# Know Brainer vs Penguin Rotation Puzzle

The clearest difference is ads: Know Brainer at none against Penguin Rotation Puzzle's shown. Know Brainer also leads on iOS requirement (11.0 vs 13.0). On price, update cadence, in-app purchases and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Know Brainer | Penguin Rotation Puzzle |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 92 MB | 103 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ritori](https://appshunter.io/developer/975033206) | [shuichi kimura](https://appshunter.io/developer/1679703417) |

## What reviewers say

### Know Brainer

[App page](https://appshunter.io/ios/app/know-brainer/id954165627)

Explore fascinating science facts and distinguish truth from fiction. Engage in challenges, discover surprising facts, and compete with others to become the smartest player. This addictive and free game offers a fresh perspective on the world.

**Highlights:** Mind-blowing science facts, Distinguish fact from fiction, Surprising discoveries, Challenge fellow players, Free to play, Addictive gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


### Penguin Rotation Puzzle

[App page](https://appshunter.io/ios/app/penguin-rotation-puzzle/id6760582772)

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

**In-app purchases:** none


## Frequently asked questions

### Is Know Brainer free?

Know Brainer is free to download, with no in-app purchases.

### Is Penguin Rotation Puzzle free?

Penguin Rotation Puzzle is free to download, with no in-app purchases.

### Do Know Brainer or Penguin Rotation Puzzle have ads?

Penguin Rotation Puzzle shows ads; Know Brainer does not.

### Which is updated more often, Know Brainer or Penguin Rotation Puzzle?

Know Brainer ships an update every 3 weeks, and Penguin Rotation Puzzle every 3 weeks. Most recently, Know Brainer was updated on November 6, 2026 and Penguin Rotation Puzzle on October 31, 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.*