Hidden doorEnable 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.Cheat codes
Load the game with the "hl.exe -dev -toconsole" command line. Then while playing a game, press ~ to display the console and type "sv_cheats 1" to enable cheat mode. Then, press ~ and enter one of the following codes to activate the corresponding cheat function:
| RESULT | CHEAT CODE |
| | God mode | /god
| | All weapons with full ammo | /impulse 101
| | No clipping mode | /noclip
| | Opponents ignore character | /notarget
| | Third person view | /thirdperson
| | Adjust gravity | sv_gravity [-999 - 999999]
| | Obtain item | /give [item name]
| | Map select | /map [map name]
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