Cheat mode:
Open Steam, go to your "Play Games" menu, and select Half-Life 2. Right click on it and select "Properties". Click the Launch Options button then type -console. Click "Ok", then close. Double click Half-Life 2 to start the game. Once it is loaded and you are playing, press the ~ key to bring up the console. Then, enter sv_cheats 1 and press [Enter]. You can now enter the following codes at the console window.

OUR RATING FOR THIS GAME: 

(5 is best)