# Space Cadet Defender HD: Invaders

> Arcade space shooter defending Earth from alien invaders with ship upgrades. (iPhone/iPad app by SixHourSoft LLC.)

- Source: https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479 (this page in markdown: same URL + `.md`)
- Developer: [SixHourSoft LLC](https://appshunter.io/developer/345114619)
- Category: Games, Entertainment, Action, Adventure
- Price: Free with in-app purchases
- Rating: 4.40/5 from 454 App Store ratings · 217 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 28 MB
- Languages: American English
- Released: 2012-06-28
- Data updated: 2026-07-05
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479/reviews.md

## What is Space Cadet Defender HD?

Defend Earth from the Alien Horde in this arcade/action space shooter.

* WHAT'S NEW:  HD graphics for retina screens, new levels, new ship upgrades.

FEATURES:
- High Definition retina graphics enhanced for the new iPad and iPhone.
- Fast paced, exciting invaders style arcade game.
- 150+ Unique levels, can you pass them all?
- Enhance your ship with powerful upgrades.
- Boss levels with powerful Alien Overlords.
- Unique powerups.
- High scores via GameCenter.
- Save and restore in-progress games.

STORY:
These are troubling times. Earth’s very existence is threatened. Alien invaders from space have been sent to destroy our planet. You have been called up to repel their attack. You must plan your battle strategy well and upgrade your fighter ship to defeat the increasingly advanced aliens. Beware, their powerful overlords are watching and will join the fight to help the alien forces destroy us. We’re counting on you. Earth is counting on you. Suit up Space Cadet!

## Key features

- HD retina graphics
- 150+ unique levels
- Ship upgrades
- Boss levels
- Unique powerups
- GameCenter high scores

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 5000 Medals | $0.99 | one-time |
| 30000 Medals | $4.99 | one-time |
| 70000 Medals | $9.99 | one-time |
| 140000 Medals | $14.99 | one-time |
| Second Invasion | $1.99 | one-time |
| Third Invasion | $1.99 | one-time |


## What do users think of Space Cadet Defender HD?

Overall sentiment: positive

**Pros**

- ⭐ Excellent game
- 🕹️ Fun and challenging gameplay
- 🕹️ Nostalgic old-school feel
- 🕹️ Addictive and engaging
- 💰 Good value for free game
- 🎨 Great graphics and visuals

**Cons**

- 💰 Difficulty requires paid upgrades to progress
- 🛠️ Controls can be sluggish or unresponsive
- 🔁 Repetitive level design
- 🔁 Lack of level variety after a certain point
- 🐛 Occasional crashes or bugs

**Commonly reported bugs**

- Crashes on certain devices
- Progression loss when resetting game
- Unresponsive controls

**Most requested features**

- More levels and content
- Level selection or reset option
- Improved controls and responsiveness
- Ability to replay completed levels

## Recent user reviews (10 of 217)

All indexed reviews: https://appshunter.io/ios/app/space-cadet-defender-hd-invaders/id513176479/reviews.md

### 5/5 — Fun game

*2026-03-15, version 1.8*

Challenging and fun

### 5/5 — Fantastic free game

*2026-03-10, version 1.8*

Would recommend highly if you think your good enough 😁

### 5/5 — Still amazing

*2024-04-04, version 1.8*

Used to play a decade ago opinion hasnt changed

### 5/5 — It is best

*2023-03-25, version 1.8*

This game is so fun!
So 5 ⭐️

### 4/5 — Good game

*2022-11-17, version 1.8*

This game is good and has the right amount of difficulty but you have to pay for extra levels after you beat it luckily they aren’t too expensive though

### 1/5 — needs update

*2022-10-03, version 1.8*

need ability to move ship with 1 finger instead of lame arrow controller !

### 4/5 — A bit hard but good

*2022-09-20, version 1.8*

I never stopped die

### 4/5 — Could you make It touch screen?

*2022-07-23, version 1.8*

Was a bit annoying how you use buttons. Buttocks

### 5/5 — Old school

*2022-04-01, version 1.8*

Love this game. Controls are easy and the game does not seem to be glitchy. I think this game was put together and reminds you of the old school space games

### 5/5 — CK/Avenger

*2021-10-10, version 1.8*

Love this game only a beginner but, I’m learning

## Frequently asked questions about Space Cadet Defender HD

### What is Space Cadet Defender HD?

Space Cadet Defender HD is an arcade-style action game where you defend Earth from an alien invasion. It features fast-paced gameplay, over 150 levels, and the ability to upgrade your ship.

### What are the key features of this game?

Key features include high-definition retina graphics, over 150 unique levels, ship upgrades, challenging boss levels with alien overlords, unique powerups, GameCenter integration for high scores, and the ability to save and restore game progress.

### Is Space Cadet Defender HD free to play?

The game is free to download and play, but it does offer in-app purchases. These purchases can be used to enhance your gameplay experience, such as acquiring ship upgrades or powerups.

### What devices is Space Cadet Defender HD compatible with?

The game features HD graphics enhanced for retina screens, specifically mentioning compatibility with the new iPad and iPhone. It is designed for iOS devices.

### What is the main objective of the game?

The main objective is to defend Earth from an alien horde. Players must strategically plan their battles, upgrade their fighter ship, and defeat increasingly advanced aliens and their powerful overlords to save the planet.

## Version history (last 5 releases)

### 1.8 — 2017-03-31

This app has been updated by Apple to display the Apple Watch app icon.

- New level pack with 50 additional levels.
- New enemies and new challenges.
- New special weapon, the Mega Laser!

*Yes, we know it's been way to long, thanks to all our fans for their patience :).

### 1.7 — 2016-11-05

- Adding support for iOS 10 and for 64bit.
- Fixed a bug in the sound system.
- Various other minor bug fixes.

### 1.6 — 2014-01-09

- Added link to the new release of Space Cadet Defender: Recon.
- Added particle effects for explosions, exhaust, engines.
- Fixed some collision bugs.
- Updated for iOS7.

### 1.5 — 2013-01-24

- iPhone 5 ready!
- Fixed issue on wave 99 where sometimes screen was going black.
- Fixed multiple minor wave issues.

### 1.4 — 2012-10-16

- iPhone 5 ready! 
- iOS 6 support.
- Bug Fix: Fixed startup crash caused by GameCenter changes in iOS6.

## Apps similar to Space Cadet Defender HD

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Galaxy Invaders - Space Attack](https://appshunter.io/ios/app/galaxy-invaders-space-attack/id6443981789) | 4.2 (55) | Free | Games |
| [Space Shooter Alien Galaxy War](https://appshunter.io/ios/app/space-shooter-alien-galaxy-war/id6502821321) | 5.0 (2) | Free | Games |
| [Galaxy Legend](https://appshunter.io/ios/app/galaxy-legend/id599877646) | 4.1 (325) | Free | Games |
| [Galaxy Pirates - space attack](https://appshunter.io/ios/app/galaxy-pirates-space-attack/id6475720088) | 5.0 (1) | Free | Games |
| [Galaxy Jet Fighter](https://appshunter.io/ios/app/galaxy-jet-fighter/id1048161382) | 5.0 (2) | Free | Games |
| [Galaxy Shooting-Alien Shooter](https://appshunter.io/ios/app/galaxy-shooting-alien-shooter/id1573853793) | 5.0 (3) | Free | Games |

## More apps by SixHourSoft LLC

- [Space Cadet Defender](https://appshunter.io/ios/app/space-cadet-defender/id345114616)
- [Space Cadet Defender: Recon Invaders](https://appshunter.io/ios/app/space-cadet-defender-recon-invaders/id712286226)

All apps by SixHourSoft LLC: https://appshunter.io/developer/345114619

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-05.*