I believe that you are mixing up things badly.
Bitcoin is money. Just imagine it as another country's currency, to keep it simple for yourself.
There are plenty of online casinos popping up over the world. Some use Bitcoin, some use VISA. No big deal.
Now, I'm not sure what you mean by "next roll game prediction" and I'm not sure if that's related to Bitcoin. Some casinos rely on (more or less) random numbers for their picks, some casinos may rely on something related to Bitcoin's blockchain (next block hash) but that's so seldom I don't think it's what you mean.
All in all, please ask more exactly what you wan to know.
seems that the OP is really new to crypto. some people are really finding it hard at first, they don't know where to begin. but if the OP is still confused, he needs to go the
beginners & help section here and learn how to transact with bitcoin or other alts. before trying to play in any of the gambling casinos here. because he may lose money for some stupid reasons.
now, his other question of this next roll game prediction, he needs to elaborate more what he means here. is it the game he is referring to? the dice or something? no one can help you if you are not clear with your question here.