make around the world challenge with cessna 152 with no auto pilot, no speeding up the game, clock allways runs even if you are not at pc. then it should be checked if it is even possible since cessna 152 has quite limited range, (since getting back from america to europe might be a bit of a bother. Fuel cannot be unlimited, all the damages should be enabled, and so on so it is hard, if crash then you go back to the last airport you landed etc, this might be a fun endurance run.