Super Hard difficulty:
To unlock Super Hard difficulty, beat the game on the default difficulty setting.

Challenge rooms:
Unlock the following challenge rooms by entering the corresponding sequences of buttons at the “Press Start” screen:

CHALLENGE ROOM – CODE
Aaron Sedillo challenge room – right, down, left, up, L1, R1, triangle, triangle, X, X, start.
EuroGamer challenge room – down, up, down, up, left, L1, square, L1, square, triangle, start.
GamesRadar challenge room – R1, triangle, square, square, up, down, L1, L1, Up, Down, start.
IGN.com challenge room – up, down, triangle, square, square, triangle, down, up, L1, L1, start.
Major Nelson challenge room – L1, square(3), right, down, L1, left, triangle, down, start.

Trophies:

Bronze trophies
Cat burglar – Get to the boss of Area 05 within one minute and thirty seconds.
Clean as a whistle – Clear Area 02 without touching a slime blob.
Faster Than a Speeding Bullet – Block 100 projectiles using the claw.
H4