Quake

PC PLAYERS:

Edit: new video guide courtesy of Reabo
1. go to new game
2. select single player and Dimension of the Machine. Start. Walk through the easy or any difficulty portal (I think this needs to be done for it to register. At the least you must start Dimension of the Machine)
3. Hit the ~ key and enter "map mge1m1"
4. turn on "god" and "noclip"
5. The exists in this level are pipes. Not portals, to arches, or teleporters like the all the other levels in Quake. You are looking for a pipe that is underwater. Head towards the center of the stages. You will see a roundish area. On the bottom level are two of those spider creatures that shoot those spikey balls at you. This is the spot you need to get to. It will be surrounded by a mote of water go in the water and you will see a pipe with bars over it, that is the pipe you want. Go just past the bars and turn off noclip. It should finish the level and the achievement will pop. (If you are clipping in the side of the wall or pipe or bars you will respawn somewhere else, usually the start of the level, so just making sure you are not halfway touching a surface when you turn off noclip)

The secret exit for Dimension of the Past is found in MGE1M1: The Pain Drain. This is a written guide + images to find the secret exit, a video clip is also provided at the bottom if you prefer.

As you make your way through this level you will come to an area with a circular lift that you activate. This gives access to two rooms, one on the lower level, one on the higher level.

Head to the side room on the higher level. In here there are two S switches on the wall for you to shoot. One is on the right as you enter, the other is on the opposite side of the room, both on the outer walls.



Now go back to the lift and drop down to reach the lower room. You will pass through an area very similar to the room you were just in, into a larger area. In here on the left before going up the stairs is another S symbol tucked away in an alcove near some shotgun shells.



Now head up the stairs and again tucked away in an alcove is the last S symbol, near a gold key door.



Now head back to the lift again and take it to the higher level. If you turn 180 you will see a door has opened revealing a biosuit.



Take the biosuit and push the button on the ground under it. Now turn 180 again and drop down the lift, there is corrosive water surrounding the lower level. Underneath the wooden planks is an underwater gate that will open.



Head through the tunnel to reach the secret exit.

To unlock this room you need to shoot 2 S plates in 2 different areas. I recommend you clear the level of monsters especially playing on nightmare.

Area where you obtain Silver Key:
1. Enter the room turn right and look to your left shoot the S plate
2. Follow the room around turning right twice. You should see the S plate and shoot this one and you will be done here.

Silver Key Room:
1.:On the ground floor look in a area to the left of the wooden steps. Shoot the S plate on the room to the right
2.Cimb the wooden stairs and on the next floor you will have a similar area you can walk to. Shoot the S plate on the right wall.

With that unlocked:
Go back to the main pump area and enter the lift and land on the first floor(Opposite where you got the silver key).
Hit the floor switch and grab the Biosuit.

Jump down into the acid once the game states the underwater gate is unlocked.

Swim through to secret exit when prompted.

I have made a video below if anyone need a visual reference

Please drop a like on the video if it helped :)