Shield Parts: Two pieces sit on the ground outside both spawn doors, and the third piece is leaning up against the bunker to the right of the box.

Sliquifier Parts: Upstairs in the bunker at the base of a metal shelf. On the left of the walkway before entering the stairway building. On a bench on the bottom floor of the stairway building. In the buildable room for the sliquifier on a shelf (across from the third piece).

Apothicon Servant Parts: Two parts are on the floor outside of the buildable room in the stairway building, and one is in the buildable room in a sink. (It causes invisible zombies. USE WITH CAUTION aka don't use it)

Pack a Punch: Fill 9 blue bongs to the brim. A magical door will unlock.

Staff Parts: Fill souls on a door inside the stairway building. You need to walk across a sideways staircase to get to it. All parts and upgrade stations are inside. Build them on the top floor.

Boss Room: Fill souls on a sheet metal door across from the staff room. Once inside, grab the spherical key from the far side of the room and put it in the MPD. Kill zombies to fill the canisters. Once they're filled, grab the golden bong from the table near where you grabbed the sphere, then fill the boss. The buy-able ending is next to the pyramid and unlocks after the boss dies.

PERKAHOLIC: I'm not sure on the specifics, but it's something like this.. Go to the top of the bunker next to Widow's Wine and look towards the building closest to spawn. Shoot the flag on the right and enjoy.