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Great Blue Slot

The Great Blue slot is a high variance game from Playtech with an underwater theme. A classic!

Best Great Blue Casinos

Great Blue is an underwater 5 reel and 3 row classic from Playtech. This high variance slot has 25 pay-lines with a Bonus Game, Free Spins, Multipliers, Double or Quits game, Scatters, Stacked Symbols and Wilds that double your wins.

The Great Blue slot machine, from Playtech games, is one of our favourites if we want to spin some reels rather than the wheel. I guess that’s because this is a high variance slot (like the Deck the Halls slot).

What does that mean? Well, it means that you’ll need to play it carefully unless you have deep pockets. You might go some time without much action and then suddenly- BOOM! You could hit a purple patch. And when the Great Blue slot decides to go hot, it goes really hot! The Marilyn Monroe Slot, again from Playtech, is another fantastic high variance slot.

This is one of our favourite slots alongside the Thunderstruck II slot machine.

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The whole idea is to catch a whale sized win in the Great Blue slot, a classic 5 reel, 25 pay-line machine. If you bag a win with killer whales, the payout is doubled. And the big news is in the bonus round.

Once you set it off, you’ll get a minimum 8 free spins with all wins doubled. You will need to choose one of the shells to increase your rewards up to a maximum of 33 free spins with a multiplier of up to 15x.

Payouts in this watery thriller can get to a HUGE 20,000x your stake win! of course, you are not going to see this very often. But you might.

Dive into our review below for more details…

Pros and Cons

  • The maximum win is big. Up to 20,000x your line bet.
  • You can re-trigger the free spins in the bonus round.
  • The underwater soundtrack. Strangely relaxing once you turn it down a bit!
  • It’s not the most up to date slot in terms of graphics. But that doesn’t seem to bother its legions of fans.

Best Casino for the Great Blue Slot

We recommend for this game. They are great for roulette as well, incidentally, with plenty of variants for desktop and mobile players.


The Great Blue slot is a Playtech video slot machine with a supercharged bonus feature that offers up to 33 free spins and a 15x multiplier. This is a highly volatile slot machine- things can go very quiet, but they kick in with a big BANG if they do arrive. If you land 5 Big Blues on an active pay-line (the killer whales), you will win 10,000x your line bet. Fingers crossed for that one!

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Great Blue is a 5 reel 25 Playtech slot with an oceanic theme and whose star is a killer whale called Great Blue. You can bet from 25p/c a spin all the way up to £/€/$ 125 a spin. You’ll need very deep pockets at this level so be careful.

There are stacked wilds and scatters in this game. Collect 3 or more Sea Shell scatter symbols anywhere on the visible reels to set off the Great Blue Bonus. You’ll get eight free spins with a 2x multiplier. Then pick 2 of the 5 sea shells to get more free spins and multipliers. You can get up to 33 free spins and a 15x multiplier.

You can also retrigger 15 free spins in the bonus game if you get 3 or more scatters again at the same multiplier. If the Great Blue slot is feeling generous, it can retrigger and retrigger. Read the full Great Blue review at SlotSites. Well, we did say it was high variance!

Bear in mind that you will need a decent budget to play this game, otherwise you might very well just get wiped out early on. And nerves of steel! But it can go crazy and go on runs of big pay outs.

Great Blue Jackpot

In 2018, Playtech launched a jackpot version of their famous undersea slot: Great Blue. this is pretty much exactly the same as the original game, except you will have the chance to win one of four progressive jackpots in the Playtech network.

The RTP has been lowered , due to the fact that you will need to feed the 4 progressives. The RTP is 95% (compared to 96%).


Great Blue Questions

  • What is the RTP of the Great Blue slot?
    The return to player on this Playtech game is 96.03%. We´d say that’s about average for a slot of this kind. This is a highly volatile slot so play carefully. You will need to organise your budget so that you are able to spin through dry periods.
  • How many bonuses are there on this game?
    Great Blue has been around a while, so it’s a pretty traditional game with just one free spins bonus. You trigger it with 3 or more sea shell scatters. Then you go into a picking game where you can increase the base free spins (8 standard) and multiplier.
  • Can you re-trigger the free spins in the bonus round?
    Yes you can. This is one of our favourite features. In theory they could go on and on.. In practice, they don´t of course, but you can get onto a nice run.
  • What is the MAX win on Great Blue?
    20,000x your bet. Now can you see why this game is so popular?
  • What is the Highest Paying Symbol?
    That would be the Killer Whale wild which pays 400x for 5 on a payline. Next up are the sharl and turtle which pay 30x for 5 on a payline


Great Blue Slot
5 x 3
Maximum win
Volatility level
Bonus Game, Free Spins, Multipliers, Gamble Gamble, Scatters, Stacked Symbols, Wilds
Undersea, Orca, Killer Whale, Starfish, Blue, Turtle
June 2013