MAP04: Nucleus (Eternal Doom)

MAP04: Nucleus is the fourth level of Eternal Doom and was designed by Sverre Kvernmo. You have entered the loading zone and it is filled with crates. Once you find the red key you descend back underground into a sewage treatment area.

Walkthrough
You can get the backpack and the chainsaw on this level. The red key is obvious in loading bay 3. Hidden behind crates in a corner of this area is a lift to the gold key. To get the blue key, pass through the brown effluent downpour in a room off the underground tunnel (looks like a solid column but don't be fooled). The exit is a teleport pad in the central, underground rotunda surrounded by green killer slime. To get to it, throw the switch on the rotunda wall opposite the entrance (you will need full life points for this).

Secrets
When you find the yellow skull key, next to the room leading to it there is two small control rooms at its opposite sides. One has what looks like two blue doors (actually just decoration) and a switch in it. Push it and in the other one, the wall next to the control panel sinks down.

Also, in cargo bay 1, you will unlock a control panel. Pushing the button opens a door on the left hand side of the panel, you can see it on the map.

The previous level is MAP03: Inter-Base (Eternal Doom)

The next level is MAP05: Time Gate (Eternal Doom)