Call of Duty: Black Ops III Zombies Chronicles Edition includes the full base game and the Zombies Chronicles content expansion. Call of Duty: Black Ops III combines three unique game modes: Campaign, Multiplayer, and Zombies, providing fans with the deepest and most ambitious Call of Duty ever. The Zombies Chronicles content expansion also contains 8 remastered classic Zombies maps from Call of Duty®: World at War, Call of Duty®: Black Ops and Call of Duty®: Black Ops II. Complete maps from the original saga in fully remastered HD playable in Call of Duty®: Black Ops III.

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.