Hey guys, My first post on this forum. I have been playing KSP since 0.23 and have had most fun with the BTSM. I Just found out this thread when I was searching for more information about how to make manned&landed Duna mission in BTSM. I have finished twice the normal mode ie. unlocked all nodes in Tier 8 (second-to-last) and I'm again stuck at the Tier 8. The only science left is manned missions outside Kerbin SOI. I have done all the missions as a "single launch mission" which I mean; no duplicate launches, assisting launches or orbital bases. So, do you guys know if it's possible to make manned&landed Duna mission in a single launch in Tier 8? I have been trying to succeed with this for too long. If I will start BTSM third time then I will definitely try this challenge. btw, do you happen to know any other great gameplay mods like BTSM? Death Engineer, I have been enjoying your challenge diary. It looks like you rarely use boosters for staging. Is there a reason for it?