# Concentration Game, 9Bubbles vs イニシャルクイズ

The clearest difference is in-app purchases: イニシャルクイズ at none against Concentration Game, 9Bubbles's 4. Concentration Game, 9Bubbles's advantage is review sentiment (55% vs 20%) and update cadence (every 10 days vs every 5 weeks). 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. イニシャルクイズ asks for nothing beyond the download.

Concentration Game, 9Bubbles ships an update every 10 days, イニシャルクイズ every 5 weeks. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Concentration Game, 9Bubbles | イニシャルクイズ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (45 ratings)](https://appshunter.io/ios/app/concentration-game-9bubbles/id1366569537/reviews)** | — |
| Number of ratings | **45** | — |
| Positive reviews | **54.5% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 10 days** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 143 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) | [FUKUROU](https://appshunter.io/developer/1603805098) |

## 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 |


### イニシャルクイズ

[App page](https://appshunter.io/ios/app/id1504050318)

**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 イニシャルクイズ free?

イニシャルクイズ is free to download, with no in-app purchases.

### Do Concentration Game, 9Bubbles or イニシャルクイズ have ads?

Both Concentration Game, 9Bubbles and イニシャルクイズ show ads.

### Which is updated more often, Concentration Game, 9Bubbles or イニシャルクイズ?

Concentration Game, 9Bubbles ships an update every 10 days, and イニシャルクイズ every 5 weeks. Most recently, Concentration Game, 9Bubbles was updated on October 14, 2026 and イニシャルクイズ on October 12, 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.*