To access the final ten levels, you have to collect 9 letters. To get these, kill at least 4 enemies in one Super Bubble, and collect the key icon that is dropped. Then, carry on until the boss of that zone (levels ending in 0) and kill it. Instead of dropping a giant gem, it will leave a letter. Pick up nine of these (one per boss) to ultimately finish the game.
In the Classic version, there is no apparent continuationmode. However, when you get a "Game Over" go back tothe screen where you start on level 1 and scroll down. You willsee the Bubble Bobble dinosaur go down on a elevator-type platformto stop at the last level you were at. For example, if you diedat level 14 then you can continue again at that point after the"Game Over".