Bonus characters: Complete the game with any of the eight regular characters
to play as Zetton, Ace-Killer, Alien Magma, and Gomora. One of
those four characters will become available each time the game
is completed.
Special gallery: Unlock all four bonus characters. A "Special Gallery"
selection will appear under the "Gallery" option with
graphics and information about the bonus characters.
Super attack: Press Triangle + Circle + Square.
Information in this section was contributed by jon_gab.
