3. Beat the clock for a better score

It's relatively easy to get all three stars in each level, but it isn't easy to get top scores. This goes back to tip #1 in which there's normally more than one way to complete a level. Naturally some of those ways are much faster than others. Your score is directly related to not only how many stars you get (you only need one in order to clear the level and move one), but how fast you manage to do it. If you want top rankings in Game Center, you'll need to replay some levels in order to complete levels faster.