# Mermaid Hidden Objects vs Happy Penguins 3D

The clearest difference is in-app purchases: Happy Penguins 3D at none against Mermaid Hidden Objects's 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mermaid Hidden Objects sells 4 one-off in-app purchases. Happy Penguins 3D asks for nothing beyond the download.

Mermaid Hidden Objects ships an update every 52 months, Happy Penguins 3D every 43 months. The most recent releases landed on October 24, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Mermaid Hidden Objects | Happy Penguins 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (3 ratings)](https://appshunter.io/ios/app/mermaid-hidden-objects/id1225357568/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 52 months | **Every 43 months** |
| Monetization | Free with in-app purchases | — |
| Size | 192 MB | 77 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [John Smith](https://appshunter.io/developer/483881207) | [PAMPAM, TOV](https://appshunter.io/developer/1435908728) |

## What reviewers say

### Mermaid Hidden Objects

[App page](https://appshunter.io/ios/app/mermaid-hidden-objects/id1225357568)

Explore enchanting underwater scenes filled with mermaids and ocean life. Search for hidden treasures, jewels, and seashells across various levels. Utilize hints and zoom features to aid your search, with the option to skip challenging levels and replay them later with new object arrangements.

**Highlights:** Underwater mermaid and ocean scenes, Find hidden treasures and jewels, Hint and zoom functionality, Skip levels and replay, Unlockable levels with new objects

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hint object | $0.99 | one-time |
| Skip level | $0.99 | one-time |
| Unlock all levels | $1.99 | one-time |
| Remove Ads | $1.99 | one-time |


### Happy Penguins 3D

[App page](https://appshunter.io/ios/app/happy-penguins-3d/id1508310564)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mermaid Hidden Objects free?

Mermaid Hidden Objects is free to download, with in-app purchases available.

### Is Happy Penguins 3D free?

Happy Penguins 3D is free to download, with no in-app purchases.

### Do Mermaid Hidden Objects or Happy Penguins 3D have ads?

Neither Mermaid Hidden Objects nor Happy Penguins 3D shows ads.

### Which is updated more often, Mermaid Hidden Objects or Happy Penguins 3D?

Mermaid Hidden Objects ships an update every 52 months, and Happy Penguins 3D every 43 months. Most recently, Mermaid Hidden Objects was updated on October 24, 2026 and Happy Penguins 3D on September 14, 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.*