Released: 1 Feb 2009

Ready for a deep sea reel adventure? Well, if you like friendly killer whales, then the Great Blue slot by Playtech may just be the one for you. Offering players the chance to win up to 10,000x their stake seems inviting enough, but let’s see what else lurks beneath the surface!

Claim a spectacular bonus offer below and experience an underwater adventure on the reels!

Great Blue Slot

Great Blue Slot Review

Table of Contents

  1. About Great Blue Slot
  2. Design, Symbols, and Graphics
  3. RTP, Variance, and Payouts 
  4. Gameplay and Features
  5. Our Verdict

The deep sea, fish and slots go together swimmingly, and many slot developers would agree. In fact, we have been treated to some amazing ocean-themed slots recently, such as the Pirate Sharky slot and the 9 Pearls Of Fortune slot.

The Great Blue slot, however, offers something more classic and basic when it comes to game mechanics and features. You can count on encountering Free Spins and a Gamble feature, as well as some other interesting surprises.

Great Blue slot

About Great Blue Slot

The grid layout of the Great Blue slot can be perfectly described as classic. Featuring 5 reels, 3 rows and 25 paylines, it’s safe to say that it isn’t anything players haven’t encountered. Wins are formed in the standard way, which means that you only need at least 3 (and in some symbols’ cases 2) matching symbols across a payline starting from the leftmost position.

Speaking of paylines, you can choose how many of them are active. This, in turn, affects your bet amount, which can be as low as £0.25 and as high as £125. The maximum payout may potentially reach up to 10,000x your stake.

Design, Symbols, and Graphics

When it comes to the graphics, it is safe to say that they have become a bit dated. The Great Blue slot is set under the sea, and the colour blue dominates the background. There aren’t any animations going on back there, with the only ones being saved for the grid when a win is formed.

Great Blue slot playtech

Speaking of the grid, you can find card ranks (9-A) in a bubble form as the low-paying symbols. The high-paying symbols consist of a fish, starfish, seahorse, turtle and shark. The 9, turtle and shark can form winning combinations with just 2 symbols across a payline.

The wild in the Great Blue slot is the killer whale. Wilds can help you to form winning combinations, and they can land stacked as well. More than that, whenever a wild is part of a winning combination, it doubles the won amount. The scatter is represented by an oyster, and landing 3 of them will trigger the Free Spins feature.

RTP, Variance, and Payouts for Great Blue Slot

The Great Blue slot has its RTP capped at 96.03% and is played on a high volatility model. The maximum payout may potentially reach up to 10,000x your stake.

You can find out more about RTP and Variance in our detailed Variance, Volatility, and RTP Guide.

Great Blue slot review

Gameplay and Features on Great Blue Slot

Even older releases make use of bonus features, and the Great Blue slot has two of them into which we will take a deeper look next.

Free Spins Feature

The Free Spins feature is triggered when you land 3 scatters on the same spin. You are given 8 free spins with a 1x multiplier initially before being transported to a picking game. In the picking game, you will choose two oysters, and they will reveal additional spins and multipliers.

You can win a maximum of 33 free spins and a 15x multiplier. Landing a further 3 scatters will retrigger the feature, and the Free Spins feature itself can be retriggered indefinitely.

great blue slot free spins

Gamble Feature

The Gamble feature is pretty straightforward. Each time you make a winning combination, you can choose to gamble those winnings for a chance of increasing them. You will have to determine whether the next card to pop up will be red or black. If you make the wrong choice, you lose your winnings, so be careful when you decide to wager them.

Other Playtech Slots

Playtech is a slot developer that has years of experience behind them. They have provided us with some amazing slot games over the years. If you like the Great Blue slot, then I recommend also taking a look at the Age of the Gods Maze Keeper slot, 1-Of-A-Kind slot, and Wheels of Flame slot.

Our Verdict

The Great Blue slot offers players a classic slot gaming experience. Not packed with flashy graphics and an over-the-top presentation, it allows players to focus more on the gameplay. The bonus features work perfectly for the slot, and I especially like the fact that the Free Spins feature may be retriggered infinitely.

The Great Blue slot also offers players a flexible betting range and a great potential maximum payout of up to 10,000x their stake. All in all, it’s not difficult to see why this old title still gets regular play, and if you haven’t played it for yourself, I recommend that you give it a try.

Discover the Great Blue slot by claiming your signup bonus from this page and playing at top-rated online casinos.


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