The Limited Collector's Edition has a metal box cover and includes: The Ultimate DOOM Doom II: Hell on Earth Doom³ Interviews with the id crew A behind the scenes featurette Concept and production art gallery
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Convinced my mate to buy this for his xbox as I loved doom3 and couldn't believe they had ported it to the OG xbox, came in a really nice steel book case. Great port with loads of extras and splitscreen multiplayer for the original doom games.