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DOOM 3 Hints
How can I get past the security door in Entrance Checkpoint?
1 of 4: Have you approached the door?
2 of 4: When you do, a couple of imps will teleport in nearby.
3 of 4: One of them breaks the glass in the window to the left of the door.
4 of 4: Go through the window to find an unlocked door that leads to the Main Entrance Hall.
