Power Serve:
Enter PWRSRV as a password. Then jump and press A, B(2), A while serving,

Double Handed Blast:
Enter DBLBLST as a password. Go to the net, and when your partner passes the ball to you, press A(2).

Spin Fury:
Enter SPNFRY as a password. Go to the net, and when your partner passes the ball to you, press B(2), A.

360 Killer Smash:
Enter KLRSMSH as a password. Go to the net, and when your partner passes the ball to you, press B(3), A.

Activate all combo moves:
Enter CMBMVS as a password.

New York level:
Enter NWYRK as a password. The New York level is now unlocked in single match and multi-player modes.