Psychonauts - Platform: Playstation 1

All powers:
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Press Circle(2), Triangle, R2, L3, Triangle.

All powers upgraded:
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Press L3, R3, L3, R2, Circle, R2.

Full ammunition:
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Press R3, X, L3(2), Triangle, Circle.

Full arrowheads:
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Press X, R3(2), R2, Triangle, Square.

Full lives:
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Press L3, R2(2), Circle, X, R3.

Invincibility:
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Press Circle, R2, Circle(2), Triangle, L2.

Global items:
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Press R3, Circle, R2(2), L3, Triangle. 

All items:
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Hold L1 + R1 and quickly press R3, Circle, R2(2), L3, Triangle during

New text:
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While playing a game, hold L1 + R1 and quickly press R2, X, L3, R2(2), Circle. 
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.

Defeating the Lungfish:
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To defeat the Lungfish for 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.