Why is it that none of your refund transactions are getting confirmed.
Also you have mentioned in your game criteria that one address should be used only once...that makes me wonder you already had planned that way so that double spend transactions couldn't take place.
This looks something fishy

Of course it's fishy why would he just give awan 4 btc? Why would anyone think a bitcoin doubler would result in anything but lost money?
Why would you see a guy with -64 trust for running a bitcoin doubler that said it would send a transaction (not coins) that ended up being invalid and then expect something different this time?