Independence Day Break (UP)

You can get a maximum of 3 stars on every level, making 90 stars in total. To get 3 stars on a level it needs to be beaten quick and without losing to many lives. The easiest way is to reset the level in order to get an early fireball or laser power up, then quickly clearing the level. Of course since you only need 7 out of 90 stars you don't need to try for 3 stars if you don't want to and simply play a few extra levels.