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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.
Cheat CodesLoad the game with the "hl.exe -dev -toconsole" command line. Then while playing the 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] |
