# IMPOSSIBLE RIDDLES CHALLENGE vs Triệu Phú Tri Thức

The clearest difference is in-app purchases: IMPOSSIBLE RIDDLES CHALLENGE at none against Triệu Phú Tri Thức's 7. IMPOSSIBLE RIDDLES CHALLENGE also leads on ads (none vs shown) and iOS requirement (13.4 vs 15.6). Triệu Phú Tri Thức's advantage is update cadence (every 9 days vs monthly) and device support (4 vs 2). On price there is nothing between them.

Both are free to download. Triệu Phú Tri Thức sells 7 in-app purchases, starting at $0.99 per 7 days. IMPOSSIBLE RIDDLES CHALLENGE asks for nothing beyond the download.

IMPOSSIBLE RIDDLES CHALLENGE ships an update monthly, Triệu Phú Tri Thức every 9 days. The most recent releases landed on October 25, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | IMPOSSIBLE RIDDLES CHALLENGE | Triệu Phú Tri Thức |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 9 days** |
| Size | 88 MB | 200 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [NGUYEN DUC HIEU](https://appshunter.io/developer/762617890) | [Van Trien Nguyen](https://appshunter.io/developer/1837105460) |

## What reviewers say

### IMPOSSIBLE RIDDLES CHALLENGE

[App page](https://appshunter.io/ios/app/impossible-riddles-challenge/id6478904975)

**Features:** macOS Compatibility

**In-app purchases:** none


### Triệu Phú Tri Thức

[App page](https://appshunter.io/ios/app/trieu-phu-tri-thuc/id6751834214)

**Features:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium package weekly | $0.99 | per 7 days |
| Gói thuê bao | $0.99 | per 7 days |
| Premium subscription package | $0.99 | per month |
| Gói đăng ký hằng tháng | $1.29 | per month |
| Gói đăng ký hằng năm | $9.99 | per year |
| 50 Ruby | $0.99 | one-time |
| Premium version | $6.99 | one-time |


## Frequently asked questions

### Is IMPOSSIBLE RIDDLES CHALLENGE free?

IMPOSSIBLE RIDDLES CHALLENGE is free to download, with no in-app purchases.

### Is Triệu Phú Tri Thức free?

Triệu Phú Tri Thức is free to download, with in-app purchases available.

### Do IMPOSSIBLE RIDDLES CHALLENGE or Triệu Phú Tri Thức have ads?

Triệu Phú Tri Thức shows ads; IMPOSSIBLE RIDDLES CHALLENGE does not.

### Which is updated more often, IMPOSSIBLE RIDDLES CHALLENGE or Triệu Phú Tri Thức?

IMPOSSIBLE RIDDLES CHALLENGE ships an update monthly, and Triệu Phú Tri Thức every 9 days. Most recently, IMPOSSIBLE RIDDLES CHALLENGE was updated on October 25, 2026 and Triệu Phú Tri Thức on September 30, 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.*