You can play this game on Normal or Casual. I recommend playing this on Casual because normal is way too hard. 4 Worlds to this game. What I like about this game is that you can retry the bonus levels as many times as you want, & you don't have to get all the letters in a level all at once. Collect 100 purple gems and you can also try to beat levels without getting hit. There's time trials as well. You can choose to do 5 different things in the levels. Bosses are the only thing I don't like.