# Viper maze vs Loop 16 Puzzle

The clearest difference is price: Loop 16 Puzzle at Free against Viper maze's $1.99. Loop 16 Puzzle also leads on in-app purchases (none vs 1) and update cadence (every 10 days vs every 3 months). Viper maze's advantage is iOS requirement (13.0 vs 26.0). On ads and device support there is nothing between them.

Loop 16 Puzzle is free to download; Viper maze costs $1.99 up front. Viper maze sells 1 one-off in-app purchase. Loop 16 Puzzle asks for nothing beyond the download.

Viper maze ships an update every 3 months, Loop 16 Puzzle every 10 days. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Viper maze | Loop 16 Puzzle |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Size | 6 MB | 1 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Martin Gruner](https://appshunter.io/developer/1824447154) | [Kiyoshi Izumi](https://appshunter.io/developer/1807085294) |

## What reviewers say

### Viper maze

[App page](https://appshunter.io/ios/app/viper-maze/id6748138935)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full game | $3.99 | one-time |


### Loop 16 Puzzle

[App page](https://appshunter.io/ios/app/loop-16-puzzle/id6759582501)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Viper maze free?

Viper maze costs $1.99, and also offers in-app purchases.

### Is Loop 16 Puzzle free?

Loop 16 Puzzle is free to download, with no in-app purchases.

### Do Viper maze or Loop 16 Puzzle have ads?

Neither Viper maze nor Loop 16 Puzzle shows ads.

### Which is updated more often, Viper maze or Loop 16 Puzzle?

Viper maze ships an update every 3 months, and Loop 16 Puzzle every 10 days. Most recently, Viper maze was updated on September 10, 2026 and Loop 16 Puzzle on September 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*