# RiddleSum vs Killer Sudoku Unleashed

The clearest difference is in-app purchases: Killer Sudoku Unleashed at none against RiddleSum's 1. Killer Sudoku Unleashed also leads on update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RiddleSum sells 1 one-off in-app purchase. Killer Sudoku Unleashed asks for nothing beyond the download.

RiddleSum ships an update every 2 months, Killer Sudoku Unleashed every 3 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | RiddleSum | Killer Sudoku Unleashed |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (10 ratings)](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 20 MB | 23 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Dmitriy Romanov](https://appshunter.io/developer/689955162) | [Tseung Cheung](https://appshunter.io/developer/534977644) |

## What reviewers say

### RiddleSum

[App page](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443)

This number puzzle game challenges you to balance rows and columns by selecting the correct numbers. It offers a relaxing, clean design with hundreds of handcrafted puzzles to sharpen logic and mental math skills at your own pace.

**Highlights:** Hundreds of handcrafted puzzles, Clean and minimal design, Helpful hints, No timers, solve at your own pace, Daily brain workout, Logic and mental math training

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Killer Sudoku Unleashed

[App page](https://appshunter.io/ios/app/killer-sudoku-unleashed/id6523420694)

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

**In-app purchases:** none


## Frequently asked questions

### Is RiddleSum free?

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

### Is Killer Sudoku Unleashed free?

Killer Sudoku Unleashed is free to download, with no in-app purchases.

### Do RiddleSum or Killer Sudoku Unleashed have ads?

Both RiddleSum and Killer Sudoku Unleashed show ads.

### Which is updated more often, RiddleSum or Killer Sudoku Unleashed?

RiddleSum ships an update every 2 months, and Killer Sudoku Unleashed every 3 days. Most recently, RiddleSum was updated on October 24, 2026 and Killer Sudoku Unleashed on October 25, 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.*