Mother Mosquito
At the character selection screen, hold L1 and press Up, Right, Left, Down, Square(2), R1(3). If you entered the code correctly, you will hear a shout.

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. If you entered the code correctly, you will hear a shout.

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.

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Game Shark Codes

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Master Code (Must Be On) 0E3C7DF2 1853E59E
EE886932 BCB95112

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Max Health CEA56CF2 BCA99BAB

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Max Hearts CEA563FE BCA99B97

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All Colors CEA642D6 BCA99A82

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All Extra Tanks CEA6408E BCA99B93

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100% Extra Blood CEA6404A BCA99BD3

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Quick Suck'n CEA5639C BCA9DD83