Two-Way Fire
While playing, hit: Up, C-Up, Up, C-Up.
Three-Way Fire
While playing, hit: Right, Right, C-Left, C-Down.
Four-Way Fire
While playing, hit : Down, Down, Up, C-Right.
50 Extra Lives
At the Setup menu, hit: Up, Up, Down, Down, Left, Right, Left,
Right, C-Left, C-Right, C-Left, C-Right.
Flame Thrower
While playing, hit: Down, Right, Down, Right, C-Right.
Game Boy Mode
At the Setup menu, hit: Up, Down, Right, C-Left, Down, Up, Left,
C-Right, Up, Down.
Level Select
At the Setup menu, hit: Down, Up, C-Left, Down, C-Left, C-Right,
Down, C-Right.
Radiation Spray
While playing, hit: Up, Down, C-Right, C-Left.
Shield
While playing, hit: Down, Left, C-Left, C-Right.
Speed Up
While playing, hit: Left, Left, Right, Right, C-Up.
Auto Play
At the Setup Screen, hit Left, Right, Up, Down, C-Left, C-Right,
C-Left, C-Right. Repeat this sequence two more times.
