Bubble Bobble

Note: This is the classic Game Boy game, not to be confused with Bubble Bobble for the Game Boy Color.

Level select:
Enter KGBJ as a password. Press Left to select a level.

Hidden level:
Enter KZ5K as a password.

Information in this section was contributed by Bcj153.

Level 25
Jump up to the middle of the room before the Boss starts to move and get the power-up to breath fire. The easiest way to defeat him is to stand on the highest platform and shoot him on his highest jumps. Dodge when he tries to jump underneath your character.

Level 50
As before, collect the power-up before the Boss starts to move. Learn his movement patterns and attacks before trying to shoot him.

Level 75
Again, quickly get the power-up. Stay on the level that hangs approximately where his head is when he jumps. Shoot at him when his head is at your character's level. Watch out for the fireballs he throws; although once their pattern is learned, they are easy to dodge.

Level 100
The final boss. The power-up in this level works slightly differently than in previous levels. Your character gains the ability to shoot lightning bubbles which need to be popped in order to be effective. Climb up the platforms while the Boss has his back turned. Then, jump towards the wall and press the Attack as fast as possible. As your character moves down the wall, a steady stream of lightning bolts will be fired at the Boss. These bolts will also destroy the projectiles he throws. Do not linger in the corners too long. As with the previous bosses, defeating the final Boss becomes easier once his patterns are learned. After defeating the final Boss, a password which will restarts the game at level 1 with harder enemies will be revealed. The bosses will need more hits to defeat at this new difficulty setting, but their patterns remain the same.
Information in this section was contributed by Jesse Smith.

Hint: Extra points:
Stand facing the wall. Get directly next to it, then shoot bubbles. They will automatically pop, giving you 10 points per bubble. You can get very high points with this trick.
Information in this section was contributed by Bcj153.