Area Change in 2 Player Mode:
Both Players must do this at the same time.
It is really simple, just go to a flat wall and
run against it for a minute or two and it will
open up to a new area of that level. Hint,
some levels like the bamboo thicket do not
work in this situation.
Enable Katze:
To play as the awesome boss with the gun
(Katze) beat slash mode on hard without
continuing. He is selectable in 2 player
mode only.