一款炮塔防守 TD 游戏，界面华丽得一塌糊涂，利用一系列先进的武器，粉碎敌人的入侵，捍卫国度的安全。

完整版（解锁所有地图、关卡、武器等）解锁方法：http://bbs.51ipa.com/thread-1340-1-1.html

FEATURES
* A completely new campaign featuring 20 levels!
* A powerful new commander unit which can level up and gain new abilities as you play!
* Over 20 unlockable turrets, orbital ship weapons, automated drones and abilities at your disposal!
* Customize your weapon loadout in the Armory to match the demands of the mission!
* Stunning graphics & fx - with full high-resolution Retina Display support!
* Endless modes for all maps with online highscores.
* Classic mode allows you to compete for scores in a pure skill-based game mode.
* OpenFeint AND Game Centre supported for achievements, global scores, friends and more!
* View strategic layouts from the leaderboards - see how the best players think (OpenFeint required)
* New exclusive music by the creators of the Sentinel 2 music - Specimen A.
* Completely reworked and revamped game engine.

版本 2.0.1 中的新功能

- Fix for retina iPads, the size of the display is now back to normal.
- Wishing all our fans Happy Holidays and the very best for the New Year! Look out for Sentinel 4: Dark Star coming 2013!