

Note: For games that were downloaded from Steam, to use cheats in Single Player mode, start the game with the " -applaunch -dev -tconsole" command line parameter. Also, any code can be used as a command line parameter by prefixing it with the "-" character. Then, enter one of the following codes to activate the corresponding cheat function. Type " sv_cheats 1" and press to enable cheat mode. While playing the game, press ~ to display the console window. Double click "Half-Life 2: Episode One" to start the game. Click the "Launch Options" button, then type " -console".

Right click on it and select "Properties".

Open Steam, go to your "Play Games" menu, and select Half-Life 2: Episode One. Then, start a new game and choose a level to get an option to play it with an audio commentary track.
