# SOINSU math puzzle vs HydrogenGame

The clearest difference is price: SOINSU math puzzle at Free against HydrogenGame's $2.99. HydrogenGame's advantage is in-app purchases (none vs 2) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

SOINSU math puzzle is free to download; HydrogenGame costs $2.99 up front. SOINSU math puzzle sells 2 one-off in-app purchases. HydrogenGame asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 17, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SOINSU math puzzle | HydrogenGame |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 105 MB | 89 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GAIBAKO co., Ltd.](https://appshunter.io/developer/1548482925) | [Akihiro Kakoi](https://appshunter.io/developer/1738811085) |

## What reviewers say

### SOINSU math puzzle

[App page](https://appshunter.io/ios/app/soinsu-math-puzzle/id6444055103)

Engage in a brain-training puzzle game focused on prime factorization. Anyone can learn the fun of numbers through this simple, time-killing activity. Enjoy the challenge of dividing numbers into prime factors with a high-tempo soundtrack.

**Highlights:** Prime factorization gameplay, Brain training puzzles, Mental arithmetic practice, Cyber visuals, Trance music soundtrack, Multiple game modes, Prime number collection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add no time limit mode | $0.99 | one-time |
| Hidden Ads | $2.99 | one-time |


### HydrogenGame

[App page](https://appshunter.io/ios/app/hydrogengame/id6480367458)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SOINSU math puzzle free?

SOINSU math puzzle is free to download, with in-app purchases available.

### Is HydrogenGame free?

HydrogenGame costs $2.99, with no in-app purchases.

### Do SOINSU math puzzle or HydrogenGame have ads?

SOINSU math puzzle shows ads; HydrogenGame does not.

### Which is updated more often, SOINSU math puzzle or HydrogenGame?

SOINSU math puzzle ships an update weekly, and HydrogenGame weekly. Most recently, SOINSU math puzzle was updated on October 17, 2026 and HydrogenGame on October 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*