# 15 Puzzle Challenge. vs Citadel Solitaire

The clearest difference is ads: Citadel Solitaire at none against 15 Puzzle Challenge.'s shown. Citadel Solitaire also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.7). 15 Puzzle Challenge.'s advantage is ratings volume (1.4K vs 1) and iOS requirement (13.0 vs 18.4). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 15 Puzzle Challenge. sells 1 one-off in-app purchase and Citadel Solitaire sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Citadel Solitaire holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: 15 Puzzle Challenge. has 1.4K ratings behind it against 1, so its average is the more settled of the two.

15 Puzzle Challenge. ships an update every 4 months, Citadel Solitaire every 5 months. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 15 Puzzle Challenge. | Citadel Solitaire |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.4K ratings)](https://appshunter.io/ios/app/15-puzzle-challenge/id416789249/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/citadel-solitaire/id6748704392/reviews)** |
| Number of ratings | **1.4K** | 1 |
| Positive reviews | 63.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 105 MB | 12 MB |
| Requires iOS | **13.0** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Forsbit LLC](https://appshunter.io/developer/949205633) | [Vlad Feinstein](https://appshunter.io/developer/1756392392) |

## What reviewers say

### 15 Puzzle Challenge.

[App page](https://appshunter.io/ios/app/15-puzzle-challenge/id416789249)

Test your intelligence with this classic sliding tile puzzle. Arrange numbered tiles in order on a 4x4 grid by sliding them into the empty space. Compete globally with friends and other players through Game Center.

**Highlights:** Classic 15-piece sliding tile puzzle, Multiplayer mode via Game Center, Global leaderboards, Unique achievements, Social media sharing

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Turn Ads off | $0.99 | one-time |

**What reviewers like**

- 👍 Smooth and responsive tile movements
- 🧠 Challenging brain exercise
- 🕰️ Ability to track personal best times

**What reviewers complain about**

- 🔍 Leaderboard scores seem inaccurate
- 🔀 Accidental swipes leading to home screen
- 📺 Excessive ads interrupting gameplay
- 🐛 Occasional crashes and bugs

**Reported bugs**

- Game screen not loading properly on iPad
- Tile sliding not registering properly at times
- High scores being deleted after updates

**Requested features**

- Add ability to track number of times completed
- Introduce new puzzle modes like spirals or descending patterns
- Allow customization of tile colors and themes


### Citadel Solitaire

[App page](https://appshunter.io/ios/app/citadel-solitaire/id6748704392)

A refined card game offering classic solitaire strategy with a modern design. It's easy to learn but challenging to master, perfect for quick, relaxing play that rewards thoughtful moves.

**Highlights:** Classic Castle Solitaire gameplay, Smooth modern design, Intuitive tap or drag controls, Unlimited undo, Helpful hints, Stats and win streak tracking

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thank you! | $0.99 | one-time |
| Thank you very much! | $2.99 | one-time |
| Support tip | $9.99 | one-time |


## Frequently asked questions

### Is 15 Puzzle Challenge. free?

15 Puzzle Challenge. is free to download, with in-app purchases available.

### Is Citadel Solitaire free?

Citadel Solitaire is free to download, with in-app purchases available.

### Which has better reviews, 15 Puzzle Challenge. or Citadel Solitaire?

Citadel Solitaire is rated higher. 15 Puzzle Challenge. averages 4.7 out of 5 from 1.4K ratings, while Citadel Solitaire averages 5.0 from 1 ratings.

### Do 15 Puzzle Challenge. or Citadel Solitaire have ads?

15 Puzzle Challenge. shows ads; Citadel Solitaire does not.

### Which is updated more often, 15 Puzzle Challenge. or Citadel Solitaire?

15 Puzzle Challenge. ships an update every 4 months, and Citadel Solitaire every 5 months. Most recently, 15 Puzzle Challenge. was updated on October 21, 2026 and Citadel Solitaire on October 12, 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.*