Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace in this Tower Defense Shooter from Tim Schafer's Double Fine Productions. Use a combination of mobile firepower and stationary defenses to turn the tide of war in our favor. Customize your trench with thousands of possible loadouts. March side-by-side with allies from around the world as you fight your way through Europe, Africa, and the Pacific.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.