# Mahjong Stack Quest vs ScrewNut Lab

The clearest difference is review sentiment: ScrewNut Lab at 100% against Mahjong Stack Quest's 0%. ScrewNut Lab also leads on rating (5.0 vs 2.4). On price, ratings volume, update cadence and ads there is nothing between them.

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

ScrewNut Lab holds the better App Store score, 5.0 against 2.4. Both are backed by a comparable volume of ratings — 5 and 4 respectively. Written reviews point the same way: 0% of Mahjong Stack Quest's written reviews are positive against 100% of ScrewNut Lab's.

Mahjong Stack Quest ships an update fortnightly, ScrewNut Lab every 2 weeks. Both last shipped on October 8, 2026.

## The numbers

| Metric | Mahjong Stack Quest | ScrewNut Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (5 ratings)](https://appshunter.io/ios/app/mahjong-stack-quest/id6798761763/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/screwnut-lab/id6799378076/reviews)** |
| Number of ratings | **5** | 4 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Ad-supported | Ad-supported |
| Size | 369 MB | 384 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [洁 周](https://appshunter.io/developer/1871627320) | [佩龙 孟](https://appshunter.io/developer/6797281125) |

## What reviewers say

### Mahjong Stack Quest

[App page](https://appshunter.io/ios/app/mahjong-stack-quest/id6798761763)

A fast-paced mahjong puzzle game where players must quickly identify and replace incorrect tiles drifting down the screen. Aim and fire replacements to complete mahjong hands before time runs out.

**Highlights:** Fast-paced mahjong gameplay, Classic hand recognition, Precise aiming action, Tile replacement mechanic, Multiple difficulty levels (Easy, Hard, Devil), Time-based challenges

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

**In-app purchases:** none


### ScrewNut Lab

[App page](https://appshunter.io/ios/app/screwnut-lab/id6799378076)

Engage in a physics-based puzzle game where you assemble mechanical components. Manipulate nuts, bolts, and tools, observing their interactions with friction, vibration, and heat to solve experiments. Focus on visual and tactile feedback to understand complex mechanical systems.

**Highlights:** Mechanical assembly puzzles, Realistic physics simulation, Friction, vibration, and heat mechanics, Visual and tactile feedback, Interactive rigs for experimentation, System-based problem solving

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

**In-app purchases:** none


## Frequently asked questions

### Is Mahjong Stack Quest free?

Mahjong Stack Quest is free to download, with no in-app purchases.

### Is ScrewNut Lab free?

ScrewNut Lab is free to download, with no in-app purchases.

### Which has better reviews, Mahjong Stack Quest or ScrewNut Lab?

ScrewNut Lab is rated higher. Mahjong Stack Quest averages 2.4 out of 5 from 5 ratings, while ScrewNut Lab averages 5.0 from 4 ratings.

### Do Mahjong Stack Quest or ScrewNut Lab have ads?

Both Mahjong Stack Quest and ScrewNut Lab show ads.

### Which is updated more often, Mahjong Stack Quest or ScrewNut Lab?

Mahjong Stack Quest ships an update fortnightly, and ScrewNut Lab every 2 weeks. Most recently, Mahjong Stack Quest was updated on October 8, 2026 and ScrewNut Lab on October 8, 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.*