# Mysterious Creatures vs 石臼

The clearest difference is update cadence: 石臼 at every 5 weeks against Mysterious Creatures's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mysterious Creatures ships an update every 4 months, 石臼 every 5 weeks. The most recent releases landed on September 11, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | Mysterious Creatures | 石臼 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (5 ratings)](https://appshunter.io/ios/app/mysterious-creatures/id457832536/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Ad-supported | — |
| Size | 13 MB | 124 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masakazu Yonehara](https://appshunter.io/developer/1339210794) | [Hirokazu Oshimo](https://appshunter.io/developer/1627742277) |

## What reviewers say

### Mysterious Creatures

[App page](https://appshunter.io/ios/app/mysterious-creatures/id457832536)

Engage in a unique seek-and-find experience by sifting through virtual shirasu to discover hidden sea creatures. Collect a variety of miniature marine life, from baby shrimp to tiny squid, and build your personal collection of these elusive finds.

**Highlights:** Sift through virtual shirasu, Discover hidden sea creatures, Collect miniature marine life, Build a personal collection, Hint system for assistance, Save game progress

**Features:** macOS Compatibility

**In-app purchases:** none


### 石臼

[App page](https://appshunter.io/ios/app/ishiusu/id6477419440)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mysterious Creatures free?

Mysterious Creatures is free to download, with no in-app purchases.

### Is 石臼 free?

石臼 is free to download, with no in-app purchases.

### Do Mysterious Creatures or 石臼 have ads?

Both Mysterious Creatures and 石臼 show ads.

### Which is updated more often, Mysterious Creatures or 石臼?

Mysterious Creatures ships an update every 4 months, and 石臼 every 5 weeks. Most recently, Mysterious Creatures was updated on September 11, 2026 and 石臼 on August 19, 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.*