Well, I don't have a riddle up yet (obviously), and I'm considering start over.
What I mean by starting over:
I think what I might do is create sets of 25 riddles and each person will need to provide a different answer to continue (which would prevent spoilers ;). I'll have more on this later. But I'll probably not post a new riddle for a day or so, if I do. Sorry.
I'll keep you guys up to date.