The Earth Defense Force has been defeated, and after centuries of oppression, Mars is finally free. For a time, there was peace. Yet from the forgotten ashes rose Adam Hale, scarred from years of struggle, seeking ultimate revenge against the Red Faction. His target, the one thing that keeps the surface of Mars habitable for thousands of colonists, is the Terraformer. Relive the battle for the Terraformer through four incredible new missions featuring aerial flyers, orbital strikes, and the Red Faction armored surface tank. Unlock two destructive new weapons, the Sharpshooter Gun and Shard Cannon, while earning ten new achievements in this thrilling new mission pack for Red Faction: Armageddon!Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.