File:Quake II Security Complex Red Key.png

From Quake II, PC version, the objective of your first visit to the Security Complex is to obtain the Red Key. As you can see, it is guarded by a Gladiator. You can fight him man-to-man or, if you can find a Grenade Launcher, you can kill him from the safety of the pyramid courtyard, to the left of and below this picture.