Getting to the Red Key Slot (2)

The Ledge: You'll need to get up onto a ledge. Look for one of those slanted columns – hop up on it and then jump across to the ledge. Once you're up there, check the left side for two boxes of Chaingun Cannon Ammo, and on the right, you'll find some Pistol Ammo and a few Pipebombs. Keep moving fast because there are lasers firing at you!

SECRET 5: While you're on this ledge, look towards the middle. You'll see some ramps. Run up them – it looks like you'll hit a wall, but it's actually an invisible one! This leads you into a small hallway where you can grab three Atomic Healths. Nice find!

SECRET 6: Now, head to the side of the wall that's closest to where the Red Key is. You'll see a big crack in the wall. Blast it open! Inside, you'll find some Steroids. If you're feeling adventurous, there's another crack at the end of this little crevice. Blowing that one up gives you early access to Cell Block 1, which means you can get there even earlier in the level. Once you've grabbed everything you need out here, head back to the control room and make your way to one of the Red Key doors.

Rotating Room (Left Door): If you choose the left Red Key door, you'll find a Small Medikit and a Pig Cop waiting for you.

Rotating Room (Right Door): If you went through the right Red Key door, you'll just find some Pistol Ammo.

The Rotation Button: No matter which door you took, you'll need to get to the button at the top of a ramp. Pressing this button will make the room start to rotate. Watch out, there's a Pig Cop here too! You'll also see a holographic Battlelord head on a stand – on that stand is a Chaingun Cannon. Hit the button again to make the room rotate.

Exposed Doors and Grate: After the room rotates, you'll see three doors and a grate become visible. You'll want to break open that grate. Inside the vent, you can find some Body Armor. Just be super careful: there's a hole in the floor that will drop you all the way back down to the beginning of the level. Don't fall in!