You will have to be past level 30 and have bought the psi colo0rizer from the camp store. In Gloria's mind there will be many dark rooms so set your levitation ball to a bright color like white to help you see more clearly.
Be sure to use clairvoiance on every NPC you can find in the game... sometimes the way they see Raz is downright hilarious!
Some favs. are:
During gamplay, hold L1 and R1, then:
Circle, R2, Circle, Circle, Triangle, L2
Get All Powers
Circle, Circle, Trinagle, R2, L3, Triangle
Max Out Lives
L3, R2, R2, Circle, X, R3
Upgrade All Powers
L3, R3, L3, R2, Circle, R2
Get Global Items
R3, Circle, R2, R2, L3, Triangle
Max Our Arrowheads
X, R3, R3, R2, Triangle, Square
during the gameplay hold L1 and R1 and press circle,R2,circle,circle,triangle,L2