# Concentration Game - Solo — Brain training playing cards

> Single-player card game matching numbered pairs with increasing difficulty. (iPhone/iPad app by Hirokazu Uno.)

- Source: https://appshunter.io/ios/app/concentration-game-solo/id1616382609 (this page in markdown: same URL + `.md`)
- Developer: [Hirokazu Uno](https://appshunter.io/developer/1570016990)
- Category: Games, Casual, Card
- Price: Free
- Rating: 4.60/5 from 14 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 103 MB
- Languages: American English, Japanese
- Released: 2022-03-29
- Data updated: 2026-08-24
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/concentration-game-solo/id1616382609/reviews.md

## What is Concentration Game?

It is a classic card game.
For one person.
Match pairs of the same numbers.
The time limit decreases as the level goes up.
You can obtain and collect images by clearing levels.

## Key features

- Single-player card game
- Match numbered pairs
- Time limit decreases with level
- Brain training
- Classic card game mechanics

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/concentration-game-solo/id1616382609/reviews.md

### 4/5 — レビュー

*2024-08-11*

操作もしやすくカードも覚えやすい

## Frequently asked questions about Concentration Game

### What is Nervous Weakness - Solo?

Nervous Weakness - Solo is a single-player card game designed for brain training. It involves matching pairs of cards with the same numbers, with the time limit becoming more challenging as you progress through levels.

### How does the difficulty increase in Nervous Weakness - Solo?

The difficulty in Nervous Weakness - Solo increases as the time limit decreases with each advancing level. This requires players to think and react faster to successfully match pairs.

### Can I play Nervous Weakness - Solo offline?

The provided information does not specify offline play capabilities for Nervous Weakness - Solo. However, as a single-player card game, it is likely playable without an internet connection.

### What devices is Nervous Weakness - Solo available on?

Nervous Weakness - Solo is available on iPhone, iPad, and iPod devices, indicated by its supported devices list.

### What is the age rating for Nervous Weakness - Solo?

Nervous Weakness - Solo has an age rating of 4+, making it suitable for young children and up.

### How often is Nervous Weakness - Solo updated?

Nervous Weakness - Solo was last updated on May 26, 2025, indicating recent development and potential for ongoing improvements.

### Does Nervous Weakness - Solo have ads?

Yes, Nervous Weakness - Solo contains advertisements. This is indicated by the 'hasAds' flag being true in the application data.

### What is the user rating for Nervous Weakness - Solo?

Nervous Weakness - Solo has an excellent user rating of 4.9 stars, based on 12 ratings, suggesting high user satisfaction.

## Version history (last 5 releases)

### 2.2 — 2026-08-06

Minor corrections and adjustments.

### 2.0 — 2026-08-05

UI update. Added image collection function.

### 1.9 — 2025-05-26

Minor corrections and adjustments.

### 1.8 — 2024-12-31

Minor corrections and adjustments.

### 1.7 — 2024-11-03

Minor corrections and adjustments.

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## More apps by Hirokazu Uno

- [Reverse Stone - Classic game](https://appshunter.io/ios/app/reverse-stone-classic-game/id1570016988)
- [1 Minute Mental Arithmetic](https://appshunter.io/ios/app/1-minute-mental-arithmetic/id1573246963)
- [Zombie Attack-save the village](https://appshunter.io/ios/app/zombie-attack-save-the-village/id1578099734)
- [Get My IDFA](https://appshunter.io/ios/app/get-my-idfa/id1580368827)
- [Brain Room - Block Push Puzzle](https://appshunter.io/ios/app/brain-room-block-push-puzzle/id1588265988)
- [Ball Sort Puzzle - Infinity](https://appshunter.io/ios/app/ball-sort-puzzle-infinity/id1602521330)

All apps by Hirokazu Uno: https://appshunter.io/developer/1570016990

## Related topics

[concentration play](https://appshunter.io/ios/topics/concentration-play) · [concentration games card](https://appshunter.io/ios/topics/concentration-games-card)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*