The biggest installment of the award winning Sentinel sci-fi tower defense series now on PC! Take the fight to the alien homeworld and unleash a massive arsenal of weaponry. Get up close and personal on the battlefield in your power armor to execute devastating attacks and support your defenses!

Key Features:

• An epic campaign across 20 levels.
• A powerful 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.
• NEW: Includes new content featuring new commander, enemies, campaign, weapons and more!
• Endless modes for all maps.
• NEW: Steam Achievements
• Classic mode allows you to compete for scores in a pure skill-based game mode.
• Exclusive music by Specimen A.

To activate the game, you need a Steam Account

• Login or register at the official
  Steam Website and download Steam client
• Install and start application, login with your Account name and Password
• Click the Games Menu.
• Choose Activate a Product on Steam...
• Follow the onscreen instructions to complete the process
• After the successful code verification, go to the "MY GAMES" tab and start downloading.