All options:
Press Z, B, A, L, A, Z when a character profile appears during
the story introduction. A voice will say "Perfect" to confirm
correct code entry.

Enable all costume colors:
Press Z, B, A, Z, A, L when a character profile appears during
the story introduction. A voice will say "Welcome" to confirm
correct code entry. Press Up or Down at the character select
screen to display all available colors.

Fight as Gargos:
Press Z, A, R, Z, A, B when a character profile appears during
the story introduction. A laugh will confirm correct code entry.
Gargos will be accessible in the character selection screen.
Note that Gargos can not be selected in training and focused
training modes.

Display ending credits:
Press Z, L, A, Z, A, R during when a character profile appears
during the story introduction. The credits that are normally
shown only after winning the game will be displayed.

Random character select:
Hold Up and press Start when selecting a character.

View the high score screen:
Press Z at the main menu.

Level and music select:
Press one of the following button combinations when selecting
a character in two player mode. The first player to enter a
combination will choose the level. The second player will
choose the back ground music.

Code        Level or Background Music
--------------------------------------------
UP + QP     Wolf Castle
DOWN + QK   Bridge
UP + QK     Stonehenge
DOWN + QK   Dojo
UP + MP     Jungle
DOWN + MP   Dungeon
UP + MK     Museum Down + MK Spinal Ship
UP + FP     Space Ship
DOWN + FP   Street
UP + FK     Helipad
DOWN + Z    Sky Stage

Note: To play in the Sky Stage, both players must press the
DOWN + Z combination.