Definitely agree with amber here. Just wait until the star shows and click it. If you use this strategy when there is only one firework up, you are pretty much guaranteed an Awesome or Flawless. When there are two or more Fireworks up, click the one that came up first. In a few rounds, such as Stage 1 Round 2, pairs of Fireworks come up at the same time. Be wary that you don't need to get Flawless on both of them. I usually get a Good or Awesome and a Flawless on the two Firework splits. Make sure you don't miss a Firework or two when it comes to big groups, because players tend to try and fix the error and instead end up with Oops or Ok because they went off the pattern. Using the strategies that Amber and I gave you, I am sure that you will get that Blizzard Beach room.