Cooperative Testing Initiative: Difference between revisions

This is the final course that unlocks after the completion of Course Four. Upon entering, GLaDOS will chime in the explain the purpose of the testing and what their true purpose is. The players are then dropped into the ancient Aperture testing spheres, encountered during single player, and must make use of all elements from the previous chambers along with the Gels that are found in the course. The final course is very difficult, requiring both players to act as a true team. {{spoiler text|The last chamber is halted by a large vault door, which holds the frozen humans inside. The players must unlock the door via the "Wave" gesture to ultimately unlock the door.}}