Play and Win Cash Games - Any Experience?

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There have been a few sites out there that are offering casual games (like bejeweled) where you can compete in tournaments for cash and prizes. I have been going to http://www.skilladdiction.com and competing in their tournaments (Sworbs is like bejeweled) and even won 2 gift cards through their token system. Has anyone played their before? I am looking for some challenges. Also, they have this Treasure Hunt feature where there is some larger prizes hidden, wondering if anyone has some tips on that because I am having trouble finding them.