Limbo is a black and white puzzle-platforming adventure. Play the role of a young boy traveling through an eerie and treacherous world in an attempt to discover the fate of his sister. Limbo's design is an example of gaming as an art form. Short and sweet, doesn't overstay its welcome. Puzzles are challenging and fun, not illogical and frustrating.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.