If you search the GamBonus website, you will discover that we have a webpage dedicated to Fish-themed slots. However, with 2 thirds of our planet covered in water, there is so much of interest lying beneath the surface of our oceans, so on this webpage, we cast our nets wider and talk about some of the other Underwater slots you can try.
1) Aquatic Adventurer by KA Gaming
Screenshot of Aquatic Adventurer by KA Gaming courtesy of bspin casino
This online casino underwater slot from KA Gaming follows the fortunes of an underwater diver who descends to the ocean floor in search of treasure. You get to enjoy sights of some beautiful ocean-dwelling creatures and corals as the intrepid Diver seeks out a treasure map and the riches it may contain.
Most underwater slot games offer some great features, and Aquatic Adventurer is no exception. There are free spins (triggered by the Treasure Map Scatter), expanding wilds, and increasing multipliers. The well-crafted symbols of this 5×3 slot include playing card values 10 to Ace, Corals, Fish, Octopus, Stingrays and Turtles. The values of these symbols are shown in the table below.
| Symbols | 3 of a Kind | 4 of a Kind | 5 of a Kind |
| 10 | $0.01 | $0.02 | $0.03 |
| J | $0.02 | $0.04 | $0.06 |
| Q | $0.02 | $0.04 | $0.06 |
| K | $0.03 | $0.06 | $0.09 |
| A | $0.03 | $0.06 | $0.09 |
| Coral | $0.04 | $0.08 | $0.12 |
| Clown Fish | $0.04 | $0.08 | $0.12 |
| Puffer Fish | $0.05 | $0.10 | $0.15 |
| Turtle | $0.06 | $0.12 | $0.18 |
| Octopus | $0.08 | $0.16 | $0.24 |
| Stingray | $0.10 | $0.20 | $0.30 |
| Scatter (Treasure Map) | $0.40 | $2.00 | $10.00 |
As you can see in the above table, the Scatter in this casino underwater slot is a Treasure Map. Landing 3, 4, or 5 wins you 10, 30, or 30 Free Spins, respectively.
The Wild (which only lands on the 2nd, 3rd, and 4th reels) is the Deep Sea Diver, which can substitute for all other symbols except the Treasure Map Scatter.
The Free Spins Feature
The prime feature is the Free Spins round. Triggered by landing 3 or more Scatters. The round is introduced with the image of a sunken porthole and rising bubbles. Click anywhere to start the round.
Expanding Wilds
When the Wild lands, if it lands in rows 1, 2, or 3, it will drop down to the 4th row. Each time it drops, the multiplier increases by 1. The max is a 4x multiplier.
GamBonus’s Final Thoughts on the Aquatic Adventurer Slot
Aquatic Adventurer is one of the underwater slot games that comes with a medium to high volatility rating. Small payouts happen regularly, but you’ll have to wait a bit longer for more significant prizes. We measured the average hit frequency at 29.54%. But if you keep at it, you could win up to 5,415x your stake. It’s certainly worth a play.
2) Atlantis Megaways by ReelPlay
Screenshot of Atlantis Megaways by ReelPlay courtesy of Bitstarz Casino
The legend of the sunken city of Atlantis has captivated the imaginations of millions over centuries. The myth originates from two of Plato’s dialogues, “Timaeus” and “Critias,” which were written circa 360 BC. He refers to Atlantis as a powerful and advanced civilisation that existed approximately 9,000 years before his time. The Atlantis Megaways slot by ReelPlay is one of the rare Atlantis-themed underwater slot games that is driven by Megaways technology, offering 117,649 ways to win.
With 6 reels (plus a 7th, horizontal reel) and a variable number of rows, anywhere from 2 to 7, every winning combo you land triggers a reaction. The symbols include playing card values 10, J, Q, K, and A, a Lionfish, a Seahorse, a Giant Squid, a Dolphin, and King Atlas (son of Poseidon), whose name formed the basis of the name of the mighty city itself. Symbol worths are shown below.
| Symbols | 2 of a Kind | 3 of a Kind | 4 of a Kind | 5 of a Kind | 6 of a Kind |
| 10 | 0.1 | 0.2 | 0.4 | 0.5 | |
| J | 0.1 | 0.25 | 0.4 | 0.6 | |
| Q | 0.15 | 0.25 | 0.50 | 0.70 | |
| K | 0.15 | 0.30 | 0.50 | 0.90 | |
| A | 0.15 | 0.30 | 0.60 | 1.00 | |
| Lionfish | 0.20 | 0.30 | 0.60 | 1.20 | |
| Seahorse | 0.25 | 0.50 | 1.00 | 2.00 | |
| Giant Squid | 0.25 | 0.75 | 1.50 | 2.50 | |
| Dolphin | 0.50 | 1.50 | 2.50 | 5.00 | |
| King Atlas | 2.00 | 5.00 | 10.00 | 30.00 | 100 |
The Scatter is a Chest of Gold. Land 6 and you trigger the Bonus Respins. The Wild is a Colosseum-type structure set on a tiered platform on the ocean floor. It appears only on the horizontal reel and substitutes for all symbols barring the Scatter.
Features of Atlantis Megaways
The Atlantis Megaways casino underwater slot has a couple of excellent features, namely Bonus Respins and Pearl Bonuses that appear in the Bonus Respins round.
The Respins commence after you land 6 Scatters. The Respins are awarded. The Scatters are sticky and remain in place throughout the round. Any new ones that appear are sticky and trigger 3 additional respins. Bonus Respins continue until either no more remain or all spots on the reels are filled with Treasure Chests. Each chest opens to display its instant cash prize, which can amount to up to 100x your wager or 1 of 4 jackpots – Mini (10x), Minor (50x), Grand (250x), and Major (2,000x).
Like some other underwater slot games, Atlantis Megaways has a cascading reel feature in standard gameplay mode, which increases the win potential. The winning symbols cascade down (or across if the symbol is in the horizontal bar) and are replaced with new ones, which provides another opportunity for wins.
GamBonus’s Final Thoughts on the Atlantis Megaways Slot
The soundtrack of this casino underwater slot is imperious, befitting the legendary sunken city. It’s a little annoying at times when it reaches a crescendo, but nothing happens. However, that’s a minor fault. Overall, Atlantic Megaways is a very playable slot and holds your attention. With an above-average RTP of 96.1% and a medium to high variance rating, there’s always something going on, and you’ll land regular, smallish wins. The maximum you can win is €216,025, which is where the high variance comes into play.
3) Pearl Diver 2L Treasure Chest by 3 Oaks
Screenshot of Pearl Diver 2: Treasure Chest by 3 Oaks courtesy of Mirax Casino
A classic 5×3, 10 fixed payline slot from 3 Oaks (Booongo), Pearl Diver 2: Treasure Chest is perhaps the most clean-cut looking of all underwater slot games. The understated soundtrack, with its Steel Drum melody, transports you effortlessly to the Caribbean, where the scuba driver character is off in search of pearls. If you’re craving a straightforward, easy-to-play slot, this is the game for you.
The design of the symbols follows the same simplicity theme. They are stark yet colourful creations and serve their purpose well. They include the ever-popular 10 to Ace Playing Card values, a Smiley Dolphin, a Smiley Turtle, a Flipper, a Diver’s Mask, and the Diver himself – guess what? – Yes, smiling. The symbols are worth:
| Symbols | 3 of a Kind | 4 of a Kind | 5 of a Kind |
| 10 or J or Q | 1.25 | 6.25 | 18.75 |
| K or A | 1.25 | 7.50 | 25.00 |
| Mask | 5.00 | 25.00 | 125.00 |
| Flippers | 5.00 | 25.00 | 125.00 |
| Turtle | 7.50 | 37.50 | 250.00 |
| Dolphin | 12.50 | 50.00 | 500.00 |
| Diver (Wild/Scatter) | 2.50 | 25.00 | 250.00 |
The Diver (without the mask) in this casino underwater slot game is the special symbol that doubles as both the Wild and the Scatter. As a Wild, it replaces all other symbols and helps in making winning combinations. It also pays as per the paytable above. As the Scatter, it triggers the free spins, granting you 5, 10, 15, or 20. Also, if you land 3, 4, or 5, it pays 1x, 10x, or 100x your wager.
Other symbols that appear in the basic game are the Pearls. There are 4 of them and they are coloured Purple, Blue, Green, and Red, but they have no value. However, that changes in the Free Spins round.
Free Spins
Features a diver with a pearl who is wearing his mask. There are 2 symbols which only appear when the Free Spins round is in progress. One is a different version of the Diver, but in this instance, he’s underwater, wearing his mask and holding an open Oyster containing a Gleaming Pearl.
The other new symbols are also versions of ones that appear in the base game; this time it’s the 4, different coloured, open Oyster Shells, each containing a pearl and each triggering more free spins – Purple = 2 FS, Blue = 5 FS, Green = 10 FS, and Red = 15 FS. They also act as multipliers.
The Diver Feature
When triggered, the Diver dons his mask and dives down to the sea bed to commence searching for oysters. During this feature, all of the Pearl and Treasure Chest wins get accumulated.
The Gold Pearl Feature
During this feature, meters appear above each reel. Every time a gold pearl lands on the matching reel, it fills the meter. When the meter’s full, the diver guarantee ensures that the diver symbol appears on the reel, and you’re awarded additional free spins.
The Diver Guarantee Feature
When the Gold Pearl Progress Bar is completely full, you get an extra Free Spin.
The Treasure Chest Feature
Treasure chest symbols potentially offer 4 jackpots: Mini (worth 20x), Minor (50x), Major (100x), and Grand (1,000x). The bet range is 0.10 (min) to 30.00 (max)/
GamBonus’s Final Thoughts on the Pearl Driver 2: Treasure Chest Slot
The gameplay in the base game version is okay, but nothing special. Its 95.65% RTP and medium volatility rating translate into a mixture of small and medium-sized wins. If you persevere and qualify for the Free Spins round, that’s when this casino underwater slot gets exciting and interesting, making it one of the best underwater slot games to play.
4) Lord of the Ocean by Novomatic
Screenshot of Lord of the Ocean by Novomatic courtesy of Metaspins Casino
Lord of the Ocean by Novomatic is one of the best underwater themed slots that is based on the Greek, Olympian God of the Sea, Poseidon. He is also one of the thorniest, bad-tempered Gods with traits of moodiness and greed, so player, beware. As well as being the god of the Sea, he is also the god of earthquakes, horses, and storms.
Like the majority of underwater slot games, the Lord of the Ocean slot from Novomatic is a 5×3 grid game. Originally, it was launched as a land-based casino game, and its symbol design and blips and beeps soundtrack are the same in the online casino version. But it’s still a popular game, especially among players who like a touch of nostalgia. The opening sequence, with its video images of the Portal to the underwater kingdom opening, the Mermaid, the Warrior Statue, and Poseidon himself, followed by the Portal to the kingdom closing, is impressive.
In line with Novomatic’s usual format, Lord of the Ocean is not a feature-rich slot. It features a combined Wild/Scatter symbol that can trigger the lone feature – the Free Spins round. The symbols of the casino underwater slot include: Card Values 10 through to Ace, the Warrior Statue, a Treasure Chest, a Mermaid, and Poseidon, plus the Portal Scatter. The values of the symbols are as per the paytable below.
Lord of the Ocean Paytable
| Symbols | 2 of a Kind | 3 of a Kind | 4 of a Kind | 5 of a Kind |
| 10, or J, or Q | 0.50 | 2.50 | 10.00 | |
| K or A | 0.50 | 4.00 | 15.00 | |
| Warrior Statue | 0.50 | 3.00 | 10.00 | 75.00 |
| Treasure Chest | 0.50 | 3.00 | 10.00 | 75.00 |
| Mermaid | 0.50 | 4.00 | 50.00 | 200.00 |
| Poseidon | 1.00 | 10.00 | 100.00 | 500.00 |
| Portal Scatter | 2.00 | 20.00 | 200.00 |
The Portal Wild/Scatter is a busy symbol as it also welcomes you to the Free Spins round.
The Free Spins Feature
Land 3 Portals in one spin, and you trigger the Free Spins game. The graphics come to life, and the Portal to the kingdom opens, welcoming you in. The grid is covered with an expanding symbol, which gives way to reveal the landed symbols. This happens 10 times, and prizes are accumulated and paid out when the feature ends.
Normal gameplay then resumes.
GamBonus’s Final Thoughts on the Lord of the Ocean Slot
It’s back to basics with this casino underwater slot, but that’s fine for those who like their games more traditional, with its simple 5×3, 10 payline slot gameplay. The RTP is a bit on the low side, set at 95.01%, added to which this is a high volatility game. But with a bet range from 0.10 to 100 coins and a top payout of 5,000x your stake, it’s one of the potentially best prize underwater slot games.
5) Mermaids by NetEnt
Screenshot of Mermaids by NetEnt courtesy of Metaspins Casino
Dive beneath the surface of the ocean and meet 4 gorgeous mermaids. Mermaids by NetEnt is one of several underwater themed slots that centre their games on these mythical creatures. In this slot, your task is to relieve the beautiful sea lovelies of some of the ancient treasure they guard.
Mermaids is a classic 5×3, 20 payline, feature-rich slot. The symbols comprise card symbols 10, J, Q, K, and A, plus 4 beautiful Mermaids, one Golden Blond, one Redhead, one Lilac Blond, and one Platinum Blond. 9 symbols may not sound like a lot in comparison to other underwater slot games, but it’s plenty enough to deliver an engaging experience. The symbol payout values are:
| Symbols | 2 of a Kind | 3 of a Kind | 4 of a Kind | 5 of a Kind |
| 10 | €0.20 | €1.00 | €6.00 | |
| J | €0.40 | €2.00 | €10.00 | |
| Q | €0.60 | €3.00 | €20.00 | |
| K | €0.80 | €4.00 | €30.00 | |
| A | €1.20 | €6.00 | €40.00 | |
| Platinum Mermaid | €2.00 | €10.00 | €60.00 | |
| Lilac Mermaid | €3.00 | €14.00 | €80.00 | |
| Redhead Mermaid | €0.40 | €4.00 | €20.00 | €120.00 |
| Golden Mermaid | €1.00 | €5.00 | €40.00 | €200.00 |
The Wilds are Mermaids Rings. There are 4. One is a plain Wild, then there are 3 Progress Wilds, one Jade, one Amethyst, and one Pearl. All 4 act as Wilds, but the 3 Progress Wilds, also contribute to one of 3 corresponding Wild Progress collectors above the grid.
Mermaids Slot Features
This is one of the underwater slot games where the creator (NetEnt) excelled themselves by introducing a totally new type of feature – the Picker Bonus.
The Picker Bonus
In this casino underwater slot, the unique Picker Bonus is triggered when the Lilac Progress Globe Collector is filled. The Lilac collector tops out at 15, the Jade at 30, and the Pearl at 50. When you start the base game, each Collector is credited with 5 Progress Globes. When the collector limit has been reached, other features are triggered. A full Jade Globe Collector triggers the Picker Bonus.
In the Picker Bonus feature, you get to blind choose 3 different Shell Shapes. The prizes they represent are random and hidden. Depending on your choice, prizes can be 2x to 50x your wager, Wild Spins, or Mermaid Spins.
The Wild Spins Feature
Most underwater themed slots have Wilds. Mermaids has a Wild Spins feature. When it begins, you’ll have 10 Green Progress Globes in the Collector. Once you accumulate 30, Random Wilds can land. They award 2 to 6 Regular Wilds to the reels.
The Mermaid Spins Feature
When the Mermaid Spins feature begins, you’ll have 10 Green Progress Globes in the Collector. Once you accumulate 60, you’ll be awarded 10 Free Spins, which include Random Wilds. As with the Wild Spins feature, they award 2 to 6 Regular Wilds to the reels.
GamBonus’s Final Thoughts on The Mermaids Slot
If you’re into underwater slot games that are feature-rich, you’ll enjoy playing NetEnt’s Mermaids slot. The RTP is 96.09% and it’s a high volatility game, so you’ll need to work at it to unlock the bonus features, but the team here at GamBonus found it both rewarding and enjoyable.
