A secret object that you can find everywhere DOOM: Eternal are cheat codes. You can use these cheat codes when you repeat missions in the game to change the way you play them, such as having endless bullets or having access to a certain switching on at any time. However, all are hidden and some are difficult to locate.

You will have access to the location of this cheating code when entering the sewer location, immediately after jumping a ravine to access a metro car. Here you will find tentacles for the first time and will have to face them in this area. Follow the journey of the game until you have to go to the left, and there is a block on your right with nowhere to go.

You must jump on the block to access a ventilation duct. The tree is blocked by a destructible vent, which you can quickly mix. On the other side is the first cheating code. Enter it and the path that previously blocked this location will open for you. You will land near where you started in the sewers and can go back to go back to your way.

There are 14 cheat codes that you can find in total. Keep an eye on them on your card and stay vigilant on their location.