Doom Eternal

Doom Eternal
Developer: id Software Publisher: Bethesda Softworks Platform: Windows Released internationally: March 20, 2020 Released in JP: March 26, 2020 This game has unused areas. This game has unused items.

Wherein the Doom Slayer meets his most horrible nemesis yet: An actual plot.

Cut Weapon

Using a memory editor like Cheat Engine to enable console commands then using the command g_enablepistol 1 will let you use an otherwise unused Pistol weapon, which, surprisingly, is actually new and not just a leftover from Doom (2016). Primary fire is a three-round burst, while alt-fire zooms in for a more powerful shot.

Developer Room

In the "Mars Core" mission, glitching or cheating your way back into the area the opening cutscene plays and touching the door you initially emerge from at the start of the cutscene will teleport you to the level's Developer Room. This small, greyboxed room contains teleporters to each section of the level, teleporters to the start of the level either with or without the intro cutscene, and a BFG-9000 pickup.

Interestingly, the "PHOBOS: Supergun" teleporter takes you to an area that's only seen as part of a cutscene in the final game, but is fully set up as a playable area with collision and a "bottomless pit" trigger for if you jump off.