Nereid to Triton
Extract this scenario into your orbiter folder. It will place a scenario called Nereid_to_Triton.scn in your Orbiter scenarios folder. Run this scenario with limited fuel. The object is to manoevre the Deltaglider to a safe landing anywhere on Triton within 7 months of the date the scenario starts.
This challenge involves basic understanding of plane changes and setting up transfers. It is surprisingly tough for the simplicity it has. The deltaV supplied is about 4500 m/s. It can be done with as little as 3500 m/s but anything less than 4000 requires some amount of trial and error to refine the method.
Good luck.