Rise of the Tomb Raider: 20 Year Celebration includes the critically acclaimed Rise of the Tomb Raider, nominated for over 75 “Best Of” awards, in which Lara Croft becomes more than a survivor as she embarks on her first Tomb Raiding expedition to the most treacherous and remote regions of Siberia.
Rise of the Tomb Raider: 20 Year Celebration also includes the new “Blood Ties” single player content, new Co-Op play for Endurance mode, “Ultimate Survivor” difficulty mode for the main campaign, 20 Year Celebration outfit and gun, and 5 classic Lara skins. Also includes all previously released Downloadable Content including: Baba Yaga: The Temple of the Witch, Endurance Mode, Cold Darkness Awakened, 12 outfits, 7 weapons, and 35 expedition cards. With over 50 hours of gameplay, this is the most comprehensive version of the award-winning experience.
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