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Compare game prices. Buy Super Mario Galaxy PC in retail box or cd key. Activate Super Mario Galaxy on official platforms such as Steam. Super Mario Galaxy cheapest price.
Super Mario Galaxy
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Use your CD key on Steam to download your game.
Super Mario Galaxy
For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your game code. Thus, the game will be activated and automatically added to your account library.