PLASMA-- Derived from different level from the Original Descent 1 game this has been pieced together to create one big level. It has no co-op starting points, only anarchy for playing with one person there are creatures that will hunt you down. This if a fun level for Multiplayer, but better played with four or more, but can be played with two....... DEATHMAT-- This level is a must for all Multiplayers, it has none stop action. Single player games can be played but no co-op starting points Multiplayer starting points are there. Becareful of the ending and pick the correct exit -- don't be contained