Doom 3/Mars City (Prologue)
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< Doom 3
Mars City is your starting location. When you land, you are directed to meet Sargent Kelly to obtain your initial instructions to head to Mars City Underground.
Follow the signs to Marine Command. However, you are free to take a look at public terminals and other visible areas to get a feel of the city in question, as you will need to return to this area later on.
[edit] Minigame
In the break room, there is the Super Turbo Turkey Puncher 3 minigame. Use 
to play the game; you score 10 points on each hit, or 25 if it is part of a combo chain. Killing a turkey is 100 points, or 250 if it is in a combo attack.
