Casual Pixels

Great suggestions! Thanks to all who have replied so far, and keep them coming if you have them! The Mun certainly sounds like a good start. As many have said, I suppose the only thing I should expect is to be surprised! (Also, the scientifically-minded, mathematical 15-year-old in this case happens to be a "she" :-) Now, let's see if I can keep up with her...

I have a bright 15 year old that I'm planning on turning loose on KSP. Tendency to think scientifically, very good mathematical mind, etc. so I'm hoping that there will be a natural affinity for this. Is there someone out there who has been interacting with a 15-year-old and who use that experience to recommend a list of challenges appropriate to that particular age? Thanks!