This game is surprisingly educational, for a racing game. you have to apply torque, yaw, and pitch, if you're building a plane, but it teaches you about those factors, and I can't reccomend it enough. I might have shown it to one of my teachers, if it wasn't $10.00. As far as I am aware of, there is no paid downloadable content (DLC) that you have to seperatley pay for. I like this better than the free 2-D game's format of "you can play it, but you can't use thrusters, wings, and angle locks. (You still can't use thrusters in sandbox, but you can use the others.)