DOOM 3: BFG Edition - Enable Console, Cheats & Skip Intros

1. In your Steam Game Library, find the game, right click it and click Properties.
2. Click the Local files tab.
3. Click the "Browse local files..." button to open up the game folder.
4. Open the "base" folder.
5. Press the Windows key + R to bring up the Windows run dialog.
6. Type "notepad" and press Enter to open Notepad.
7. In the open folder, drag the "default.cfg" file into Notepad.
8. Add the following lines to the bottom of the text:
• To skip the intro logos:
  com_skipintrovideos 1
• To enable the Console (appears by pressing the ` key in game) and cheats:
  seta com_allowconsole 1
  Note: This will disable achievements.
9. Click File -> Save and close Notepad.

Cheats (can be activated after bringing up the console)

• Doom 1 & 2
• Doom 3