iPhone Screenshots


***** Sentinel 4: Dark Star is now available! Get the series' latest epic installment here on the App Store! *****

Sentinel: Mars Defense - a premium sci-fi strategy game.

It’s war. Earth's first off-world colony is fighting for survival against a savage alien onslaught!
Mars is under siege and thousands of lives are on the line. Humanity’s only hope is you, the commander of the dropship Sentinel. Welcome to the future of Tower Defense!

Deploy sophisticated turret technology across the Martian landscapeto halt the alien advance. Protect walls and barriers that block the enemy’s path to your base. Upgrade your weaponry, or release robotic drones to repair buildings and harvest resources. Watch the battle for the planet unfold in beautifully rendered, atmospheric graphics.


- Specialised structures and units provide unique tactical gameplay.
- Use the landscape and destructible defenses to maximize the effectiveness of your weapons.
- Resource harvesting and interest system adds a new dimension of risk and reward.
- Assault mode provides hours of play; endurance mode is an endless challenge.
- Visually stunning environments, towers and enemies with fluid zooming and scrolling.
- Compete for high scores with players worldwide using GameCenter!
- Earn GameCenter achievements!
- Challenge your friends highscores directly.
- Save your progress at any time. Automatically saves during a call.


"sets a new benchmark for the rest to match"
"as unique as it is evolutionary"
"New gameplay features alone justifies adding this game to your collection"
- onemoretap.com

"Sentinel is a tower defense game that rises to the top with spectacular graphics, great sound, and intuitive controls."
"...a truly quality game."
- iPhoneAppReviews.net

"Highly addictive" "Amazing graphics" "Lots of polish"
"I spend too much time playing this game!!!"
- Appversity.com

"Excellent Graphics" "Great Sound" "New Strategy Elements"
- TouchMyApps.com

Visit www.origin8.com/sentinel for more information, screenshots, videos and our community forums.

Follow us on www.twitter.com/origin8 for updates for all our apps.

** Continue the fight with Sentinel 2: Earth Defense! **

** Dominate the universe with Space Station: Frontier! **

** Take the fight to the enemy in Sentinel 3: Homeworld! **

** Look out for Sentinel 4: Dark Star - Coming Q4 2014! **

What's New

Version 2.0.0

- OpenFeint removed and switched to Game Center due to OpenFeint shutting down servers.

- We hope you enjoy the Sentinel series as much as we enjoy making them. If you haven't already, check out Sentinel 2: Earth Defense or Sentinel 3: Homeworld and coming in 2013 - Sentinel 4: Dark Star!

Ratings and Reviews

4.4 out of 5

99 Ratings

99 Ratings

Keeping my fingers crossed


I really like this game! Please tell me it won't die with the release of IOS 11!


Casey liberatore

Please update game to fit iphone and ipod 5

Update Needed


This game is not retina graphics and not widescreen for iPhone 5.
This game is an excellent game, in dire need of an update.


Origin8 Technologies Limited
9.6 MB
Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 9+ for the following:
Infrequent/Mild Cartoon or Fantasy Violence
© Origin8 Technologies Ltd.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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