Ka - Platform: Playstation 2

In-game reset
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Hold L1 + L2 + R1 + R2 and press Start + Select during game play.

Mother Mosquito
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Hold L1 and press Up, Right, Left, Down, Square(2), R1(3) at the character
selection screen. A shout will confirm correct code entry.

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. A shout will 
confirm correct code entry.

Two player mini-game
--------------------
Hold Start + Select on controller two 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. Alternately, hold L2 and continuously rotate 
the Right Analog-stick clockwise at the title
screen.

Year 2
------
Fill each of the sixteen Ex Tanks to unlock Year 2.

Special costume
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Unlock all alternate costume colors on every level.