# The Castle Path vs Fill One Line 3D

The clearest difference is price: Fill One Line 3D at Free against The Castle Path's $4.99. Fill One Line 3D also leads on iOS requirement (12.0 vs 15.0). The Castle Path's advantage is ads (none vs shown) and update cadence (every 7 months vs every 22 months). On in-app purchases and device support there is nothing between them.

Fill One Line 3D is free to download; The Castle Path costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

The Castle Path ships an update every 7 months, Fill One Line 3D every 22 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | The Castle Path | Fill One Line 3D |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/the-castle-path/id1559889135/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 7 months** | Every 22 months |
| Monetization | Paid | — |
| Size | 27 MB | 63 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sylvain Seccia](https://appshunter.io/developer/511618543) | [Phuong Ta](https://appshunter.io/developer/1466076556) |

## What reviewers say

### The Castle Path

[App page](https://appshunter.io/ios/app/the-castle-path/id1559889135)

Engage your mind with a puzzle game where strategic choices unlock paths through challenging levels. Navigate obstacles, manipulate the environment, and reach the treasure by selecting the correct route.

**Highlights:** Puzzle and anticipation gameplay, Environmental state modification, Obstacle-based level design, Switch-activated path clearing, Star collection for progression, 60 unique levels

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

**In-app purchases:** none


### Fill One Line 3D

[App page](https://appshunter.io/ios/app/fill-one-line-3d/id1590675459)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is The Castle Path free?

The Castle Path costs $4.99, with no in-app purchases.

### Is Fill One Line 3D free?

Fill One Line 3D is free to download, with no in-app purchases.

### Do The Castle Path or Fill One Line 3D have ads?

Fill One Line 3D shows ads; The Castle Path does not.

### Which is updated more often, The Castle Path or Fill One Line 3D?

The Castle Path ships an update every 7 months, and Fill One Line 3D every 22 months. Most recently, The Castle Path was updated on November 3, 2026 and Fill One Line 3D on November 7, 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.*