New Difficulty
Complete the game once to get the hardest difficulty.

Secret Rooms
At the game’s title screen/Press Star screen, enter these to unlock the secret room below.

Aaron Sedillo Room - Right, Down, Left, Up, L1, R1, Triangle, Triangle, X, X, Start
EuroGamer Room - Down, Up, Down, Up, Left, L1, Square, L1, Square, Triangle, Start
GamesRadar Room - R1, Triangle, Square, Square, Up, Down, L1, L1, Up, Down, Start
IGN.com Room - Up, Down, Triangle, Square, Square, Triangle, Down, Up, L1, L1, Start