The exit door may be closed and require a button to be held down to open, or atop a higher platform out of reach, or may not be immediately visible. Most puzzles involve traversing through a series of rooms to reach their exits. Glenn Pierce, on how to escape from the dream. The player-character is a participant in a dream therapy program, but during the study, the character becomes trapped in a recurring dream cycle, and is guided by the voice of the study's overseer, Dr. Superliminal is a puzzle video game played from the first-person perspective.