circloO

All ratings2,357 ratings
Positive96.9%
Neutral1.4%
Negative1.7%
Written reviews133 reviews
Positive89.5%
Neutral3.0%
Negative7.5%

Bugs and requests

Bond Breaker

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

Bond Breaker

No in-app purchases

1 purchases

circloO

One-time1
  • Remove Ads$2.99

Questions

Is Bond Breaker free?
Bond Breaker is free to download, with no in-app purchases.
Is circloO free?
circloO is free to download, with in-app purchases available.
Which has better reviews, Bond Breaker or circloO?
circloO is rated higher. Bond Breaker averages 4.6 out of 5 from 14 ratings, while circloO averages 4.8 from 2.4K ratings.
Do Bond Breaker or circloO have ads?
circloO shows ads; Bond Breaker does not.
Which is updated more often, Bond Breaker or circloO?
Bond Breaker ships an update every 2 weeks, and circloO every 2 months. Most recently, Bond Breaker was updated on September 6, 2026 and circloO on September 9, 2026.

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