So basically, in GZDoom, the original cheats are just a 'tolerated' feature from the past, whereas the console is the main feature for customization, cheating, debugging etc. The commands supported by the console are different from the original cheats, but their number and flexibility is far larger - see here. you want to cheat in and include the words cheat codes to find code lists. Instead, GZDoom has a console which you can open, type commands into it and execute them by pressing enter. Super Mario 64 DS - Action Replay Codes US The following are known Action. GZDoom keeps the original cheats only for convenience + compatibility purposes, and doesn't allow to define new ones like that. These 'simple commands', which you directly type on the keyboard while playing, are how the original Doom engine handled cheats.

Are you saying there is not a command to just add in the Demon Keys and what I would need to do is spawn a character than add some parameter in there that he has all 3 demon keys? Was kinda looking for a simple command (like IDFA) to get all 3 demon keys without having to go through all 3 secret levels.

Doom 64 cheat codes