Can we build something similar to the stratolauncher that jettisons it's landing pylons (which has fuel that is burned off initially to carry a spaceplane to high altitude that then heads to another planet's orbit.
Easy: Get the spaceplane to CisMunar orbit and return after landing and then dropping something (10 tons) there. Harder version of easy is to also carry 60 Kerbals.
Medium: Same as Easy but on Dun. Harder version is dropping 50 tons.
Hard: Launch to Duna, land, drop 25 kerbals, land on Ike, drop 10-40 tons as well as 30 kerbals. Make a refueling stop at Ike, burn towards Mun, land, jettison 15 tons and then reenter kerbin orbit without assistance.