Algodoo

A and D to control the monowheel. There is no `bar` coming out of the top like a segway, because the vehicle is designed for the rider to sit inside, not stand on top. The vehicle could be called self balancing because the insides are fairly stable, and if you attached a bar to it, I`m sure it would function the same as a segway. Note this also includes a track edit, which is merely a suggestion.