At first it looks promising, and it is a lot of fun and challenging, until you realize that you'll never get anywhere. As you try to advance to the higher levels, you have to first get through a series of sub levels. Sounds normal for most games right? The catch here is that if you're, for instance, at level 6-1, and you advance all the way to 6-5, you might slip up and make a mistake on level 6-5. Now, instead of the game starting you over on THAT level, which seems fair, it takes you all the way back to level 6-1! Which means the effort you put in level 6-1, 6-2, 6-3, and 6-4, means nothing! I've never played a game that rewards you so little like this. It's kind of pointless to even put forth the effort to play.