All codes from the original Half-Life work here also (despite the map
name of cause). The cheat mode here can be activated with the command
line
hl.exe -dev -toconsole
and with typing
sv_cheats 1
in the console in the game of cause.
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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.