# Undersea Mahjong vs Brain training. Remember seq

The clearest difference is in-app purchases: Brain training. Remember seq at none against Undersea Mahjong's 6. Brain training. Remember seq also leads on iOS requirement (8.1 vs 12.0). Undersea Mahjong's advantage is update cadence (every 3 months vs every 17 months). On price, ads and device support there is nothing between them.

Both are free to download. Undersea Mahjong sells 6 one-off in-app purchases. Brain training. Remember seq asks for nothing beyond the download.

Undersea Mahjong ships an update every 3 months, Brain training. Remember seq every 17 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Undersea Mahjong | Brain training. Remember seq |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/undersea-mahjong/id748612885/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 3 months** | Every 17 months |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 64 MB |
| Requires iOS | 12.0 | **8.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Code This Lab srl](https://appshunter.io/developer/377003842) | [Ruslan Goncharenko](https://appshunter.io/developer/934710362) |

## What reviewers say

### Undersea Mahjong

[App page](https://appshunter.io/ios/app/undersea-mahjong/id748612885)

A classic matching puzzle game where you clear the board by pairing identical tiles. Explore various themes and unlock new game modes to keep the challenge fresh. Compete with others through leaderboards and achievements.

**Highlights:** Classic Mahjong matching gameplay, Multiple game modes including Memory, Over 30 themed layouts, Three difficulty levels, Multi-language support, Leaderboards and achievements

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| New 7 Wonders Layout | $0.99 | one-time |
| Disable Ads | $0.99 | one-time |
| Six New Layouts | $0.99 | one-time |
| New Six Winter Layout | $0.99 | one-time |
| Coins Pack | $1.99 | one-time |
| 100 coins, disable Ads, your name in the credits! | $2.99 | one-time |


### Brain training. Remember seq

[App page](https://appshunter.io/ios/app/brain-training-remember-seq/id1033117188)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Undersea Mahjong free?

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

### Is Brain training. Remember seq free?

Brain training. Remember seq is free to download, with no in-app purchases.

### Do Undersea Mahjong or Brain training. Remember seq have ads?

Both Undersea Mahjong and Brain training. Remember seq show ads.

### Which is updated more often, Undersea Mahjong or Brain training. Remember seq?

Undersea Mahjong ships an update every 3 months, and Brain training. Remember seq every 17 months. Most recently, Undersea Mahjong was updated on November 1, 2026 and Brain training. Remember seq on November 2, 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.*