We have all seen chat blow up with players claiming they cant be beat or thier better then another player why not let them play each other. Introduce a challenge feature you can even make a special coin for it give 5 free a day and a refill option for coinage. This will give another key feature to the game cut down on players bickering in chat and allow you to make a little extra $ off those players who want to spam challenges limiting the amount they can send without having to pay some coinage