In this Insanely Twisted, 2-D action-adventure game, explore unique environments and battle bizarre creatures as you make your way toward the center of the mysterious Shadow Planet! Solve complex puzzles and upgrade your ship with alien technology as you fight to save your home world.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.