# Sum Fun vs Killer Sudoku

The clearest difference is review sentiment: Sum Fun at 100% against Killer Sudoku's 39%. Sum Fun also leads on in-app purchases (none vs 6) and rating (4.9 vs 4.7). Killer Sudoku's advantage is ratings volume (27K vs 33). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Killer Sudoku sells 6 in-app purchases, starting at $1.99 per 7 days. Sum Fun asks for nothing beyond the download.

Sum Fun holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Killer Sudoku has 27K ratings behind it against 33, so its average is the more settled of the two. Written reviews point the same way: 100% of Sum Fun's written reviews are positive against 39% of Killer Sudoku's.

Sum Fun ships an update every 10 days, Killer Sudoku weekly. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Sum Fun | Killer Sudoku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (33 ratings)](https://appshunter.io/ios/app/sum-fun/id817544892/reviews)** | [4.7 (27K ratings)](https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340/reviews) |
| Number of ratings | 33 | **27K** |
| Positive reviews | **100.0% of reviews** | 39.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 181 MB | 253 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Sharpe](https://appshunter.io/developer/817544895) | [Oakever Games](https://appshunter.io/developer/1658671470) |

## What reviewers say

### Sum Fun

[App page](https://appshunter.io/ios/app/sum-fun/id817544892)

A unique number puzzle game that combines logic, numbers, and strategy. Enjoy endlessly replayable puzzles with creative board shapes and a brain-boosting gameplay experience. Play at your own pace with no time limits and challenge friends.

**Highlights:** Unique number puzzle gameplay, Variety of creative board shapes, Brain-boosting mental workout, No time limits for relaxed play, Challenge friends offline, Easy to play, fun to master

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

**In-app purchases:** none


### Killer Sudoku

[App page](https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340)

Engage your mind with a logic-based number puzzle game. Place digits 1-9 into grids, ensuring each appears once per row, column, and mini-grid. Enjoy daily challenges, customizable themes, and intelligent hints for a brain-boosting experience.

**Highlights:** Multiple difficulty levels, Daily challenges and trophies, Pencil mode for notes, Highlight duplicate numbers, Intelligent hint system, Customizable themes, Unlimited undo/redo

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sudoku Weekly Subscription | $1.99 | per 7 days |
| Sudoku Monthly Subscription | $4.99 | per month |
| Sudoku Yearly Subscription | $15.99 | per year |
| Battle Tickets *30 | $0.99 | one-time |
| Battle Tickets *100 | $1.99 | one-time |
| Battle Tickets *200 | $2.99 | one-time |

**What reviewers like**

- 🚀 Great game
- 💡 Challenging and makes you think
- 👍 Variety and challenge
- 👍 Stimulating brain workout

**What reviewers complain about**

- 🐛 Freezing and crashing issues
- 🔋 Battery drain
- 💸 Too many intrusive ads
- 💸 Expensive subscription to remove ads
- 🐛 Bugs and glitches

**Reported bugs**

- Game freezing and crashing
- Ads causing issues and preventing gameplay
- Losing progress and data after updates
- Numbers not showing up in puzzles
- Battle mode bugs and glitches

**Requested features**

- Option to turn off timer
- More note-taking options
- Ability to choose difficulty level for daily challenges
- Bring back seasonal challenges
- Improve battle mode matchmaking and ad issues


## Frequently asked questions

### Is Sum Fun free?

Sum Fun is free to download, with no in-app purchases.

### Is Killer Sudoku free?

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

### Which has better reviews, Sum Fun or Killer Sudoku?

Sum Fun is rated higher. Sum Fun averages 4.9 out of 5 from 33 ratings, while Killer Sudoku averages 4.7 from 27K ratings.

### Do Sum Fun or Killer Sudoku have ads?

Both Sum Fun and Killer Sudoku show ads.

### Which is updated more often, Sum Fun or Killer Sudoku?

Sum Fun ships an update every 10 days, and Killer Sudoku weekly. Most recently, Sum Fun was updated on October 23, 2026 and Killer Sudoku on October 26, 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.*