Bonus characters:
Hold L1 and press Up(4), Down(3), Up(5) at the start screen. A volleyball will go from left to right, and splash on the sea to confirm correct code entry. Rocky, Superfrog and Fletcher are now unlocked.

Alternately, successfully complete all puzzle mode levels. Go to the volcano level in the middle to unlock Fletcher, Rocky, and Superfrog.

All tournament modes:
Hold L2 and press Up(2), Down(6), Up(3) at the start screen. A volleyball will go from right to left, and splash on the sea to confirm correct code entry. All of the bonus tournament modes are now unlocked.

Alternately, play the game in puzzle mode. As certain levels are completed (for example, Alien Attack), new modes in tournament mode will become unlocked.