# The Lock vs Underdark

The clearest difference is in-app purchases: The Lock at none against Underdark's 10. The Lock also leads on ads (none vs shown) and review sentiment (100% vs 72%). Underdark's advantage is ratings volume (4.1K vs 6). On price, update cadence and device support there is nothing between them.

Both are free to download. Underdark sells 10 one-off in-app purchases. The Lock asks for nothing beyond the download.

The Lock holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Underdark has 4.1K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 100% of The Lock's written reviews are positive against 72% of Underdark's.

The Lock ships an update every 2 days, Underdark every 4 days. The most recent releases landed on November 4, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | The Lock | Underdark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/the-lock-game/id6471700369/reviews)** | [4.8 (4.1K ratings)](https://appshunter.io/ios/app/underdarkdefense/id6482025287/reviews) |
| Number of ratings | 6 | **4.1K** |
| Positive reviews | **100.0% of reviews** | 72.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 21 MB | 521 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jonathan Taveras](https://appshunter.io/developer/1270478820) | [SeungHo Chung](https://appshunter.io/developer/1626940418) |

## What reviewers say

### The Lock

[App page](https://appshunter.io/ios/app/the-lock-game/id6471700369)

A unique puzzle game where players guess numbers using a spinner. It offers immersive haptic feedback and engaging visuals to guide players. Unlock and collect various themes as you progress through the challenges.

**Highlights:** Number guessing gameplay, Spinner mechanic, Haptic feedback, Visual hints, Collectible themes

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

**In-app purchases:** none


### Underdark

[App page](https://appshunter.io/ios/app/underdarkdefense/id6482025287)

Defend the Eternal Flame from relentless dark forces in this tactical tower defense game. Strategically place towers, choose powerful buffs, and level up unique heroes to create an impenetrable defense. Enjoy one-handed gameplay for fun anytime, anywhere.

**Highlights:** Defend the Eternal Flame, One-handed gameplay, Customize defense strategy, Level up heroes, Unique hero abilities, Strategic tower placement

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| daily_package_01 | $0.99 | one-time |
| blade_pakcage | $2.99 | one-time |
| daily_package_02 | $2.99 | one-time |
| exp_2x | $3.49 | one-time |
| Event Package 2 | $3.99 | one-time |
| add_speed | $7.49 | one-time |
| season_superpass_1 | $7.99 | one-time |
| pack_remove_ads | $7.99 | one-time |
| pack_remove_ads2 | $10.99 | one-time |
| season_hyperpass_1 | $18.99 | one-time |

**What reviewers like**

- 🚀 Addictive gameplay
- 👍 Generous with rewards
- 🚀 Smooth performance
- 👍 No forced ads
- 👍 Unique tower defense mechanics

**What reviewers complain about**

- 🐛 Multiplayer issues
- 🔋 Battery drain
- 🔒 Paywall for progression
- 🔒 Excessive microtransactions
- 🔒 Confusing UI with too many menus

**Reported bugs**

- Goblin tower factory causing game slowdown
- Consecutive login rewards reset after updates
- Invisible towers in multiplayer

**Requested features**

- Ability to rotate towers
- Move towers after placement
- More enemy variety and animations
- Improved co-op mode
- Simplified progression system


## Frequently asked questions

### Is The Lock free?

The Lock is free to download, with no in-app purchases.

### Is Underdark free?

Underdark is free to download, with in-app purchases available.

### Which has better reviews, The Lock or Underdark?

The Lock is rated higher. The Lock averages 5.0 out of 5 from 6 ratings, while Underdark averages 4.8 from 4.1K ratings.

### Do The Lock or Underdark have ads?

Underdark shows ads; The Lock does not.

### Which is updated more often, The Lock or Underdark?

The Lock ships an update every 2 days, and Underdark every 4 days. Most recently, The Lock was updated on November 4, 2026 and Underdark on November 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.*