DOOM 3 : Mars City : How do I get through the Security Checkpoint?
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DOOM 3 Hints
How do I get through the Security Checkpoint?
1 of 4: Once you find it (it's north of the large starting hangar area), do what the technician there tells you to do.
2 of 4: When he tells you to stand on one of the red floor squares, pick one and stand on it where it says "stand here."
3 of 4: Hold still there until he's done scanning you for harmful bacteria and suchlike.
4 of 4: Then you can proceed through the north door to the Departure Lounge.