So, this is the first time I've ever posted, so this *may* not be a terribly good post. I'm also a relatively new KSP player, so I didn't do any of the harder challenges, nor know whether or not they are possible.
As the title suggests, this challenge is about having no heads-up-display. F2 I believe is the default key.
Rules: no cheats, visual mods are fine, info mods are fine (e.g. Kerbal Engineer Redux), I'm not sure whether in-flight assistants (MechJeb) work with no HUD. Stock Parts only. Anything that alters stuff in flight (FAR) preferably no.
Build your craft. Action groups are probably important with the lack of HUD. Before liftoff, you can do whatever (turn on SAS, transfer crew, fly a plane into your craft, i dunno) but when you start liftoff, there must be no HUD. The only time you can get your HUD back is when you've completed the mission.
Going into map mode is allowed. Map mode probably will provide you with valuable information about your periapsis, apoapsis, altitude and velocity.
[i don't think I'm missing anything, am I?]
Really, seriously too easy: Get into space.
Very easy: Get into orbit (PE>70 km)
Easy: Get into orbit, and come back and land (and survive the landing).
Medium: Get into either a mun or minmus intercept
Hard: Land on either the mun or minmus, then come home
Very hard: Land on Duna, then come home
No, this is not possible: Do a flyby of the mun, then land on Laythe, then get into low Eve orbit, send another craft (also without HUD) to dock with this craft, escape Eve, get into kerbin orbit, land on the mun, then come home. Jump out of the spacecraft before it reaches 1km altitude when coming back, and use the jetpack to survive (i recently found out that it is possible to land a kerbal like that). Land within 50 km of the KSC.
There's no ranking, do the challenge just for the fun of it.
Edit: Here's my screenshots of the easy challenge, with an extremely overkill craft. There's not a lot of screenshots, though.
http://imgur.com/a/MJ1BJ
2nd Edit: Someone notified me that there is a navball in the IVA. My intention was to have a lack of information, so no IVA please.