The Ultimate Edition includes: base game Deluxe Edition Upgrade Season Pass Call to Arms offers an innovative new look into modern era combat. Initially offering two playable factions with realistically modeled vehicles and heavy weaponry, as well as dozens of firearms and customizations. Command your troops to victory or fight by yourself in the 3rd person action mode. The base game offers two factions: the United States Army and the Global Revolutionary Movement. Fight in rural areas, factories, railway stations or in towns and use the environment to your advantage. Cover is everywhere, and almost everything can be destroyed. An unseen amount of challenges are awaiting you in exciting online combat supported by Steamworks! The game allows you to command your units in the classic real-time strategy mode or to fight directly by taking control over an individual vehicle in the 3rd person action mode.

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.