Continue game play: Press A or B within ten seconds of losing
all energy.
Power-up: Enter NTTMMNWLPPBDZ as a password.
Bonus lives: Stop the game after dropping below two lives remaining
to obtain a password. Replace the fifth character of the password
to N, then resume the game using the modified password
for three lives. Replace the fifth character of the password to
J, then resume the game using the modified password for
two lives.
