# Concentration Sushi vs せかいちずパズル

The clearest difference is in-app purchases: せかいちずパズル at none against Concentration Sushi's 2. せかいちずパズル also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). Concentration Sushi's advantage is iOS requirement (12.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Concentration Sushi sells 2 one-off in-app purchases. せかいちずパズル asks for nothing beyond the download.

Concentration Sushi ships an update every 3 months, せかいちずパズル every 2 weeks. The most recent releases landed on August 12, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Concentration Sushi | せかいちずパズル |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/concentration-sushi/id458072561/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 95.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 132 MB | 2 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qualia Systems Inc.](https://appshunter.io/developer/388873648) | [Naoki Chiba](https://appshunter.io/developer/1895372512) |

## What reviewers say

### Concentration Sushi

[App page](https://appshunter.io/ios/app/concentration-sushi/id458072561)

Enhance your focus with this memory-based game. Test your recall by matching sushi cards with varying storage times across multiple difficulty levels. Compete with friends via Game Center.

**Highlights:** Memory card matching, Multiple game modes, Adjustable card storage times, Game Center integration, Infinite mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| V.S.Mode | $0.99 | one-time |
| No Ads | $3.99 | one-time |


### せかいちずパズル

[App page](https://appshunter.io/ios/app/id6790808380)

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

**In-app purchases:** none


## Frequently asked questions

### Is Concentration Sushi free?

Concentration Sushi is free to download, with in-app purchases available.

### Is せかいちずパズル free?

せかいちずパズル is free to download, with no in-app purchases.

### Do Concentration Sushi or せかいちずパズル have ads?

Concentration Sushi shows ads; せかいちずパズル does not.

### Which is updated more often, Concentration Sushi or せかいちずパズル?

Concentration Sushi ships an update every 3 months, and せかいちずパズル every 2 weeks. Most recently, Concentration Sushi was updated on August 12, 2026 and せかいちずパズル on September 16, 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.*