The complete megahit game that set the world afire. Plus All-New Episode IV: Thy Flesh Consumed. The demons came and the marines died. Except one. You are the last defense against these hell-spawned hordes. Prepare for the most intense mutant-laden, blood-splattered action ever! The texture-mapped virtual world is so real, you don’t just play DOOM – you live it. The Ultimate DOOM takes you beyond anything you’ve ever experienced. First, you get all three original episodes – that’s 27 levels of awesome, explosive excitement. Then it really blows you away with an all-new episode: Thy Flesh Consumed. Now you’re dead meat. Just when you think you’re getting pretty good at DOOM, you get hit with Perfect Hatred, Sever the Wicked and seven other expert levels never seen before! They’re so incredibly tough, the first 27 levels will seem like a walk in the park!

— Activation Details —

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.