# 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ vs Math Duel

The clearest difference is in-app purchases: 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ at none against Math Duel's 6. 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ also leads on update cadence (every 10 days vs every 4 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Math Duel sells 6 one-off in-app purchases. 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ asks for nothing beyond the download.

大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ ships an update every 10 days, Math Duel every 4 weeks. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ | Math Duel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/2iq/id1115273015/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 41.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 10 days** | Every 4 weeks |
| Monetization | Ad-supported | — |
| Size | 12 MB | 52 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ikue Konno](https://appshunter.io/developer/971968281) | [HAO CHANG KUO](https://appshunter.io/developer/1735524069) |

## What reviewers say

### 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~

[App page](https://appshunter.io/ios/app/2iq/id1115273015)

A brain training app designed for adults to sharpen their minds with a variety of riddles. It offers 100 questions ranging from easy to challenging, perfect for passing the time and stimulating your intellect.

**Highlights:** Brain training for adults, 100 riddle questions, Varied difficulty levels, IQ and cipher quizzes, Time-killing entertainment

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

**In-app purchases:** none


### Math Duel

[App page](https://appshunter.io/ios/app/math-duel-mental-math-battle/id6770234325)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Energy Potion Pack | $0.99 | one-time |
| Basic Tool Pack | $0.99 | one-time |
| Advanced Pass Upgrade | $0.99 | one-time |
| Starter Pack | $1.99 | one-time |
| Standard Pass | $2.99 | one-time |
| Advanced Pass | $3.99 | one-time |


## Frequently asked questions

### Is 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ free?

大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ is free to download, with no in-app purchases.

### Is Math Duel free?

Math Duel is free to download, with in-app purchases available.

### Do 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ or Math Duel have ads?

Both 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ and Math Duel show ads.

### Which is updated more often, 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ or Math Duel?

大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ ships an update every 10 days, and Math Duel every 4 weeks. Most recently, 大人のなぞなぞ 2~暇つぶし脳トレIQアプリ~ was updated on October 29, 2026 and Math Duel on October 24, 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.*