The world is in great danger, threatened by two dimensional rulers, Nightmare and Dormammu, and their foul ally Baron Mordo, who team up to capture our world. Only you can help the Sorcerer Supreme stop the invasion and defeat them once and for all!

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 "LIBRARY" tab and start downloading.