An ally turned enemy, Singleton’s journey remains a mystery to his former companions. This 3 mission, Grey Goo mini-campaign follows the events of Singleton immediately following the explosion at the Terminal, and reveals the true motivations behind the overwhelming Goo force.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam