Kerbal Space Programmer

This is a pretty fun one. I really enjoy Squad's Kerbal Space Program, a space exploration/ridiculous vehicle simulator. While you fly the vehicles yourself, a lot of the heavy lifting in terms of flight control is done by the stock game, and even more by the amazingly sophisticated MechJeb automation mod. But I think it'd be pretty fun to turn that idea on its head.

What if, instead of having to build and fly a spaceship, you had to write a control system for a spaceship that was already built, and would be flown by a simulated pilot? You'd get all the control inputs in, sensor readings, etc, and have to write code to turn that into stable flying. The early levels would be simpler things like pilotless control of a single gimballed engine, but you'd eventually build up to pilot-assisted autopilot of complex multiple-control-surface vehicles. Maybe you'd even have to deal with incorrect sensors or hardware faults.

If it was done right, it could be basically the Kerbal Space Program of control theory, and who wouldn't want that?