# Mermaid Hidden Objects vs Poly Worlds

The clearest difference is in-app purchases: Poly Worlds at none against Mermaid Hidden Objects's 4. Poly Worlds also leads on update cadence (weekly vs every 52 months). Mermaid Hidden Objects's advantage is ads (none vs shown) and iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Mermaid Hidden Objects sells 4 one-off in-app purchases. Poly Worlds asks for nothing beyond the download.

Mermaid Hidden Objects ships an update every 52 months, Poly Worlds weekly. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Mermaid Hidden Objects | Poly Worlds |
| --- | --- | --- |
| 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** | Yes |
| Update frequency | Every 52 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 192 MB | 191 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [John Smith](https://appshunter.io/developer/483881207) | [BugFix Games Entertainment](https://appshunter.io/developer/1689361525) |

## 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 |


### Poly Worlds

[App page](https://appshunter.io/ios/app/poly-worlds-hidden-object/id6749450133)

**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 Poly Worlds free?

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

### Do Mermaid Hidden Objects or Poly Worlds have ads?

Poly Worlds shows ads; Mermaid Hidden Objects does not.

### Which is updated more often, Mermaid Hidden Objects or Poly Worlds?

Mermaid Hidden Objects ships an update every 52 months, and Poly Worlds weekly. Most recently, Mermaid Hidden Objects was updated on October 17, 2026 and Poly Worlds on October 10, 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.*