I saw that in interface exist a place for a ETH and BTC balance, so you planning allow play games using another currencies or it will be automatically converted?
Transactions in BTC happens very long, so automatically conversion just can't work, try to imagine you have BTC but haven't FUNDZ, you trying to participate in contest and you should wait 12 hours before you will be able to participate, it's horrible. I think contests should reqire a FUNDZ, if there will be exchange it would be nice, but not automaticall.