Underwater World

(No Ratings)
Upload a screenshot and win!
Something wrong with the game? Click here to know more.
Report a problem

Best Online Casinos to Play for Real Money

King Billy Casino King Billy Casino
Welcome Pack €2500 +250 Free Spins
Skol Casino Skol Casino
up to $1300 + 250 Bonus Spins
Casino Cruise Casino Cruise
55 Free Spins + 100% up to $/£/€200 + 200 Free Spins
Vulkan Vegas Vulkan Vegas
Up to CA$/€/$1500 + 150 Free Spins Only the first and the second deposit made within 7 days after the activation of the bonus are taken into account with the offer. Max bonus amount for the first deposit is €300; for the second starting from €15 —€400, for the second starting from €50 — €700. 30x wagering requirements for free spins and 40x for bonuses. The maximum bet allowed when playing with bonus money is of $/C$/€5.

Rules and Gameplay

The Underwater World slot game features a captivating underwater theme where players navigate through a 5-reel, 15 payline setup. Gameplay begins with setting bets, where players can adjust the coin size from $0.10 to $6 by clicking on “Line Bet.” The “Spin” button activates the reels once the betting range is selected. Players seeking more automated gameplay can utilize the “Auto Spin” feature, which spins the reels without interruption for a chosen number of times. The “Max Bet” feature allows for the maximum bet to be placed instantly and the reels to be activated at this wager level.

Bonus Features

Underwater World slot is rich in bonus features, enhancing both the excitement and potential winnings for players:

  • Free Spins: Triggered by landing 3 or more Mermaid scatter symbols, rewarding players with 15 free spins and a x3 multiplier. This feature can be re-triggered an infinite number of times.
  • Double Up Gamble: After any win, players can opt to gamble their winnings by clicking the “Double Up” button. This feature involves a simple coin toss where the correct guess can double the winnings, while an incorrect guess will lead to a loss of the bet.


The game boasts a variety of thematic symbols that are both visually appealing and central to triggering game features:

  • Wild Symbol – Shark: This symbol can expand to cover reels, substituting for any symbol except the scatter, and doubles all wins when substituting in a win combination.
  • Scatter Symbol – Mermaid: Scatter wins are multiplied by the total bet and can activate the free spins bonus.


Payouts in Underwater World are particularly lucrative when high-value symbols line up on active paylines. Here’s a quick breakdown:

Symbol Combination Payout
Wild (Shark) 5 on a payline $10,000 coins
Scatter (Mermaid) 3 or more 15 free spins + x3 multiplier


The Underwater World slot offers 15 paylines, providing numerous chances to form winning combinations across the reels. Players can activate or deactivate paylines as desired to adjust their betting strategy and potential winnings. The intuitive design allows easy adjustments and real-time updates to betting configurations.

Pros & Cons

Pros Cons
Engaging underwater theme with vibrant graphics High minimum bet might deter low-stakes players
Features like Free Spins and Double Up increase win potential RTP is unknown, making it hard to gauge game fairness
Expanding Wilds and Scatter symbols enhance gameplay Could be more interactive bonus rounds

Minimum and Maximum Bet

The betting range in Underwater World is designed to accommodate various types of players. The minimum bet per line is set at $0.10, allowing for a total minimum bet of $1.50 when all paylines are active. The maximum coin size is $6, leading to a total maximum bet of $90 when playing at full capacity across all lines. This range provides flexibility for both casual players and high rollers looking to maximize their payout potential.

Game Jackpot

The jackpot in Underwater World is set at 750 coins. Additionally, for high rollers, landing 5 Wild symbols on an active payline can result in a win of 10,000 coins. The game’s RTP (Return to Player) and variance are not publicly disclosed, which might affect players’ strategy, particularly those looking for games with known high return rates or specific volatility levels. Nevertheless, the substantial top payout offers a compelling target for those chasing big wins.

About Provider

Underwater World is developed by GamePlay Interactive, a renowned provider in the online casino market known for its innovative gaming solutions and engaging slot designs. GamePlay Interactive consistently delivers high-quality graphics and interactive features that appeal to a wide range of players, ensuring an immersive gaming experience. Their reputation for reliability and engaging content makes them a popular choice among casino operators and players alike.

How To Play

  • Start by setting your bets. Adjust the coin size using the +/- buttons to set your desired wager from $0.10 to $6 per line.
  • Activate the desired number of paylines (up to 15). More active paylines increase the chances of winning combinations but also raise the total bet amount.
  • Use the ‘Spin’ button to start the game with your current bet settings.
  • For continuous gameplay, select ‘Auto Spin’ and choose the number of times you want the reels to spin without interruption.
  • If you’re aiming for the maximum possible bet, press ‘Max Bet’ to adjust your wager to the highest possible amount and spin the reels automatically at this bet level.
  • After any win, you have the option to gamble your winnings by pressing the ‘Double Up’ button. Choose heads or tails in the coin toss for a chance to double your winnings.


Underwater World is an exciting slot game that offers a visually stunning dive into a vibrant underwater realm. With its wide betting range, it caters to both beginners and seasoned players. The game’s engaging theme, combined with features like free spins, expanding wilds, and a gamble option, make it a compelling choice for anyone looking to enjoy a fun and potentially profitable online slot experience. The lack of disclosed RTP and variance is a minor setback, but the game’s overall appeal remains strong.