# Mad Tower Challenge vs Index Sums

The clearest difference is ads: Index Sums at none against Mad Tower Challenge's shown. Mad Tower Challenge's advantage is update cadence (every 8 days vs every 3 weeks) and iOS requirement (12.0 vs 17.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mad Tower Challenge ships an update every 8 days, Index Sums every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Mad Tower Challenge | Index Sums |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/index-sums/id6745894447/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 3 weeks |
| Monetization | — | Free |
| Size | 109 MB | 25 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Kaffu Games Hong Kong Limited](https://appshunter.io/developer/1715168733) | [ZORIX LLC](https://appshunter.io/developer/1814371874) |

## What reviewers say

### Mad Tower Challenge

[App page](https://appshunter.io/ios/app/mad-tower-challenge/id6745769912)

**Features:** macOS Compatibility

**In-app purchases:** none


### Index Sums

[App page](https://appshunter.io/ios/app/index-sums/id6745894447)

Engage your mind with a Japanese number logic puzzle. Fill grids based on row and column sums, using pure logic to reveal hidden patterns. Offers multiple difficulty levels and daily challenges for continuous mental stimulation.

**Highlights:** Row and column sum logic puzzles, Multiple difficulty levels, Daily challenges, Progress tracking and statistics, Offline play, Customizable themes, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mad Tower Challenge free?

Mad Tower Challenge is free to download, with no in-app purchases.

### Is Index Sums free?

Index Sums is free to download, with no in-app purchases.

### Do Mad Tower Challenge or Index Sums have ads?

Mad Tower Challenge shows ads; Index Sums does not.

### Which is updated more often, Mad Tower Challenge or Index Sums?

Mad Tower Challenge ships an update every 8 days, and Index Sums every 3 weeks. Most recently, Mad Tower Challenge was updated on October 25, 2026 and Index Sums on October 24, 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.*