Fear Effect Codes -

Invincibility:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Triangle, Square, Right, Square.

Disable enemy AI:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Left(2), L1, L2.

One hit kill with firearms:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Triangle, Square, Down, R1.

Expert mode:
Select "Credits" at the options screen then press Down(3), Triangle, Down(3), Square, Left, Right for more challenging opponents.

Instant puzzle solution:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Down(3), Up.

Hint: Avoid damage:
Hold R2 and any direction on the D-pad and no enemies will be able to hit you.

Hint: Jin bomb puzzle solution on Disc 1 (wire cutter):
Get the wire cutter from the wire box. Cut the wires as follows:

Orange button: Cut red and yellow.
Pink button: Cut red and blue.
Green button: Cut blue and yellow.
Basically, cut every wire for each button, except the middle button. If you want to see what the patterns look like, exit the room and run around the corner. Then, run around it again. The color patterns should be there.

All weapons:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Triangle, Square, Up, Circle. All weapons for the current character and level will be unlocked.

Unlimited ammunition:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Triangle, Square, Left, Triangle.

Rapid fire:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Up(3), Down.

One hit kill with smack-jack, knife, or brass knuckle:
Select "Credits" at the options screen then press L1, Triangle, Up, Down, Circle(2), Triangle, Square, Down, L1.