Mods to make KSP more difficult?

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As the title suggests, I'm looking for mods to make the game more difficult. I've gotten fairly good at KSP, using things like B9 and texture packs (also MechJeb when I first started playing, but now I mainly use it for information or executing really precise manoeuvres), so I want a new challenge, without making it practically impossible to do anything. What do you guys suggest?

EDIT: Links to suggested mods are appreciated, but not necessary.

EDIT 2: All right, thanks to everybody for all your suggestions. I have the challenge I was looking for now.

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Rhyfeddol

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Posted: 10 years ago
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