Zero/Sum vs Sum Loop
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zero/Sum
Solve mathematical puzzles to uncover a cure for cancer in this unique puzzle game. Experience an 80s action movie-inspired storyline with live-action cinematics and a variety of fresh puzzle mechanics. Features daily challenges and time trials.
- Unique and original puzzle gameplay
- 80s action movie-inspired storyline
- Full motion video cinematics with real actors
- Variety of puzzle types (melting, number)
- Daily Challenge Mode with new puzzles
- Time Trial mode
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On the eve of discovering a mathematical cure for cancer, your mentor, Professor Claire Liddy, is murdered. Fortunately, before she died, the Professor was able to erase many of the plus and minus signs with her bloody hands, saving the cure from falling into the hands of her killers. Now it is up to you to fill back in the missing parts of the equation and resolve your professor's cure. It's up to you to cure cancer -- AGAIN! (It's a comedy). FEATURES - A completely UNIQUE and ORIGINAL puzzle game! - Puzzle gameplay that will make you feel and look SMART! - A thrilling, 80s ACTION MOVIE-inspired storyline! - Full motion video GREEN SCREEN cinematics! With REAL human ACTORS! - NO mention of CANDY or CUPCAKES or sweets of any kind in the story at all! - A variety of different puzzle types and mechanics to keep things FRESH (melting puzzles, number puzzles, and so much more)! - A Daily Challenge Mode featuring 10 NEW puzzles EVERY DAY! - Time Trial mode - try to beat your best time on RANDOM PUZZLES! - Completely INDEPENDENTLY developed and published! (Support your local punk band)! I ignored my newborn child to make this game, please ignore yours to play it!* *Note: I worked on the game every night after my son fell asleep, there is nothing more important to me than being a father. That being said, this game is a CLOSE second. Like neck and neck, really.
Sum Loop
A challenging puzzle game where players place blocks into overlapping loops to match displayed sums. Offers multiple solutions for each puzzle, providing replayability. Designed for quick, engaging gameplay.
- Match sums in overlapping loops
- Place blocks to solve puzzles
- Multiple solutions per puzzle
- Challenging gameplay
- Intuitive block placement
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Number will be added to all loops where the loops are overlapped. Put the blocks in the loops and match all the sums displayed above. There is more than 1 answer.
Screenshots
Verdict
The clearest difference is rating: Sum Loop at 5.0 against Zero/Sum's 4.2. Zero/Sum's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence 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
Both are free to download. Sum Loop sells 1 one-off in-app purchase. Zero/Sum asks for nothing beyond the download.
Sum Loop holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Zero/Sum has 27 ratings behind it against 1, so its average is the more settled of the two.
Zero/Sum ships an update every 2 months, Sum Loop every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Zero/Sum | Sum Loop |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (27 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 53.8% of reviews | — |
| Number of ratings | 27 — better | 1 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 973 MB | 9 MB |
| Age rating | 12+ | 4+ |
| Developer | Sean Kearney | Goro Sato |
Customer experience
Zero/Sum
Sum Loop
In-app purchases
Zero/Sum
No in-app purchases
Sum Loop
- Remove Ads$0.99









