Ten lives: Hold Select + Start + A + B
on controller one and A + B on controller two. Power
on the NES while those buttons are held. Release the buttons when
the title screen appears. Then, hold A + B on controller
one and B on controller two. While keeping those buttons
held, press Start on controller one.
Bonus life: Stand in a moat and kill seven ninjas with your character's
sword. Catch the blue creature that appears to receive a bonus
life.
Level skip: Press Select(6) at the level 1 introduction
screen to advance past the level.
