Comparison

Ouroboros vs Donut Stack Sort

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

Head to head
About

Ouroboros

Connect block pieces to form loops and score points in this addictive puzzle game. Inspired by classic brain training challenges, it offers endless ways to test your logic and creativity. Unlock new themes and compete with friends on the global leaderboard.

Highlights
  • Connect block pieces
  • Form and complete loops
  • Offline play
  • Unlockable themes
  • Global leaderboard
  • Relaxing gameplay
Features
Read full description

Inspired by classic puzzle and brain training games such as pipes, Ouroboros is a unique brain training game that will challenge you to connect various block pieces to form as many loops as possible before filling up the board. Ouroboros is also the name of the mythical snake, symbol of eternal renewal. This ancient creature inspired our fun, addictive puzzle game that will constantly challenge you to think differently and create anew from destruction. Are you ready to take on the Ouroboros challenge? Download OUROBOROS now and play the game for free! ◆◆◆◆◆◆◆◆◆◆ How to play OUROBOROS: ► Place & connect blocks on the board. ► Create & complete loops. ► Earn points and progress as far as you can. Beware! As you progress further, limited space, randomly-placed tiles, and various obstacles will present new challenges to solve. ◆◆◆◆◆◆◆◆◆◆ What you’ll love in OUROBOROS: ◆ FREE to play! Start right now! Download the game and play it for free. The game is supported by ads. ◆ OFFLINE play Play anywhere, on the go, even if you don’t have an internet or WIFI connection available. ◆ EASY to learn! Place blocks & connect them. Create loops & Earn points ◆ ENDLESS ways to challenge your brain The challenge is endless. As long as you manage to clear enough space on the board, you’ll be able to progress. ◆ CREATE the biggest loops Be creative and find ways to connect the largest loops possible. ◆ RELAX and play at your own pace Pick it up anytime. Stop whenever you want. The game is a perfect time killer for those small breaks. ◆ INVITE your friends to play and challenge them to beat your score Compare how you are doing against your friends on the global leaderboard. ◆ BEAUTIFUL themes to unlock As you progress, you’ll unlock new backgrounds to customize the look and feel of the game. ◆◆◆◆◆◆◆◆◆◆ Any questions or comments? We’d love to hear from you. Contact us at: contact@oaplus.co Want to learn more about the game? Please visit: Website: https://www.oaplus.co Privacy: https://www.oaplus.co/privacy Follow us on social media: Facebook: https://www.facebook.com/oaplus.co/ Twitter: @oaplusstudio Big THANKS to all of you who are showing interest in our game. Download OUROBOROS now for free and challenge your brain to think anew. See you soon in the game!

About

Donut Stack Sort

A minimalistic puzzle game where players merge hexagonal number blocks to create higher numbers. This addictive game challenges your brain, improving memory, concentration, and reflexes.

Highlights
  • Hexagon number block merging
  • Mind-sharpening gameplay
  • Improves memory and concentration
  • Addictive puzzle experience
  • Minimalistic design
Features
Read full description

Minimalistic and elegantly designed hexa puzzle game which lets you think out of the box and sharpen your mind. Donut Hexa Sort is one of those addictive number merge games that’ll keep you entertained for hours. The goal is to drag and merge the same hexagon number blocks so they merge into higher numbers. You get to enjoy this amazing new hexagon number puzzle game while improving your memory, concentration levels and reflexes at the same time. Once you start playing it, you will absolutely get addicted to this hexagon puzzle game.

Screenshots

Ouroboros4 screens
Donut Stack Sort4 screens

Verdict

The call

Ouroboros and Donut Stack Sort both sit at 4.6 stars, but that hides the real split: 85% of Ouroboros's written reviews are positive against 26% of Donut Stack Sort's. Ouroboros also leads on in-app purchases (none vs 19). Donut Stack Sort's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). On price, rating 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. Donut Stack Sort sells 19 one-off in-app purchases. Ouroboros asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Ouroboros against 4.5 for Donut Stack Sort. That said, the two scores are not equally well evidenced: Donut Stack Sort has 168 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 85% of Ouroboros's written reviews are positive against 26% of Donut Stack Sort's.

UpkeepUpdate frequency

Ouroboros ships an update every 5 months, Donut Stack Sort every 3 weeks. Both last shipped on October 21, 2026.

Scorecard7 real differences · 3 level
Ouroboros versus Donut Stack Sort: the parameters behind the verdict, then further details
ParameterOuroborosDonut Stack Sort
PriceFreeFree
Rating4.6 (10 ratings) — better4.5 (168 ratings)
Positive reviews84.6% of reviews — better25.9% of reviews
Number of ratings10168 — better
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size111 MB429 MB
Age rating4+4+
DeveloperOA+ LLCTran Tien Thanh

Customer experience

Ouroboros

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews13 reviews
Positive84.6%
Neutral7.7%
Negative7.7%

Donut Stack Sort

All ratings167 ratings
Positive86.2%
Neutral2.4%
Negative11.4%
Written reviews54 reviews
Positive25.9%
Neutral16.7%
Negative57.4%

Bugs and requests

Ouroboros

Not enough reviews yet to summarise bugs or requests.

Donut Stack Sort

Reported bugs

9 issues
  • Ads freeze the game
  • Ads don't close
  • Ads appear mid-game and block screen
  • Purchased ad-free experience still has ads
  • In-app purchases not credited (e.g., coins)
Show 4 more
  • Levels don't change after reaching a certain point
  • Game freezes and requires restart
  • Transparent ad layer blocks gameplay
  • Levels are locked early on

Requested features

6 requests
  • More levels needed
  • Update the game with new content
  • Fix the ad issue
  • Improve ad removal value
  • Change or remove the white donut (hard to see)
Show 1 more
  • Add more lives/attempts

In-app purchases

None

Ouroboros

No in-app purchases

19 purchases

Donut Stack Sort

One-time19
  • Coin 1$0.99
  • Premium Skin 2$0.99
  • Premium Skin 1$0.99
Show 16 more
  • Remove ads$1.99
  • Super Spin$3.99
  • Ticket 1$3.99
  • Coin 2$4.99
  • No ads bundle$4.99
  • Mini Bundle$4.99
  • Piggy bank$4.99
  • Safe Pack$4.99
  • Ticket 2$7.99
  • Coin 3$9.99
  • One Plus One$9.99
  • Large Bundle$9.99
  • Ultimate Donut Pass$9.99
  • All bundle$19.99
  • Coin 4$29.99
  • Coin 5$49.99

Questions

Is Ouroboros free?
Ouroboros is free to download, with no in-app purchases.
Is Donut Stack Sort free?
Donut Stack Sort is free to download, with in-app purchases available.
Which has better reviews, Ouroboros or Donut Stack Sort?
Ouroboros is rated higher. Ouroboros averages 4.6 out of 5 from 10 ratings, while Donut Stack Sort averages 4.5 from 168 ratings.
Do Ouroboros or Donut Stack Sort have ads?
Ouroboros shows ads; Donut Stack Sort does not.
Which is updated more often, Ouroboros or Donut Stack Sort?
Ouroboros ships an update every 5 months, and Donut Stack Sort every 3 weeks. Most recently, Ouroboros was updated on October 21, 2026 and Donut Stack Sort on October 21, 2026.

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