Mind Maze is a "location" in Project Darwin. Plug Finster's head into the Mindlink at Project Darwin Upper Level. The one Ranger doing this must have the skill Cyborg Tech.
Inside Project Darvin in Darwin Village, you must take Finster's Head to a room on the righthand side of the map. Using Cyborg Tech on a disbanded character, that character is then transported to the Mind Maze.
Once inside, this character will face a series of challenges as you proceed from room to room. You will face a few fights including the Night Terror, which if you can kill is worth 32,000 xp (double if you kill it in melee).
Various points will ask questions; these can be easily looked up for the trivia, or worked out for the math. There is a point of no return late in the maze as well. You are warned when you reach the tiles leading to it.