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Zoom on every weapon
Get the Crossbow in single player mode and do a quick save with the weapon that you want to zoom in with. Change to the Crossbow and zoom in, then quick load and your other weapon will be zoomed in. You can now change weapons and they will all be zoomed in. To come out of zoom, change back to the Crossbow and press the second fire button until it zooms out again
HEV suit falls out
Enable the /impulse 101 code while in mid-air and an error saying the hev suit has fallen out will appear
Using guards
If you have a guard, get him close enough and he will take care of almost anything for you. The only time you ever need to fire is if the creature is close to the guard
Monster creation
You must be within the loading area of the desired monster for this cheat to work. For example, you cannot load up Barney while fighting the Nihilanth. Enter give and the corresponding monster will appear. Note: Activate the /noclip first, or you will be stuck inside the monster.
Completing We've Got Hostiles quickly
As soon as you enter the "We've Got Hostiles" level, turn to your right and use the /noclip code to float through the glass window with the security guard being eaten by the zombie. When you are in there, press the switch that opens the Silo and the Silo door will open. Float back out of the room, disable the noclip code, then go through the Silo door to start the next level
Saving ammunition
Do not waste precious pistol ammo on headcrabs. Use your crowbar, as it is more useful
Spawn Grunts
Enable cheat mode, then use the /impulse 76 code to activate the Grunt-O-Matic. A message to start a new game in order for it to work will appear. If you want to continue where you currently are, just quicksave, then quickload the game. Once you have quickloaded, type in the code again to spawn a Grunt. Note: You must have the /nocliping code on before you spawn the grunt because he will be spawned close to you. If this is not done, a message stating that the monster spawned is stuck in a wall may appear and the game will end. Do not spawn the Grunt in a closed position or the same message will appear. The Grunt you spawn will see you as a hostile. To have more fun, use the /notarget code and spawn a number of grunts to do your alien hunting
Grunt smell comment
In the first level, enable the /impulse 101 code and go to either one of the two security officers (Barneys) guarding an area. Use the /impulse 76 code to spawn a Grunt near them. Do not spawn the Grunt in a wall or Barney or the game will end with an error message. Kill the Grunt quickly and leave it on the floor for a few seconds. Barney should say "Ew, what's that stench?" or something similar
Talk to dead man
After the accident, when you go to the area where there is a scientist sitting on the floor and another is comforting him, enable the /impulse 101 code. When the man that is sitting down is talking, beat the standing man with your crowbar until he dies. When the old man is done talking, the dead man will talk to you.
When you are done with the first part, after all of the destruction starts, you will be in a room where two scientists let you into the machine that you put the sample in. If they are dead, then this trick will work -- it is after the accident, and not before. Enable the /impulse 101 code and use the eye scanner that is lop sided, next to the door. Go through when it allows you to and you should see a scientist giving Barney CPR. Use any weapon, preferably the crowbar, and hit Barney. He will talk even though he is dead on the ground
To enter cheat mode (alternate)
Start the game with one of the following command line parameters to activate the corresponding cheat function.
Command Line Parameter Effect
-console Press ~ during game play to activate console
-numericping Alternate latency display in v1.0.0.8 or later
-nointro Bypass opening FMV sequences
-noip Disable dial up networking box during LAN play.
-wavonly Disable DirectSound
-noipx Disable IPX errors during LAN play
-dev Enable developers mode
-heapsize Force amount of RAM available to game
-startwindowed Windowed game play screen
Barney gets cut in half
When you enter the room where the lasers are shooting out the walls, run through. There should be a Barney (security officer) on the floor. Watch carefully and you can see the laser go across and literally cut him in half
