Psychonauts
All Psi powers
While playing the game, hold L + R and quickly press B(2), Y, White, quickly click Left Analog-stick, quickly press Y. If you entered the code correctly, the phrase “You cheated” will be spoken.
Maximum rank and all Psi powers
While playing the game, hold L + R and quickly click Left Analog-stick, Right Analog-stick, Left Analog-stick, quickly press White, B, White. If you entered the code correctly, the phrase “You cheated” will be spoken.
All powers upgraded
While playing the game, hold L + R and quickly press B(2), Y, White, quickly click Left Analog-stick, quickly press Y. If you entered the code correctly, the phrase “You cheated” will be spoken.
All items
While playing the game, hold L + R and quickly click Right Analog-stick, quickly press B, White(2), quickly click Left Analog-stick, quickly press Y. If you entered the code correctly, the phrase “You cheated” will be spoken. Note: This does not unlock the Psi-ball Colorizer or Dream Fluffs.
Invincibility
While playing the game, hold L + R and quickly press B, White, B(2), Y, Black. If you entered the code correctly, the phrase “You cheated” will be spoken.
Full lives
While playing the game, hold L + R and quickly click Left Analog-stick, quickly press White(2), B, A, quickly click Right Analog-stick. If you entered the code correctly, the phrase “You cheated” will be spoken.
Full ammunition
While playing the game, hold L + R and quickly click Right Analog-stick, quickly press A, quickly click Left Analog-stick(2), quickly press Y, B. If you entered the code correctly, the phrase “You cheated” will be spoken.
Full Arrowheads
While playing the game, hold L + R and quickly press A, quickly click Right Analog-stick(2), quickly press White, Y, X. If you entered the code correctly, the phrase “You cheated” will be spoken.
New text
While playing the game, hold L + R and quickly press White, A, quickly click Left Analog-stick, quickly press White(2), B. If you entered the code correctly, the phrase “You cheated” will be spoken. This code replaces the characters’ names with developer names, shows captions for all the dialogue, and changes the text to numbers and symbols.
Bonus movie
Reach Psi Cadet rank 100 by collecting all Psi-Orbs, Psi-Cards, Cobwebs, Figments, Emotional Baggage, and scavenger hunt items to unlock a bonus movie.
Use Levitation without having it equipped
Have three Psi powers equipped, none of them being Levitation. Then, double-jump, hold L to glide, then press A while gliding to grab the Levitation Ball. This will work just as if you are using it normally. Note: You must have completed “Milla’s Dance Party” in order for this trick to work.
Defeating Jasper
To defeat Jasper in Gloria’s theater, use Pyrokinesis, Levitation, and whatever else desired. Use the Levitation Ball to float up the top where the lights are located. Jump and use the Levitation Float above the music note to get there. Use Pyrokinesis to light the candles and make Jasper dizzy. Go down and punch him until he is no longer dizzy. Repeat this to defeat him.
Defeating the Lungfish
To defeat the Lungfish in the first and second stages, whenever he blows out the yellow boxes, hit the one he starts to suck in. When in the final stage, stand by a clam. When he starts swinging the thing on his head, punch the clam shell, then punch him.
The image featured at the top of this post is ©Square Enix.