PrimeDice is a simple betting game. It allows user to bet with Bitcoin and the fairness of their results on the blockchain. The house edge when rolling on Primedice is only 1% (RTP 99%).
The user enters in a bet, selects a payout or win chance and hit roll dice. After clicking roll a provably fair dice roll is generated and if the number falls within your green win region you win the bet.
A fairly simple game that allows you to bet and win. They only have dice games and it's a shame they're limited to just that. However, if you like this kind of entertainment, then why not.