Ocean themed online slot games are very popular at online casinos. Among these ocean themed slot machines there are many which feature the dolphin. In fact there are so many dolphin themed slot games that they can be considered a separate thematic category. This article reviews dolphin themed slot games from some of the leading software providers.

Cryptologic is one of the oldest online casino software providers and it offers a slot machine titled Dolphin King in its portfolio. As can be expected, the dolphin is the wild symbol and because it is king it carries a scepter and crown. It also offers the highest line payout of 5,000 coins. When the dolphin appears simultaneously on reels 1 and 5 the player is awarded 20 free spins at doubled payouts. The other thematic symbols include pearl, fish and different shells. Dolphin King is a Cryptologic Rapid Fire online slot game. It offers a progressive jackpot that can be randomly hit after any spin. It hits for small payouts but hits frequently.

Dolphin Reef is a slot game from the software provider Playtech. It is visually very similar to Dolphin King, with the dolphin being the wild symbol. The free spins feature is activated when the dolphin symbol appears at the same time on reels 2 and 4. The symbol expands to cover both the reels and remains fixed during the free spins. The remaining three reels are re-spun five times. Dolphin Reef also has the Playtech gamble game. After each payout players have the option to stake the payout in the hope of multiplying it.

Dolphin Cash is a later release by Playtech and this is apparent from the better quality of the graphics. The background to the reels display fish swimming and the ocean water moving about. Dolphin Cash is also richer in features. The Shifting Wilds feature is very exciting. The dolphin wild symbol first appears on reel 5. During the next spin it will move one reel to the left. This ensures wild symbols for five consecutive spins. Another feature in Dolphin Cash is the Playtech XtraWin feature. If players add 50% to their bet, then the wild symbol will split into two when it appears on the fifth reel. Thereafter both wild symbols will move to the left according to the Shifting Wilds features.

Dolphin Coast from Microgaming is a unique slot game that offers 3125 ways to win. It has five rows of symbols across the reels and no restriction of paylines. The features in Dolphin Coast include free spins, a bonus game on the reels and the Microgaming gamble game. For online casino players who take slots themes seriously, Dolphin Tale also from Microgaming is an excellent slot game and it is considerably different from the other dolphin themed slot games. It creates a community under the ocean using caricature symbols. The dolphin is a rookie policeman, but is the wild symbol. The walrus is the police chief. The turtle is a veteran police officer. The fish is an alluring policewoman. The shrimp is appropriately a snitch. The high value card symbols have also been replaced by thematic ones. These include casino, bank, police station, hotel and salon.

The Cryptologic dolphin themed slot game can be played at InterCasino. The Playtech ones are live at online casinos like Paddy Power and Bet365. The recommended Microgaming online casinos are All Slots and Platinum Play.