DOOM 64
10 Achievements
1,000
1-2h
Persistence is the Key
Acquire all 3 Demon Key Artifacts in the main campaign
125
5.23%
How to unlock the Persistence is the Key achievement in DOOM 64 - Definitive Guide
Using this password starts you in the secret level “The Lair” with max items except for the second Demon Key, which is the one you pick up in this level.
For this level you start out in a locked room. Interact with the blue door behind you, which causes the other doors to open where there are two enemies. Kill them and go outside to grab the blue key, then go back and open the first door. Kill the enemies in the next room, then interact with the one wall section that looks different from the others to drop down the stairwell. Go down and interact with the left skull image once, then the button it drops down to go into the next room.
Kill the enemies in the next room, then interact with the button on the rounded section of wall to drop the stairs leading to the outer area. Kill the enemies up there, then go up and stand between the two rooms facing the blinking star in the middle. Here you want to interact with the button in the left room, then walk to the right room facing the same direction. When you enter the right room you should now see a button on the far wall near the doors you came in, shoot that button. After you shoot it turn left and look through the smaller square window going into the next room where there will be another button to shoot. If done successfully this drops the Demon Key in the middle of the room for you to pick up.
If it doesn’t drop or the buttons don’t show up you can hit the first button again to retry. When you pick up the star the game will recognize you now have all 3 due to the password you used, awarding the achievement
https://m.youtube.com/watch?v=aQ_4sCzGUXE
Almost like a pressure plate shooting gallery. You can hear the buttons drop.
Acquire All 3 Demon Key Artifacts - 6:00
Achievement Walkthrough - Quick/Easy Method:
Demon Keys are found in the secret levels 'MAP29: Outpost Omega', 'MAP30: The Lair' and 'MAP31: In the Void'.
From the main menu, select 'Options' then 'Password'. Type in V87L 7C28 BDT1 59VB. You will spawn on 'MAP30: The Lair' on 'Be Gentle' difficulty with 200 Health, 200 Armor, all weapons and full ammo. It also spawns you with two of the three Demon Keys. The purpose of this level is to acquire the final Demon Key.
When the level starts, open the door to the left or right. You will be met by an Imp. Kill it and a few Lost Souls will spawn. Kill them then work your way around to the other side and kill that Imp. A pedestal with a blue key will appear, so grab it and open the blue door inside the starting room. You will be attacked by a Spectre, so when you’ve killed it, facing away from the blue door, turn right and interact with the middle wall panel (it looks different than the others) to lower the stairs.
Go down into the courtyard and interact with the demonic-looking wall panel to the left or right. The panel will slide open revealing a demon switch, so interact with it and two doors will open. You will have to contend with two Hell Knights, and when they are killed, walk inside the new room (you will see the Demon Key sitting on the top of a pillar). When you enter the room, turn around and you will see a switch on the curved portion of the wall. Interact with it and three sets stairs will appear to the left, right and behind you. Climb any of the stairs and kill the two Nightmare Imps on that level. Once that is done, all the enemies are dead.
Facing the center set of stairs, move over to the right to a small room. When you enter the small room, a wall in front of you on the far side of the larger room (where you entered from the courtyard) will open revealing a demon switch. You need to shoot it to interact with it (the Chaingun works well), and when you do, immediately turn left and through a small window, another switch will be revealed in the room to your left. Shoot that quickly to lower the pillar to retrieve the Demon Key, unlocking the achievement.
If you don't shoot the first switch in time and the wall closes, simply back out of the room and reenter. The wall is activated by an invisible barrier when you enter the room.
Thanks to WhiteshirtGames for the video:
Demon Key Artifacts, when collected, increase the power of the Unmaker weapon. The can be found only in the 3 secret levels in the game, which are access through secret alternate exits from levels 4, 12 and 18 of the main game. Use password "V87L 7C28 BDT1 59VB" to start Level 30 'The Lair' with 2 of the 3 Demon Keys, you will need to only collect the third key from this level to unlock this trophy.
Follow the video guide below to find the third demon key:
V87L 7C28 BDT1 59VB
You start with two keys at once. Go a little further along the level. Get the key and trophy.
Level 04: Holding Area access to the first secret level with artifact 29: Outpost Omega Video
First artifact at level 29 : Video
IMPORTANT!!! The video with the first artifact does not indicate one necessary detail. To open the door to the artifact, you need to pick up the red key in the room with 4 hell knights in cages. In order for the wall with the key to open, you need to click on the display in the room with the cages, it is highlighted in yellow (located immediately at the entrance to the room on the right side, when viewed from the start of the level)
Level 12: Altar of Pain access to the second secret level with artifact 30: The Lair: Video (Exit immediately after picking up the yellow key)
Second artifact at level 30 : Video
Level 18: Spawned Fear access to the third secret level with artifact 31: Into the Void: Video (Repeat step by step after video)
Third artifact on level 31: Video
Please note that the numbering in the videos of secret levels does not start from the first. The first secret level has nothing to do with demon artifacts.