# The Impossible Letter Game vs StacKing

The clearest difference is ads: StacKing at none against The Impossible Letter Game's shown. StacKing also leads on update cadence (every 3 weeks vs every 4 months) and iOS requirement (15.6 vs 17.1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. The Impossible Letter Game sells 4 one-off in-app purchases and StacKing sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

The Impossible Letter Game ships an update every 4 months, StacKing every 3 weeks. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | The Impossible Letter Game | StacKing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (17K ratings)](https://appshunter.io/ios/app/the-impossible-letter-game/id852152318/reviews)** | — |
| Number of ratings | **17K** | — |
| Positive reviews | 81.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 75 MB | 60 MB |
| Requires iOS | 17.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GammaLateral LLC](https://appshunter.io/developer/685178329) | [Phanidhar Reddy Kotala](https://appshunter.io/developer/6794400029) |

## What reviewers say

### The Impossible Letter Game

[App page](https://appshunter.io/ios/app/the-impossible-letter-game/id852152318)

Test your visual acuity and focus with this challenging puzzle game. It presents simple yet incredibly difficult levels designed to push your observational skills to the limit. Prepare for an extreme eye exercise.

**Highlights:** Extreme eye exercise, Challenging puzzles, Skill testing, Simple gameplay, Impossible levels

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get 30 Hints | $0.99 | one-time |
| Get 70 Hints | $1.99 | one-time |
| Get 120 Hints | $2.99 | one-time |
| Remove Ads | $9.99 | one-time |

**What reviewers like**

- 👍 Fun and challenging game
- 🧠 Helps improve focus and attention to detail
- 🎨 Visually appealing design
- 🕹️ Addictive gameplay

**What reviewers complain about**

- 🔍 Some levels are too difficult
- 🕰️ Timer continues running during ads
- 💰 Too many ads
- 🤕 Can strain the eyes

**Reported bugs**

- Inconsistent level difficulty
- Crashing and freezing issues

**Requested features**

- Option to skip difficult levels
- Pause timer during level transitions
- More game modes and level variety


### StacKing

[App page](https://appshunter.io/ios/app/stacking-drop-and-stack-tower/id6794803321)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Extra Lifes | $0.99 | one-time |
| No Ads | $1.99 | one-time |
| 30 Extra Lifes | $1.99 | one-time |
| 50 Extra Lifes | $2.99 | one-time |


## Frequently asked questions

### Is The Impossible Letter Game free?

The Impossible Letter Game is free to download, with in-app purchases available.

### Is StacKing free?

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

### Do The Impossible Letter Game or StacKing have ads?

The Impossible Letter Game shows ads; StacKing does not.

### Which is updated more often, The Impossible Letter Game or StacKing?

The Impossible Letter Game ships an update every 4 months, and StacKing every 3 weeks. Most recently, The Impossible Letter Game was updated on October 25, 2026 and StacKing on October 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.*