30 continues: Hold Select, press Run at the title screen,
and wait until the phrase "Area 1" appears.
Unlimited continues: Enable the "30 continues" code. When the
current game ends with 30 continues remaining, press Select,
Select, then hold Select + Run until the
game restarts.
16 lives, 36 bombs: Avoid and do not shoot the Boss at the end of any odd
numbered level. After the Boss leaves, 16 lives, 36 bombs, and
a double score will be awarded.
View ending sequence: Hold Right and quickly tap Run at the
title screen.
Mode select: Hold Select while tapping I, II
repeatedly at the title screen. Press Select to choose
between four difficulty levels. Begin game play by holding Run
and press Select. Alternatively, enable the Turbo switches
and press I + II to start the first part of the
code.
Sound test: Hold Select and alternately tap Left,
Right repeatedly until "Sound 01" appears.
Area 0, 30 continues: Enable the "Sound test" code. Press I,
II, Select twenty two times. Then, hold Select
+ Run until gameplay begins.
Debug mode: Enable the "Sound test" code. Press I,
II then tap Select repeatedly until the debug screen
appears. The following debug functions may now be enabled.
Level select Enter 00 - 09 as a debug number.
Invincibility Enter 77 as a debug number, then press Up, Down
before exiting the debug screen.
Half game with many satellites Enter 83 as a debug number.
Extra lives, bombs, and power Enter the debug number for the desired level. Hold I
+ II and press Start to begin game play with 10
lives and 10 bombs. Additionally, you will continue from the
previous location instead of the previous checkpoint after losing
a life.
