Geeses Hidden Costume
At the Character Select screen, highlight Geese. Hold the START
button, and press circle or X to play as Geese in his black suit
(square and triangle will give you Geese in a dark brown
suit).
Geese Ending 2
To get Geeses 2nd Ending, you must beat the game with Geese wearing
one of his suits. The only difference between his 1st ending and
his 2nd, besides the fact that hes wearing a suit is that Geese
doesnt smile after walking away.
Billys Ending 2
To get Billys 2nd Ending, beat the game with Billy wearing his
other costume.
Play as Mr. Karate
Beat the game with everybody and win without losing at least once
to get Mr Karate.
Play as Duck King/Bonus Modes
Beat the game with Mr. Karate, Duck King will appear on the left
side of the question mark meaning he is playable. Also after doing
that, the team battle mode option and data mode will appear.