I was going to give 4 stars to the first 6 worlds of the game, but it became very boring when they asked me to collect an extra 40 stars to reach the bosses at the end of the 7th and 8th worlds. I had to play all these levels over and over again and collect the stars in them. The level designs are good but it feels good once you play it. It gets boring when you play the same level 5 times. I collected these stars to unlock the boss at the end of the 7th world, but when I reached the end of the 8th world, it asked me for 20 more and I closed it there, and the bosses at the end are not good at all.