Ammo Boost: After collecting the jump boots, exit the room and turn right.

Head to the left of the furthest one and climb onto it to find this trial.

Dazed and Confused: After destroying the third Argent filter, you'll pass through a chilly hangar with a couple of large transport vehicles ahead and to the right of where you enter.

Vacuum: After passing through the airlock, drop through the broken railings to the left and follow the trail of green lights up and around some platforms to find this.

Doom - Rune locations: Where to find all Rune Trials for permanent perks If you're interested in other hidden things, our Doom secrets and collectibles guide can help. Before you can do that, though, you'll need to find the Runes themselves, and the locations of all 12 are listed below. There are 12 in all, and to activate each one you'll need to complete a particular challenge, such as killing a certain number of a certain kind of enemy with a certain weapon.

Runes are some of the most fun and potent upgrades in Doom you eventually get three slots to equip these permanent perks, which can affect everything from ammo to movement.

Doom shut down the portal