Father Mosquito:

Enable the "Mother Mosquito" code. Then, hold L2 and
press Up, Right, Left, Down, Square(2), R2(3) at the
character selection screen.


2 player mini game:

Hold Start + Select on controller 2 after turning on
the system. Press Square to move forward, X to jump
and Triangle when the power meter is full to do a 
super attack.


Mother Mosquito:

Hold L1 and press Up, Right, Left, Down, Square(2),
R1(3) at the character selection screen.


by unknown