# 99 Problems vs Monster Challenge!

The clearest difference is in-app purchases: Monster Challenge! at none against 99 Problems's 1. Monster Challenge! also leads on ratings volume (10K vs 38) and update cadence (every 3 weeks vs every 3 months). 99 Problems's advantage is ads (none vs shown) and review sentiment (74% vs 56%). On price, rating and device support there is nothing between them.

Both are free to download. 99 Problems sells 1 one-off in-app purchase. Monster Challenge! asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.3 for 99 Problems against 4.4 for Monster Challenge!. That said, the two scores are not equally well evidenced: Monster Challenge! has 10K ratings behind it against 38, so its average is the more settled of the two. Written reviews are what separate them: 74% of 99 Problems's written reviews are positive against 56% of Monster Challenge!'s.

99 Problems ships an update every 3 months, Monster Challenge! every 3 weeks. The most recent releases landed on September 7, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 99 Problems | Monster Challenge! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (38 ratings)](https://appshunter.io/ios/app/99-problems/id911710597/reviews) | **[4.4 (10K ratings)](https://appshunter.io/ios/app/monster-challenge/id1601575661/reviews)** |
| Number of ratings | 38 | **10K** |
| Positive reviews | **74.2% of reviews** | 55.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 24 MB | 225 MB |
| Requires iOS | **6.1** | 12.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Mamau ApS](https://appshunter.io/developer/1079859475) | [Loi Le](https://appshunter.io/developer/1210400461) |

## What reviewers say

### 99 Problems

[App page](https://appshunter.io/ios/app/99-problems/id911710597)

Navigate a minimalist world through 99 challenging levels. Evade obstacles and wall-jump your way to victory in this addictive hardcore game. Experience a seamless stream of challenges designed for maximum fun.

**Highlights:** 99 challenging levels, Minimalist design, Obstacle evasion, Wall-jumping mechanics, Hardcore fun

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


### Monster Challenge!

[App page](https://appshunter.io/ios/app/monster-challenge/id1601575661)

Embark on an engaging gaming adventure with numerous levels designed to help you relax and de-stress. Experience a fun and immersive world that offers a great escape from daily pressures.

**Highlights:** Multiple game levels, Stress relief, Escape gameplay, Immersive experience

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Fun game
- 🤩 Enjoyable characters
- 💡 Interesting gameplay

**What reviewers complain about**

- 🙄 Annoying ads
- 🤔 Confusing mechanics
- 👎 Ugly characters

**Reported bugs**

- Crashes on older devices
- Unlocking issues

**Requested features**

- Remove ads
- Improve tutorial
- Add more levels


## Frequently asked questions

### Is 99 Problems free?

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

### Is Monster Challenge! free?

Monster Challenge! is free to download, with no in-app purchases.

### Which has better reviews, 99 Problems or Monster Challenge!?

Monster Challenge! is rated higher. 99 Problems averages 4.3 out of 5 from 38 ratings, while Monster Challenge! averages 4.4 from 10K ratings.

### Do 99 Problems or Monster Challenge! have ads?

Monster Challenge! shows ads; 99 Problems does not.

### Which is updated more often, 99 Problems or Monster Challenge!?

99 Problems ships an update every 3 months, and Monster Challenge! every 3 weeks. Most recently, 99 Problems was updated on September 7, 2026 and Monster Challenge! on September 22, 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.*