Blood Mode
At the Options screen, quickly press Y, X, B, A, L, R. The screen
flashes red to confirm the blood code. Don't expect to see buckets
of red, though.
Bonus Stage
On story mode (after defeating Voodoo), instead of going on to
fight Beast, go back to "The Lost Jungle" and hit Start.
This will take you to a bonus stage.
Character Select for Story Mode
At the option screen press these buttons very quickly; Up, Down,
B, Left, Right, B. Now you can play as another character.
Fight Beast in Story Mode
On the first island, go to the lower right-hand corner, walk down
the stairs and press Start to fight Beast. Submitted by Melvin
Banks
Remove Background
At the options screen press these buttons very quickly; Up, Right,
B, Down, Left, B. Go to DUEL MODE and when you start the game,
during the level press X + B at the same time. The background
will disappear.