Slayer power:
Press Y(3), Black(3), Y, White, Black(2), White, Y at the extras screen. The sound of a scream will confirm correct code entry.
smupyftaic.

Unlimited health:
Press Y, White, Black(2), White, Y Black(3), Y(3) at the extras screen. The sound

OUR RATING FOR THIS GAME: 

(5 is best)