DOOM + DOOM II

Easily done in the first Doom on the short mission E3M1: Hell Keep.

After the narrow hallway filled with Pinkies, you'll enter a room with 2 health and 4 armor pickups all next to each other (so 6 in total). Pick them up and proceed through the door, kill the imps and end the level.

Note: you can turn off enemies under "Difficulty Modifiers" via level select, if needed.

Doom 1 -> E3M1 & I'm too young to die difficulty

Kill 1 enemy in the opening area. Open the door (left skull by the door)

(Optional) follow the left path to pickup the shotgun. The path falls away, just run to the end, go left and run back, you'll take a little damage but there are lots of med kits

Backtrack take the right path, kill 3 enemies (if you don't have yet this is a good place to get it)

Open the next door, kill the pinky in the hallway

Pickup 2 potions & 4 armour in the room at the end of the hallway

Open the door, kill 3 enemies and *stop*

The wall left of the door is the level's only secret. Grab the rocket launcher and head into the next door for the end of level portal

You'll also earn:

Doom 1 -> E3M1 & I'm too young to die difficulty

Kill 1 enemy in the opening area. Open the door (left skull by the door)

(Optional) follow the left path to pickup the shotgun. The path falls away, just run to the end, go left and run back, you'll take a little damage but there are lots of med kits

Backtrack take the right path, kill 3 enemies (if you don't have yet this is a good place to get it)

Open the next door, kill the pinky in the hallway

Pickup 2 potions & 4 armour in the room at the end of the hallway

Open the door, kill 3 enemies and *stop*

The wall left of the door is the level's only secret. Grab the rocket launcher and head into the next door for the end of level portal

You'll also earn: