I got it when it was the featured free app, but if you're considering buying it, you don't have to worry about the amount of content not being worth the money as there are a lot of levels (there are five stages, each stage has ten runs, each run has five different levels within it, and there are two bonus games you can unlock with each stage). And it's definitely not easy, so prepare to die over and over. You must get through the five levels within each run without dying, or you have to start the run all over again, which makes it both thrilling and frustrating. Sometimes you have to move super fast, or new obstacles are introduced without explanation, which also requires dying and learning from your mistakes. If a run is difficult, you just have to play it over and over and you'll eventually get better at it. I had some problems with the character not moving in the direction I swiped, but that was only a few of the levels. It can be hard on the levels where it's zoomed out and hard to see the character. I love the variety of color designs for the runs, the replay video feature (which is very helpful in figuring out a level, or just to review your awesome skills), and the bonus level you get from collecting all the gameboys (wish they were easier to unlock!).