Invincibility:
Press Option 2 while playing the game to display the "Bomb Parts" screen
while not standing next to a monitor. Press Up, Right, Up, Left,
Down. You will hear a sound if you have entered the code correctly. REMEMBER: Repeat this
code to return to normal.

Weapon power-up:
Press Option 2 while playing the game to display the "Bomb Parts" screen
while not standing next to a monitor. Press Down(4), Right, Up,
Option 2 to set all weapons to full. REMEMBER: This code may be
repeated as needed.

Level select:
Press Option 2 while playing the game while standing next to a monitor.
Press Down, Up(5), Right. You will hear a sound if you have entered the code correctly.
Press Up or Down to change the level number that is displayed in
the lower right corner of the screen. Pressing Up or Down will also
toggle the score from "00000" to "00128" to indicate where the
starting location within the level will be the beginning or the
end. Press Option 2 to start game play at the indicated level.