Zero Below Zero vs o
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zero Below Zero
A challenging puzzle game with simple mechanics but extreme difficulty. Achieve a perfect score on free levels to unlock the rest at no cost. No hints are provided, requiring strategic thinking to solve each unique circle-based puzzle.
- Extremely challenging gameplay
- Unique circle-based puzzles
- Free levels unlockable
- No hints provided
- Inspired by math puzzles
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Don’t let the cute graphics deceive you - this game is HARD. It’s so difficult, that if you get a perfect score on the free levels, you get the rest of the levels for free. The goal sounds easy - all you have to do is make each circle at least zero. The trouble is there are gazillions of moves you can make, and just one will give you a perfect score. Oh, and there are no hints. There are also no ads, subscriptions, tracking, or anything else you wouldn’t want. If you can’t achieve a perfect score on the free levels, you can always admit defeat and pay to unlock the other levels ;) This game is inspired by the dollar game maths puzzle as seen on Numberphile. Don’t expect that to help you though - Zero Below Zero has been made much more difficult!
o
A tactical turning strategy game where players rotate discs to chain colors and clear lines for high scores. Earn perks like Rewind and Bombs to enhance gameplay. Designed with minimalist aesthetics and a calming soundtrack, it offers a challenging yet relaxing experience.
- Disc rotation for color chaining
- Perk system for enhanced gameplay
- Minimalist design and ambient soundtrack
- Leaderboard challenges
- Achievement system
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The essential turning point strategy game! Keep the board moving as you rotate discs to chain colors, connect corners and rack up high scores. Keep a level head under pressure as you clear as many lines as possible. Earn perks to improve your chances, including Rewind giving you a second shot, Rainbow to chain with any color, and Bombs to clear out the board. Combine perks and discover new tactics - drop a Rainbow and Rewind for better placement, or Rewind drop a Bomb? The choice is yours. Thoughtfully designed with minimalist aesthetics and a rich ambient soundtrack, unwind while keeping your brain and body sharp. Easy to play, but difficult to master - what strategy will you choose? ----- Why you'll love o-o-o: - No in-app purchases! - No adverts! - Minimalist and thoughtful design - Deep, rich ambience and sound effects - Challenge friends - Climb the leaderboards - Earn achievements
Screenshots
Verdict
The clearest difference is in-app purchases: o at none against Zero Below Zero's 1. o also leads on update cadence (every 5 days vs every 6 months) and iOS requirement (11.0 vs 14.3). On price, rating, review sentiment and ratings volume 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
Both are free to download. Zero Below Zero sells 1 one-off in-app purchase. o asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Zero Below Zero against 5.0 for o. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Zero Below Zero ships an update every 6 months, o every 5 days. The most recent releases landed on June 1, 2026 and September 13, 2026 respectively.
| Parameter | Zero Below Zero | o |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 6 — better | 3 |
| Update frequency | Every 6 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.3 | 11.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 247 MB |
| Age rating | 4+ | 4+ |
| Developer | Omar Fahmy | Play XD Ltd. |
Customer experience
Zero Below Zero
o
In-app purchases
Zero Below Zero
- Unlock all levels$3.99
o
No in-app purchases
