Extra options: Press Up, Down, Left, Right
at the title screen. "Continue", "Fire", and
"1-P" options will appear.
Level select: Enable the "Extra options" code. Press Up,
Down nine times, 1 at the extra options screen.
The word "Round" and a number will appear at the bottom
of the screen. Press Left or Right to select a new
starting level, from 1 to 50. Press 1 to begin game play
at the selected level.
