# Killer Sudoku by Sudoku.com vs Memory Trail

The clearest difference is in-app purchases: Memory Trail at none against Killer Sudoku by Sudoku.com's 1. Memory Trail also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Killer Sudoku by Sudoku.com sells 1 one-off in-app purchase. Memory Trail asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Killer Sudoku by Sudoku.com | Memory Trail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (219K ratings)](https://appshunter.io/ios/app/killer-sudoku-by-sudokucom/id1505735640/reviews)** | — |
| Number of ratings | **219K** | — |
| Positive reviews | 44.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 237 MB | 75 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Easybrain Ltd](https://appshunter.io/developer/1190815537) | [CITUAL Technologies OPC Private Limited](https://appshunter.io/developer/1814774143) |

## What reviewers say

### Killer Sudoku by Sudoku.com

[App page](https://appshunter.io/ios/app/killer-sudoku-by-sudokucom/id1505735640)

Engage your mind with this number puzzle game, offering thousands of levels and daily challenges. It provides a unique twist on classic sudoku with cage-based sum puzzles, suitable for all skill levels. Hints and notes are available to help you master the game.

**Highlights:** Thousands of Killer Sudoku levels, Daily challenges with unique trophies, Seasonal events for special medals, Hints and notes for assistance, Enhanced gameplay for all skill levels, Brain-training puzzles

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Killer Sudoku No Ads | $14.99 | one-time |

**What reviewers like**

- 👍 Challenging game
- 🚀 Great time-filler
- 💡 Unique take on Sudoku
- 👍 Enjoyable experience
- 👍 Solid game play

**What reviewers complain about**

- 🔍 Too many ads
- 🔍 Ads interrupt gameplay
- 🐛 Bugs and glitches
- 🔍 Excessive ads for free version
- 🔍 Ads disrupt concentration

**Reported bugs**

- Incorrect puzzle solutions
- Scoring and stats issues
- Screen orientation problems
- Game freezing and crashing
- Unresponsive controls

**Requested features**

- Option to toggle number combinations
- Ability to lock correct numbers
- Improved hint system
- Customizable font and color options
- Progress sync between devices


### Memory Trail

[App page](https://appshunter.io/ios/app/memory-trail/id6746741499)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Killer Sudoku by Sudoku.com free?

Killer Sudoku by Sudoku.com is free to download, with in-app purchases available.

### Is Memory Trail free?

Memory Trail is free to download, with no in-app purchases.

### Do Killer Sudoku by Sudoku.com or Memory Trail have ads?

Both Killer Sudoku by Sudoku.com and Memory Trail show ads.

### Which is updated more often, Killer Sudoku by Sudoku.com or Memory Trail?

Killer Sudoku by Sudoku.com ships an update every 2 months, and Memory Trail every 2 months. Most recently, Killer Sudoku by Sudoku.com was updated on November 8, 2026 and Memory Trail 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.*