Hidden door
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. Start the game with the command-line "-dev -toconsole" (eg, hl.exe -dev -toconsole). If the orange text doesn't appear, press ~. During gameplay, press ~ and type sv_cheats 1 to enable cheat mode. Now, press ~ and enter any of the following "Codes": /god God Mode
/noclip = No Clipping
/notarget = Opponents Ignore Character
impulse 101 = All Weapons and Ammo
/map (map name) = Map Select
/thirdperson = Third-Person View
sv_gravity #### = Adjust Gravity to -999 to 999999
/give (item name) = Obtain Item