The easiest/fastest way to earn this trophy is to use the password feature. Of course, some changes had to be made here and there, like some of the more advanced features had to be removed and the secret exit was taken out too.

Kill them all and then examine the chest on the right. Utilizing a different engine from what id Software created, the developers at Midway were able to pack denser geometry and better-scripted events into the game.
I thought I would port the first map of Doom 64 to Doom II using stock textures. The Absolution is the final stage of the original release of Doom 64 back in 1997. To reach Level 32-Hectic in Doom 64, you must start a new game. 3 sets of stairs will appear. ... After passing through the room behind the yellow door you will reach a place filled with demons. Walk up the middle set. The yellow key is right there in the middle of the start room, (in case you didn't already pick it up accidentally. Go through Level 1-The Staging Area, and destroy ALL the barrels, except the one to the right of the start. Doom Artifact 2; In The Lair level, get to the room where you see a Doom Artifact at the top of a huge pillar. Heads up that the stage begins in a room filled with every gun in the game so you can use this stage to get both My Cause is Just, My Will is Strong and Unholy Firepower. Now turn left and you will see an area with a wooden floor.

To get the artifact, flick the skull switch behind you.

Behind the yellow door are two more hell-knights. Doom Guide. May still be …
Mav3r1ck wrote:I've noticed something about the D64 colored lighting feature but I'm not sure if it's been discussed. 6 - Alpha Quadrant: New gate clips in this level save a little backtracking during the Yellow Key sequence as well as skipping the pillar (football) room that used to be a huge run ender. Down the stairway is the largest area of the level. Secrets. There are a total of 10.

The door set at an angle to the room has two hell-knights inside.

Doom Game Guide & Walkthrough by gamepressure.com. Game Guide. The last guard is lying in the corridor that leads to the last room in this level. The Doom series has always been home to a ton of secret areas, but the N64 exclusive Doom 64 took things to another level.