If I try a challenge, I try it at the highest level. One year ago, i considered the caveman challenge - and of course, I had to do it at nanocristalline diamond level. I gave up soon, stating "too much grinding, I don't like it". Instead, I went on and did a bunch of large scale missions with kerbalism. The last one was 320-year long. Greenhouses require manual harvesting twice every year, and I had 19, so i clicked "harvest" over 12000 times. The mission also required manually servici