# Sudoku S. vs Merge Stack

The clearest difference is iOS requirement: Sudoku S. at 11.0 against Merge Stack's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Sudoku S. ships an update every 5 weeks, Merge Stack every 2 months. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sudoku S. | Merge Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/sudoku-s/id1312566544/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 105 MB | 238 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [果林 欧](https://appshunter.io/developer/870092735) | [Kite Games](https://appshunter.io/developer/1878111512) |

## What reviewers say

### Sudoku S.

[App page](https://appshunter.io/ios/app/sudoku-s/id1312566544)

Engage in logic-based number puzzles with a clean interface and advanced hint system. Compete in daily challenges, earn XP, and climb leaderboards across multiple platforms. Offers various difficulty levels and game modes for continuous learning and fun.

**Highlights:** Advanced hint system with popular Sudoku techniques, Clean and clear design for touch screens, 10,000 puzzles in 5 difficulty levels, Two game modes: random game and daily challenge, Daily challenges with global leaderboards, Cross-platform play, Progress saving and resuming

**Features:** macOS Compatibility

**In-app purchases:** none


### Merge Stack

[App page](https://appshunter.io/ios/app/merge-stack-color-block/id6788709551)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sudoku S. free?

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

### Is Merge Stack free?

Merge Stack is free to download, with no in-app purchases.

### Do Sudoku S. or Merge Stack have ads?

Both Sudoku S. and Merge Stack show ads.

### Which is updated more often, Sudoku S. or Merge Stack?

Sudoku S. ships an update every 5 weeks, and Merge Stack every 2 months. Most recently, Sudoku S. was updated on November 4, 2026 and Merge Stack on October 31, 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.*