As you play something in the free mode at, you can see how frequent the wins are, or the special symbols and bonus features triggered. Well, there are so many underwater-themed slots online today – nearly as many as the fish in the sea, so what makes this one special and how do you tell the difference when choosing which game to play? While this is what any player would ask, such questions became easier to answer with casino slot games for free. Dolphin Reef is one of the well-known NextGen Gaming casino games.