Quake II/Research Lab

Level objective
The objective for this level is to locate the repair facility, steal the Commander's head, then retrace your steps and return to the Outer Hangar.

Strategy
Other than always being on the lookout for strogg with a suitable weapon in hand, there is no particular strategy needed to get through this level. The path that you need to take is clear. If you find your way blocked, then you have missed something that you need to do, such as deploy a walkway or shut off a force field.

Secrets
This level has one (1) secret, plus a bonus: A.H.D.S.S.I.B.H. bjjc
 * Adjacent the upper end of the transparent Maintenance Bridge there's a cracked bar over a holding cell. Hit it with the Blaster until the bars shatter and jump up into the cell to get a Quad Damage and Slugs from the compartment that has been opened at the back.
 * Bonus — Once you've acquired the Commander's head, just before you leave the Research Lab, note the holding cell window to the right that is now broken open.  Jump into the holding cell and follow the low passageway to the end to observe the following cryptic sequence of characters on the screen, the meaning of which will become clear in the final level of the game: