Psychonauts - Platform: XBox

All Psi powers:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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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:
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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.