Here are some cheats and tips for the game Bubble Bobble.
Debug Menu:
At the game-select screen, pick Bubble Bobble. Then, at the Bubble
Bobble title screen, press Down, Up, Down, Up, Right, Down, Left,
Down, Up, Down. You’ll hear a chime. Start a game and press R2 at any
time. This brings up a debug menu that lets you warp to any level and
increases your lives. Press L2 to exit the debug menu.