Bubble Bobble Cheats

If you die in a two-player game, hit Start to pause the game, then hit Select to steal a life from your partner.

To gain access to a secret room worth 400,000 points, survive 20 rounds with your first dinosaur.

Take the Crystal (found in Room 99) to Room A0. At the final boss (Room B3), fire at him until he is encased in a bubble. Now, instead of popping it right away, first hit Start to summon Player 2 (you must have at least one life left). Now pop the bubble for the ''good'' ending.

During gameplay, pause the game and press Select to activate the 2nd Player.