SECRETS in Six Ways to Die

Map 31:

1. In the chainsaw area, after you've crossed over the bridge into the room with the switch, look for a slightly recessed computer panel. Open it to access the secret area with the backpack.
2. In the shotgun area, when you get to the teleporter at the end, crossing the final step will raise a hidden door at the foot of the steps. Run back and enter the secret area before the door closes (repeatable). Press the switch at the end and return to pick up the invisibility sphere.
3. In the chaingun area, as you enter the lava cavern look to the right and you'll see a barely visible teleporter in the lava. Climb onto one of the platforms and leap to the teleporter, which will take you to the secret area with the radiation suit.
4. In the super shotgun area, before you drop down into the main combat area, steer right in the chamber with the pillars and find the lion's head switch. Press it to open the bars to the secret area with the soul sphere.
5. In the plasma rifle area, go along the main water channel and in the domed area right before you reach the Spider Demon area look for the satyr's face behind the green torch. Shoot it and run into the passageway to its left, and all the way around to the far end of the circular area. Jump through the door before it closes (repeatable), and walk into the teleporter to reach the secret with the light amp goggles.
6. In the rocket launcher area, keep raising the glass platforms until you come to the western-most switch. Look for a different texture on the right wall, press it to open a door, and walk into the teleporter to reach the secret platform with the megasphere.

Bonus: Finding all six secrets allows you to enter the super-secret level, Map 32. [Alternatively, you can simply warp to it using the cheat code: IDCLEV32]

Map 32:

1. In the outdoor area to the South-West of the map, when you first exit the building turn left and continue around. You'll see recesses in the walls with tall red columns. Find the short red column and step into the recessed section. The floor will lower, allowing you to reach the back wall. Press to open, and step into the teleporter, which will take you to the outside of the fenced area. Jump into the pool to pick up the megasphere.
2. In the vast hall with the arches, after you've picked up the plasma rifle turn right and go all the way to the end of the hall. When you go into the darkened passageway you'll trigger a trap, which opens a hidden door behind you. Go through that doorway, and walk through the fake wall to your left to enter the secret area with the invisibility sphere.