deepspace8

This secret level is accessed from level 15 "Peak Facility". There are two exits in this level. The main one proceeds on with the main storyline with level 16 "Natural Supply" and the secret exit, taken here, goes on to the second secret level (level 32) "Dark Roof".

Due to neverending respawns, 100% kills is not practical, but it's otherwise complete.

This is the second secret level that's access from the first secret level (level 31), entitled "Meat". The exit at the end of this level goes back to the main story with level 16, "Natural Supply".

There are two exits in this level. The main one proceeds on to level 16 "Natural Supply". The hidden exit (which is taken here) proceeds to the secret level (level 31) "Meat".

Note for Level 27: I could not get to the lost souls on the very top of the mountain, so I first complete this level minus those two kills, but then reload the game just before, IDCLIP to gather the final two kills, then finish the level again at 100%.