The Rainbow Bubble creates a match between all of the bubbles it touches.

The Fireball goes through first eight objects it comes in contact with, even stone blockers. 

The Crusher destroys all bubbles or blockers of a single kind from the screen.

The Mighty Eagle Eye differs from all the other boosters. It makes the aiming line longer and also shows exactly where your bubble is going to land. This makes aiming so much easier!