Quake II/Launch Command

Level objective
The objective for this level is to shut off the coolant to the CPU core.

Strategy
(Expand this section)

Shutting off the Coolant
When you operate the wheel valve, you will get the message "1 more to go...". Jump onto the roof of the entrance to the room, duck under the pipe and jump up to the wheel valve on the other side. Or, just drop down and use the other elevator. Turn the second valve to get the message "Sequence completed!" and, after quite a long pause, the message "Core CPU is no longer functional" and finally "Access now possible to launch system". You can now open the fourth door off the circular passage.

The Blackhole Generator Computers
So, leave this room by the way you came in and shoot down the Technician waiting outside. Go 180 degrees around the central column and through the door under the "LAUNCH SYSTEMS" sign, which now stands open. The passage takes you to the left, where you will meet a Gunner, and then to the right and to a door. Open the door and deal with the four Guards inside. You will get the message "destroy the computers". The computers are on the walls to the left and right. First, take a look through the bars at the far end of the room where you can see what we assume is the black hole generator merrily spinning away. OK, now shoot the computers (see Secrets, below, at this point). Take another look through the bars and ... it's gone! Your field computer, which previously showed "Destroy the blackhole generator", now shows "Primary unit objectives complete" and "Launch systems destroyed. Force field disabled.  Proceed to exit".

Secrets
This level has two (2) secrets:
 * 1) At the very beginning of the level, get up onto the large platform under the nested, spinning rings of the black hole generator.  You'll need to do this with a rocket jump (or grenade jump, if you prefer).  To minimize the damage you take, stand with your back right up against the platform and point the Rocket Launcher straight down at your feet.  Jump, and at the highest point of your jump shoot the rocket and hit and hold the move backwards key.  If you start with good health and armor, you will lose maybe 8 points of health and 34 points of armor.  Sometimes, but not all the time, you get a message congratulating you on your rocket jump.  Go over to the back of the platform, slightly to the right of the tower back there.  You will find Health, a BFG10K and assorted ammunition.  There is a ladder to get back up onto the platform after you have collected them.
 * 2) At the very end of the level, just as you enter the exit corridor that was blocked by a force field until you messed up the computers, notice the cracked pane of glass on the left.  Shoot it, go through and dive to the bottom of the pool to collect some ammunition.  You will get the message "You have found a secret area!".