The galaxy's finest tower defense series returns with an epic new installment

Sentinel's award-winning strategy gameplay expands explosively as the interstellar war moves to a mysterious alien world. Deploy devastating new towers and technology against an enemy that's smarter and more deadly than ever before. Battle across vast landscapes and earn a wealth of upgrades as you explore the mystery of the Dark Star.


• A huge campaign across 26 unique maps, each also playable in Endless mode.

• A second campaign introducing more weaponry and exploring a different part of the Dark Star.

• Defend massive, multi-screen landscapes and marathon paths.


• A bestiary full of new and returning enemies. Their special abilities and varied behaviour will keep even veteran players on their toes.

• The aliens fight back with the ability to damage, disable and destroy towers. How will you choose to counter them?


• Pick your loadout from an extensive assortment of weaponry. Unlock Uber Towers that pack power to match their size.

• Deploy your own units onto the path to hinder attackers.

• Call in support from the skies with the Sentinel's trademark ship weapons.

• Unleash drones, nukes and more from your new improved Stronghold.

• Control Commander heroes to back up your defenses. Earn experience and level up to gain powerful new abilities.


• Real-time dynamic lighting and shader effects bring atmosphere to the alien landscape for the best Sentinel experience yet.**

• iCloud enabled for game saving across devices.

• GameCenter for leaderboards and achievements.


• Spend your earnings on a massive selection of persistent upgrades to support your play style and complement your tactics.

• Upload your score to the Global Nexus and contribute to the worldwide cooperative push for rewards.

Follow us @origin8 on Twitter, Facebook

** Recommended for: iPad2+, iPhone4S+ and iPod Touch 5thGen+.
** The game will work on iPhone3GS, iPad1 and iPod Touch 4thGen but without these effects.

What’s New

Version 2.2.2

This app has been updated by Apple to use the latest Apple signing certificate.

- iOS9 compatibility
- Balance tweaks and bug fixes

Ratings and Reviews

4.1 out of 5
82 Ratings

82 Ratings

BayesianInitiate ,

Great game except still crashes on mothership.

Great game. It crashes 100% of the time on the last level when the mothership is onscreen. Very frustrating to not be able to finish. On 64GB iPhone XS.

Lqudsmoke ,

Better than before

Sentinel 3 homeworld was probably my favorite tower defense ever. And I really was skeptical after reading other reviews before I downloaded sentinel 4. Now after playing through all difficulties including psycho I am definitely a huge fan. They outdid themselves this time. I thought the enemy being able to damage your towers would take the fun out of it. However it made it a wonderful challenge and they balanced the game with auto repair and the drones repair relatively quickly. Also the larger size of the super towers was disappointing but it you plan carefully you can beat any difficulty. You don't even need to spend money on star fragments. Also I got the juggernaut after I beat the game and he is a wonderful commander addition. The price is very reasonable. Support the game! It's only $0.99 don't be cheap. They don't have obnoxious adds and it's a great game.

Anthonnio Muniz ,

The Previous 3.....

I never played this game yet but I still have it on my iPhone. All that’s left is for Origin8 to update the previous 3 to be compatible with the iPhone 6 & beyond. I just love playing these games, they’re my personal favorites. What I miss about the 2nd Sentinel game is its music. Other than that, I ❤️ the entire series.

Comment Update on June 25th 2020:
I still consider on them bringing back the first three installments in order to complete the series & all of us as fans of this series can enjoy playing all of them on our iPhones or iPads. I really love these games but what upsets me is that they only have the fourth installment available......😒😒😒😒😒

App Privacy

The developer, Origin8, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

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

More By This Developer

You May Also Like