Draw The Hill

Draw The Hill hands you the pen instead of the steering wheel: the vehicle drives itself, and the actual gameplay is sketching the road it drives on, a smooth ramp over a gap, a gentle slope down a steep drop, drawn in real time as the vehicle approaches.

Because the vehicle follows physics rather than a scripted path, a line drawn too steep sends it airborne and tumbling, while one drawn too flat can leave it grinding to a halt on an incline it can't climb. Sketching just ahead of the vehicle rather than planning the whole level in advance tends to work better in practice, since reacting to the vehicle's actual speed and angle beats guessing at it from a standstill. Happy Wheels tests a similar sense of vehicle physics over rough terrain, minus the drawing.