Alternate Sounds
At the Main Menu press L1, R1, L2, R2, L1, R1, L2, R2. You`ll hear a sound acknowledging the correct code entry. You can do this multiple times to cycle through six different sound sets.

More characters
At the Main Menu enter: L2, R2, L2, R2, UP, RIGHT, DOWN, LEFT, L1, L2.

Change Ball Shape
Press L2 + R1 + Triangle when the swing meter is on screen. Use left and right on the d-pad to change the shape of the ball.

Left Handed Player
When selecting a character, hold SELECT + L2 and press X. Your character will swing left handed.

Unlock All Characters
At the main menu press L2, R2, L2, R2, Up, Right, Down, Left, L1, R1. Unlock Sam, Meg and Steven.