# Concentration Game, 9Bubbles vs 脳トレの学校

The clearest difference is review sentiment: Concentration Game, 9Bubbles at 55% against 脳トレの学校's 0%. Concentration Game, 9Bubbles also leads on rating (4.4 vs 4.0) and update cadence (every 10 days vs every 6 weeks). 脳トレの学校's advantage is in-app purchases (none vs 4). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Concentration Game, 9Bubbles sells 4 one-off in-app purchases. 脳トレの学校 asks for nothing beyond the download.

Concentration Game, 9Bubbles holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Concentration Game, 9Bubbles has 46 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 55% of Concentration Game, 9Bubbles's written reviews are positive against 0% of 脳トレの学校's.

Concentration Game, 9Bubbles ships an update every 10 days, 脳トレの学校 every 6 weeks. The most recent releases landed on October 22, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Concentration Game, 9Bubbles | 脳トレの学校 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (46 ratings)](https://appshunter.io/ios/app/concentration-game-9bubbles/id1366569537/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/id1504050050/reviews) |
| Number of ratings | **46** | 1 |
| Positive reviews | **54.5% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 10 days** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 129 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lisfee, Inc.](https://appshunter.io/developer/1146331015) | [ZERONE](https://appshunter.io/developer/1708775781) |

## What reviewers say

### Concentration Game, 9Bubbles

[App page](https://appshunter.io/ios/app/concentration-game-9bubbles/id1366569537)

This game challenges your memory and concentration by requiring you to memorize and recall the colors and positions of bubbles. Designed to improve cognitive skills and creativity, it offers increasing difficulty across 28 stages.

**Highlights:** Memorize colors and positions, Burst bubbles based on memory, Improves memory power, Enhances creative ability, 28 challenging stages, Trains the right side of the brain

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FEEL GOOD | $1.99 | one-time |
| TRY STAGE28 | $1.99 | one-time |
| 10 LIFEs | $1.99 | one-time |
| DELETE ADs | $1.99 | one-time |


### 脳トレの学校

[App page](https://appshunter.io/ios/app/id1504050050)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Concentration Game, 9Bubbles free?

Concentration Game, 9Bubbles is free to download, with in-app purchases available.

### Is 脳トレの学校 free?

脳トレの学校 is free to download, with no in-app purchases.

### Which has better reviews, Concentration Game, 9Bubbles or 脳トレの学校?

Concentration Game, 9Bubbles is rated higher. Concentration Game, 9Bubbles averages 4.4 out of 5 from 46 ratings, while 脳トレの学校 averages 4.0 from 1 ratings.

### Do Concentration Game, 9Bubbles or 脳トレの学校 have ads?

Both Concentration Game, 9Bubbles and 脳トレの学校 show ads.

### Which is updated more often, Concentration Game, 9Bubbles or 脳トレの学校?

Concentration Game, 9Bubbles ships an update every 10 days, and 脳トレの学校 every 6 weeks. Most recently, Concentration Game, 9Bubbles was updated on October 22, 2026 and 脳トレの学校 on October 19, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*