I've just gotten started in KSP (loving it!!), and I'm no rocket surgeon so I've opted to keep it simple and fun in career mode. The few "rules" I've made to guide my gaming experience are not to intentionally launch any manned one-way or suicide missions (at this point to the Mun or Minmus), and to rescue any Kerbals if I can't return to the homeworld on the first go. No cheating as well, although at my current level of experience, I could see me using a specific cheat CSB time: My first time actually reaching the Mun (as I was learning how orbits work), I couldn't resist attempting to land on it with the tall booster/capsule craft I had left. It had plenty of fuel somehow (there was no delta-v or math involved at this point, still aren't), so I managed to brake enough to gently land it on its side on a mountain... without landing gear or any design considerations. I still ecstatic I had made it to the Mun and my little craft and Kerbal survived! I then discovered I couldn't take off without explodiating all over the munscape, so that's where I decided I needed to built a rescue craft and learn how to get it there. This game has such wonderful little moments, especially if you craft your own "restrictions" along the way! This thread has a bunch of great ideas to increase the challenge (assuming I'll ever need to), as well as cool mod ideas to search for. Thanks all! /still need to figure out this whole delta-v/T2W ratio stuff //in memory of all those kerbals who dared to reach space, but died in fire and frustration, or possibly a warp core breach