# Codename Erizo vs Optical Illusions

The clearest difference is review sentiment: Codename Erizo at 100% against Optical Illusions's 0%. Codename Erizo also leads on ads (none vs shown) and update cadence (every 4 days vs every 19 months). Optical Illusions's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Codename Erizo ships an update every 4 days, Optical Illusions every 19 months. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Codename Erizo | Optical Illusions |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/codename-erizo-invasion/id1437059945/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 19 months |
| Monetization | **Free** | Ad-supported |
| Size | 22 MB | 149 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [yurai.cl](https://appshunter.io/developer/406314707) | [Rocketship Studios LLP](https://appshunter.io/developer/1456752660) |

## What reviewers say

### Codename Erizo

[App page](https://appshunter.io/ios/app/codename-erizo-invasion/id1437059945)

Guide hedgehogs back to their spaceship after an alien abduction. Push them into the ship to complete your rescue mission. Are you up for the challenge?

**Highlights:** Hedgehog rescue gameplay, Push mechanics, Alien spaceship objective, Challenging missions

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

**In-app purchases:** none


### Optical Illusions

[App page](https://appshunter.io/ios/app/optical-illusionsbrain-teaser/id1555733337)

Engage with a collection of mind-bending visual puzzles designed to challenge your perception and cognitive skills. Explore numerous optical illusions that will test your brain power and visual acuity in a fun and engaging way.

**Highlights:** Hundreds of optical illusion challenges, Spot trick questions and hidden traps, Minimal design for illusion clarity, Time-limited challenges, Suitable for all ages, IQ training and mind games

**In-app purchases:** none


## Frequently asked questions

### Is Codename Erizo free?

Codename Erizo is free to download, with no in-app purchases.

### Is Optical Illusions free?

Optical Illusions is free to download, with no in-app purchases.

### Do Codename Erizo or Optical Illusions have ads?

Optical Illusions shows ads; Codename Erizo does not.

### Which is updated more often, Codename Erizo or Optical Illusions?

Codename Erizo ships an update every 4 days, and Optical Illusions every 19 months. Most recently, Codename Erizo was updated on October 10, 2026 and Optical Illusions on October 13, 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.*