Batman: Arkham Origins features an expanded Gotham City and introduces an original prequel storyline occurring several years before the events of Batman: Arkham Asylum and Batman: Arkham City. Taking place before the rise of Gotham City's most dangerous villains and assassins, the game showcases a young, raw, unrefined Batman as he faces a defining moment in his early career as a crime fighter that sets his path to becoming the Dark Knight. As the story unfolds, witness identities being formed and key relationships being forged.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.