Start the game with the "-console" command line parameter. Press ~ to display the console window, then enter sv_cheats 1 before loading a game or level to enable cheat mode.
Use one of the following entries with the map <level name> code.
ba_canal1
ba_canal1b
ba_canal2
ba_canal3
ba_elevator
ba_hazard1
ba_hazard2
ba_hazard3
ba_hazard4
ba_hazard5
ba_hazard6
ba_maint
ba_outro
ba_power1
ba_power2
ba_security1
ba_security2
ba_teleport1
ba_teleport2
ba_tram1
ba_tram2
ba_tram3
ba_xen1
ba_xen2
ba_xen3
ba_xen4
ba_xen5
ba_xen6
ba_yard1
ba_yard2
ba_yard3
ba_yard3a
ba_yard3b
ba_yard4
ba_yard4a
ba_yard5
ba_yard5a
In the main lobby, go to the scientist talking to the guard. After they finish talking, follow the scientist to the top of the main lobby. When he goes to the side of the rail, jump over it. He will look down and say "My God, what are you doing?". When he says this, you should say in your head, "Killing myself". You can refill on health by going back up there and getting some drinks from the venders.
On the train (where you start) enable the noclip and impulse 101 codes. When the train drop you off at the little platform, look at the platform that you just passed. Fly over there, and if you get there soon enough pull out your crowbar. Hit him until he explodes.
When you just get out of the tram and the guard is having trouble opening the door, turn around. Eventually, another tram will pass by with Gordon Freeman inside it, which is the start of Half-Life.
Enable the impulse 101 code. Once you are in the main room, go to the bathrooms and open your locker. Take out a powerful weapon or a crowbar and crouch down and start beating (or shooting) the box. After beating the box with a crowbar over 50 times, or shooting it with a laser or some other powerful weapon, it will break open. There will be a little live alien in the box. You cannot do anything to it except look at it.
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