Among the many secret collectibles in DOOM Eternal are the 14 cheat codes, scattered throughout the game's missions.
The vast majority of these codes offer a huge advantage in combat, some are harmful, and others are simply cosmetic. You can use them to redo the missions without harming your progress and pick up the items you missed.
Only the Slayer Doors are unavailable when you use a cheat code. Some successes even involve completing a mission with a code activated.
DOOM Eternal: Play DOOM on the Old PC
By bringing them all together, you can reach your room in the Fortress of Destruction and use a very old computer on the right, on which the very first Doom game will have been installed. It seems possible to play it, and it is even possible to enter codes.
Unfortunately, as of this writing, launching the old DOOMautomatically closes the game, we have been unable to verify what the game has in stock. This may be fixed by the time you read this article!
