Hmmm...this sounds pretty cool. :>

I have an idea for what happens if you win a "modified" game, though...

If you win something that's been corrupted, say, by the Underground, the prize you receive will always have a positive effect for you...but it's been corrupted as well, and it might not be so nice for the other people it affects. For example, a Red ring might induce unwanted lust or general horniness in other people, or a Silver ring makes your charisma dangerously powerful: if you give a command during its effect, the recipient is compelled to obey.

I like moral dilemmas.