One of the most frustrating "games" I've ever played. When a goal is missed (i.e., jumping from one fan blade to another inside the vacuum), the player must start back at the beginning of the challenge, not where he left off. Once one skill is mastered, you have to go too far back to address the next challenge. It'd be as if you didn't do well in your Junior-Year in college, and the system forced you to go all the way back to primary school. I quit the game and wouldn't recommend it to anyone that enjoys progressive movement in video games or in life. I'm done.