You can play all the Half-Life levels that Gordon Freeman went through as Adrion Shepard, but in the lab none of the scientists will talk to you.
Hidden audio
Approach the Boss of Opposing Force to hear backwards audio composed of the phrase "To win the game you must kill me Randy Pitchford" when played correctly. Randy Pitchford is the leader of the development team at Gearbox Software.
Load the game with the "hl.exe -dev -console -game gearbox" command line. Then while playing a game, press ~ to display the console 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 Adjust gravity sv_gravity [-999 - 999999] Spawn indicated item /give [item name] Spawn indicated weapon /give weapon_[weapon name] Spawn indicated ammo /give ammo_[ammo name] Map select /map [map name]
Weapon names
Use one of the following weapon names with the "/give weapon_[weapon name]" code: