Doom 3 Xbox Secrets

Hidden movie

Once you kill the first scientist who gets turned into a zombie, look at the main control panel. One of the screens right near you should be blinking red. Click on it to watch a little movie.

Machine Gun in Underground passage.

After you get you shotgun and reach the security area, go in side and unlock the door. After the door is unlocked, on the same screen, look at the botom of the screen and click on one of the 2 choices. One should bring up the lockers, showing one is locked and the other open. Click on the one that says locked. Now head out into the elavator room and kill the imp that jumps down. Look at the lockers now, the other one is now open, allowing you to have the machine gun and more shotgun ammo. (Note: After you grab all the goodies in the locker, an imp will come out of the door you just came out of to get the goodies.)

Two exclusive levels for xbox doom3 and Doom3 ROE

Doom3 Collector's edition and Doom3 Resurraction of Evil for xbox both have Ultimate doom and Doom2 included with it.

There are two exclusive levels created just for these 2 games..

Ultimate doom secret level - Sewers Episode 1 mission 10
This level can be accessed by going through the first episode Knee deep in the dead in the very first level.. The exit is located in the outside area with the blue armor and go against the wall using the action button and you shall exit the level into the new level..

Doom 2 New Secret Level - Betray level 33

To access this secret level, play level 2 entryway, go to the area where you find the red key card, when you get it, a room with sargents and imps will open, go kill them all and go into that little room with the imps which is on the right side, push the action while you walk around agains the wall and you shall exit the level.