jmz and Eftyen — please do not attempt to clarify the rules for individuals. That's my job. And if everyone is throwing in their two cents, then wrong information is bound to be given. The thing is — did Tyler come back and ask for more clarification? No. So, either Tyler hasn't logged on in a while or he read my explanation of what "one shot" means and understood. Whatever the case, your posts were completely unnecessary in this situation. And unfortunately, as Pam pointed out, it would appear that misleading information was given where Eftyen states "Once you officially start the challenge, you cannot abandon the game and create fresh Sims at any time..."
Now, I'm quite certain, Eftyen, you didn't actually mean that the way that Pam and others may interpret it — once someone begins a challenge, you cannot create Sims. Period. You simply were saying once you begin a challenge, you're committed to that one file and can't abandon it and create another one "for the challenge." I got that. But, see the problem here? I'm having to interpret your interpretation of my explanation!

Too much. Definitely, too much. It's not necessary. I appreciate you guys stepping in and offering your feedback, but please just leave it to me in the future.
If for some reason I'm not online for an extended period of time (like a couple days) and someone really needs something explained, then my role falls to Pam.
Thanks everyone.