Psychonauts in the Rhombus of Ruin is a virtual reality adventure game developed and published by Double Fine Productions.

As Raz, the player always remains in a seated position, and may interact with characters and objects in the world using his psychic powers such as telekinesis and pyrokinesis.

Using his Clairvoyance ability, Raz discovers Truman is being held at an abandoned Psychonaut research facility in an oceanic region known as the Rhombus of Ruin (a play on the Bermuda Triangle), built to study a large underwater deposit of Psilirium (a fictional element variant of Psitanium that can distort psychic powers and creates illusions).

Using his psychic abilities to explore the junk-filled ocean, Raz finds Sasha, Milla, Lili and Oleander trapped in Psilirium-induced hallucinations.

The process removed his psychic powers and drove Loboto insane, leading to his commitment at the Thorney Towers asylum.

The game ends with the team flying back to their Motherlobe headquarters as Lili tells her father about their adventures, shocking him with the revelation that Raz is her boyfriend.