Looterkings is a procedural dungeon-crawler you can play online in coop-mode with up to 3 of your friends. Loot as much as you can on your way up from the dark caves beneath earth to the surface, gear up and reach your ultimate goal ravaging the hallowed halls of the Elven Queen, eventually.
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