Rain City vs Prime Flow
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Rain City
Embark on a bizarre and exciting adventure as a cat searching for his sister in the perpetually rainy Rain City. Explore a mysterious world, solve puzzles, gather clues, and uncover the truth behind the endless rain.
- Story-driven adventure
- Puzzle solving
- Character interaction
- Minigames
- Memory and observation challenges
- Picture book-like graphics
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The game begins with the main character, a cat, who embarks to Rain City to find his sister. The story is both bizarre and exciting making players get lost in a mushroom field, search for a secret passage, and run experiments in a laboratory. The reason rain continues in Rain City is uncovered when players find his missing sister... Players control the main character to look for his sister in the city. The story moves along while meeting various characters, gathering information, solving puzzles, and clearing minigames. There are elements that test skills including memory and observation, and the many items that appear add to its appeal to the game. The picture book-like graphics and story about animals who live like humans will draw you in to the world of Rain City.
Prime Flow
Explore the fascinating world of prime numbers through a minimalist puzzle game. Learn number theory through engaging gameplay, discovering patterns and unlocking lore. Designed for calm concentration and a playful approach to mathematical concepts.
- Explore prime patterns
- Learn through experimentation
- Unlock progression and lore
- Track accomplishments
- Clean interface for concentration
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Prime Flow is a minimalist puzzle game built around one of the strangest structures in mathematics: prime numbers. Play by testing, predicting, and navigating prime patterns as the game teaches you to see number theory—through motion, rhythm, and discovery. What you can do • Explore prime patterns through fast, focused play • Learn by experimentation (no worksheets, no lectures) • Unlock progression and “Prime Lore” as you advance • Track accomplishments through achievements and milestones • Enjoy a clean interface designed for calm concentration Who it’s for • puzzle players who like logic and pattern recognition • students and teachers who want a playful way into primes • anyone who finds beauty in numbers Prime Flow doesn’t try to make math “easy.” It tries to make it fun.
Screenshots
Verdict
Rain City and Prime Flow both sit at 4.0 stars, but that hides the real split: 100% of Prime Flow's written reviews are positive against 51% of Rain City's. Prime Flow also leads on price ($0.99 vs $1.99). Rain City's advantage is ratings volume (72 vs 1) and device support (4 vs 2). On rating, ads, in-app purchases and monetization model 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
Rain City costs $1.99 and Prime Flow $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.0 for Rain City against 4.0 for Prime Flow. That said, the two scores are not equally well evidenced: Rain City has 72 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 51% of Rain City's written reviews are positive against 100% of Prime Flow's.
| Parameter | Rain City | Prime Flow |
|---|---|---|
| Price | $1.99 | $0.99 — better |
| Rating | 4.0 (72 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 51.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 72 — better | 1 |
| Update frequency | Every 9 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 26.1 |
| Further details — not scored | ||
| Size | 261 MB | 194 MB |
| Age rating | 12+ | 4+ |
| Developer | COTTONGAME Network Technology Co., Ltd. | Ben Bedard |
Customer experience
Rain City
Prime Flow
Bugs and requests
Rain City
Reported bugs
12 issues- Character gets stuck on objects/walls
- Cat disappears in drain, blocking progress
- Boss battle controls not working with controller
- Automatically sent out of jail camera room
- Bug preventing progress in jail section (apple for rat)
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- Cat gets stuck when walking clockwise above sewer
- Remote controlled car bug in factory
- Game freezes
- Cannot download after purchase
- Elevator bug in underground mine
- Dialogue text cut off
- Sound and music missing
Requested features
9 requests- Add a skip option for arcade games
- Improve character movement and controls
- Add a hint system for puzzles
- Improve English translation quality
- Add Thai language support
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- Option to turn off dialogue noise
- Better sound and music implementation
- Larger screen optimization for mobile
- More intuitive interaction system
Prime Flow
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Rain City
No in-app purchases
Prime Flow
No in-app purchases









