Description
Take on Gotham City's most notorious criminal kingpin in the Black Mask Challenge Pack. Unlock two all-new Black Mask-themed challenge maps: Lot Full and Hidden Facility. Play as either Batman™ or Deathstroke and show Black Mask who really runs Gotham! Note: To play as Deathstroke, you must own the Deathstroke Challenge Pack.
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.
