Super Heavy demons (arch-vile, tyrant, marauder, Doom hunter, baron of Hell) and bosses can’t be killed with the chainsaw. When you activate this switch, the pedestal where the blue key now rests will drop. Go to the one switch where those slabs are missing. To either side of 3 of these 4 switches are short vertical slabs rising out of the floor. How do you get the Blue Key In Doom 64 Level 2? Fight through the Imps and zombies in your path until you reach a computer terminal. You’ll start out on a linear path, fighting your way through dark rooms lit by swirling red emergency lights.
The chainsaw is located on Mission 2: Know Your Enemy.
It is finally found in a non-secret area on E2M6: Halls of the Damned. The chainsaw first appears in a secret area of the level E1M2: Nuclear Plant, and appears again in secret areas of E1M3: Toxin Refinery and E1M5: Phobos Lab. How do you get the chainsaw in Doom E1M2?