Hold Turbo and move joystick up and down rapidly on VS screen before releasing it.
Enter these initials for big fun. Whoo...
PJP 11/2 - Invisible Team
MJT 3/22 - Smiley Team
LAN 9/10 - Special Team
JBP 5/17 - All Special Teams
Beach Ball Mode:
Enter pass, pass, turbo, extreme, turbo, pass, pass before tip-off