Does anyone here still plays in Nitrogen Sports? Did you ever tried depositing in their site?
I have a balance in there, but they require me to deposit 0.005BTC first before I can withdraw the balance (which I won from their NitroSpread contest promotion).
I am not sure about the authenticity of the nitrogen sports site because i have not played and deposit there recently. However, there are some sites which require you to deposit certain amount first because you withdraw the money which you won from a promotion. This could also be a trap to collect money from people and do not let them withdraw. Its better to see the feedback of other users who deposit there, before taking any action on this.