Think fast and hang on to your ride as you take independent control of the rider and take the ultimate test of mettle. Dual controls let you tear it up with death-defying tricks and high-flying freestyle action. Fight for traction and dig up the track to leave your mark.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.