# Complex Memory Trainer vs Hidden Blocks

The clearest difference is in-app purchases: Complex Memory Trainer at none against Hidden Blocks's 8. Complex Memory Trainer also leads on iOS requirement (8.1 vs 15.0). Hidden Blocks's advantage is update cadence (weekly vs every 16 months). On price, ads and device support there is nothing between them.

Both are free to download. Hidden Blocks sells 8 one-off in-app purchases. Complex Memory Trainer asks for nothing beyond the download.

Complex Memory Trainer ships an update every 16 months, Hidden Blocks weekly. The most recent releases landed on September 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Complex Memory Trainer | Hidden Blocks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 16 months | **Weekly** |
| Size | 65 MB | 86 MB |
| Requires iOS | **8.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ruslan Goncharenko](https://appshunter.io/developer/934710362) | [Logan Land](https://appshunter.io/developer/1896703411) |

## What reviewers say

### Complex Memory Trainer

[App page](https://appshunter.io/ios/app/complex-memory-trainer/id1147148504)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hidden Blocks

[App page](https://appshunter.io/ios/app/hidden-blocks-3d-block-puzzle/id6776471897)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Gems | $0.99 | one-time |
| 20 Gems | $1.99 | one-time |
| Unlimited Play · 3 Hours | $2.99 | one-time |
| 50 Gems | $4.99 | one-time |
| Unlimited Play · 24 Hours | $6.99 | one-time |
| 125 Gems | $9.99 | one-time |
| 250 Gems | $19.99 | one-time |
| 700 Gems | $49.99 | one-time |


## Frequently asked questions

### Is Complex Memory Trainer free?

Complex Memory Trainer is free to download, with no in-app purchases.

### Is Hidden Blocks free?

Hidden Blocks is free to download, with in-app purchases available.

### Do Complex Memory Trainer or Hidden Blocks have ads?

Both Complex Memory Trainer and Hidden Blocks show ads.

### Which is updated more often, Complex Memory Trainer or Hidden Blocks?

Complex Memory Trainer ships an update every 16 months, and Hidden Blocks weekly. Most recently, Complex Memory Trainer was updated on September 16, 2026 and Hidden Blocks on October 1, 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.*