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Dolphin Reef is a well-known NextGen Gaming casino game. 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. As you play something in the free mode at TopFreeSlots.com, you can see how frequent the wins are, or the special symbols and bonus features triggered. No registration, downloading or risking money. This helps you to decide whether a certain game is worth playing for real, or you'd better move on to other free slots for fun with bonus games and exciting themes. As for the reason why this 5-reel, 20-payline slot is popular, it may sound simple: wilds that can expand and substitute for all symbols, including the Scatter.