It's a very basic idea but makes for a very addictive game. If you hit a bubble with the correct color you also take out any connected bubbles of the same color. So it's possible to take out a lot of bubbles at once with a bit of planning.
PB has been really fun. Played in the team model has been w / my daughter. We went to the 5 and 'won' some type of code. Do not know how to do it? Any ideas?