HOARD: Dynamite Roll! DLC pack is full of new and exciting content that any self-respecting dragon should own! Hours of new treasure-hoarding joy are included: 9 new maps, including more co-op maps: Team up to break through the arcane defenses of Artillery and keep enemies at bay in Rampart!
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