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Load game with the command line: hl.exe -dev -toconsole. Then, press ~ if the orange text on the screen does not disappear. During gameplay, press ~ to display the text prompt and type in sv_cheats 1. Press ~ and enter one of the following console commands to activate the corresponding cheat function.
|No clipping mode||/noclip|
|Opponents ignore character||/notarget|
|All weapons and ammo||impulse 101|
|Map select||/map <map name>|
|Third person view||/thirdperson|
|Adjust gravity||sv_gravity <-999 - 999999>|
|Obtain item||/give <item name>|
Enable cheat mode, then activate the /map redE3M5 code to advance to episode 3, mission 5. Locate the door that does not have a handle in that level. Enter the /noclip code and walk through the door to find another door covered with smiley faces.
Security officer shooting
Shoot the security officer after putting the HEV suit
on and collecting weapons from the storage room. He will say things
such as "What do you want your tombstone to say?" or
"I dont want to do this...".
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Killed by auto-turrets
Shoot the weapons man or the science technician. The alarm will go off and auto-turrets will deploy from the roof and take you down.
Close the teleportation door on the lab technician. He will not open it back up. After teleporting to the mountains, look to your right. The scientist will be floating. Watch him for a moment and he will walk in place in mid-air. Note: You can kill him.