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Playstation 2 - Ka cheats

Go to the character selection screen, the n type the following codes:
You will hear a sound, if the codes are accepted.

Unlock Mother Mosquito
Hold L1 and press Up, Right, Left, Down, Square, Square, R1, R1, R1. 

Unlock Father Mosquito
First you have to enable the "Mother Mosquito" cheat. 
After, hold L2 and press Up, Right, Left, Down, Square, Square, R2, R2, R2 


Unlock 2 player minigame
Turning on the system, then press Start + Select on controller 2.
Push Square to move forward, X to jump, and Triangle.
If you seen powr meter is at the maximal, do a super attack. 
or
Go to the title screen. Hold L2 and rotate the Right Analog-stick clockwise 
direction at the a few times.