The fun of LEGO, the drama of Batman and the uniqueness of the combination makes for a comical and exciting adventure in LEGO Batman: The Videogame. Play as Batman and his sidekick Robin as you build, drive, swing and fight your way through Gotham City capturing escaped villains including The Joker, Penguin, Scarecrow and more. Then, jump into the story from the other side and play as Batman's foes! Enjoy the power you wield and battle Batman while spreading chaos throughout the city. There is no rest for the good (or evil!).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.