Here are some cheats and tips for the game Space Ace.
Level Select:
To choose your starting level, start a game and lose all your lives.
When the CONTINUE screen appears, hold LEFT until the cursor moves to
the upper left, then press Button 2 four times. Now hold RIGHT until
the cursor moves to the right side of the screen and press Button 2
three times. Finally, hold LEFT until the cursor returns to the
left-hand side and press Button 1 once.