Great Blue Jackpot Slot Review

Carrying an RTP of 95.02%, the medium-variance free online slot is very similar to its predecessor in that it has 5 reels, 25 paylines and the same bonus features. In fact, other than a few aesthetic changes, the only difference is the progressive jackpots.

Where to play Great Blue Jackpot for real money

Basis of this table: the welcome offer each brand publishes for new UK accounts. It is not a list of casinos carrying this game — Lobbies change without notice: check the game is in the operator’s own lobby before you deposit for it.

Apple Pay5 of 8 shown

1. 1

   Jackpot City CasinoBetway Limited · UKGC 39372

   WELCOME PACKAGE100% up to £100+ 100 free spinson a first deposit of £20 or more10x wagering

   TrustlyPayPalOnline since 1998

   Get bonus T&Cs apply · 18+
2. 2

   Luxury CasinoApollo Entertainment Limited · UKGC 38620

   WELCOME BONUS100% up to £1000on a first deposit of £10 or more

   PayPalMaestroOnline since 1998

   Get bonus T&Cs apply · 18+
3. 3

   PlayOJO CasinoSkill On Net Limited · UKGC 39326

   WELCOME BONUS50 free spinson a first deposit of £10 or moreno wagering

   Apple PayTrustly

   Get bonus T&Cs apply · 18+
4. 4

   Karamba CasinoWhite Hat Gaming Limited · UKGC 52894

   WELCOME BONUS20 free spinson a first deposit of £20 or more10x wagering

   TrustlyPaysafecardOnline since 2005

   Get bonus T&Cs apply · 18+
5. 5

   Spin CasinoBetway Limited · UKGC 39372

   WELCOME BONUS150 free spinson a first deposit of £20 or moreno wagering

   PaysafecardSkrillOnline since 2002

   Get bonus T&Cs apply · 18+
6. 6

   Swift CasinoSkill On Net Limited · UKGC 39326

   WELCOME PACKAGE100% up to £25+ 100 free spinson a first deposit of £10 or more10x wagering

   Apple PayTrustly

   Get bonus T&Cs apply · 18+
7. 7

   Betway CasinoBetway Limited · UKGC 39372

   WELCOME BONUS150 free spinson a first deposit of £20 or moreno wagering

   TrustlyPaysafecardOnline since 2006

   Get bonus T&Cs apply · 18+
8. 8

   Play Jango CasinoSkill On Net Limited · UKGC 39326

   WELCOME PACKAGE100% up to £25+ 77 free spinson a first deposit of £10 or more10x wagering

   PaysafecardPayPal

   Get bonus T&Cs apply · 18+

Show all 8 casinos

Last updated October 15, 2026 · Every brand listed here holds a current UK Gambling Commission licence; the licence holder and account number are printed on the brand’s own row.

Advertising disclosure: Gamblib earns a commission when a reader opens an account through a Get bonus link, and the order of this table is commercial as well as editorial. Commission never changes a published finding, a licence check or a set of terms — see how we rate. Offers and terms are those published by the operator on the date above and change without notice; always read the bonus terms on the operator’s own site before depositing.

18+ only. Gambling should cost no more than you have decided to lose. Free, confidential help in the UK: BeGambleAware, GamCare on 0808 8020 133, and GAMSTOP to block yourself from every UK-licensed site at once. The tools and how to switch them on.

As you might be able to tell by the title of this slot, Great Blue Jackpot is themed around the deep blue oceans on our planet. Humans have only been able to discover 5% of the floor of these oceans, so there is still so much mystery around what can be found down there. In this slot’s case, we hope to discover some excellent payouts to be had. And there just might be some, considering the bonus features such as free spins, multipliers and four different progressive jackpots available during play.

Setting Sail

In a graphical sense, the free Great Blue Jackpot slot scores quite highly, and you can tell that it is a modern release. All the reels spin flawlessly and all other animations have been created to a high standard. The symbols you can expect to find on the reels consist of a range of different sea creatures such as turtles, starfish and sharks. Playing card symbols ranging from 9 through to Ace also appear here.

The Killer Whale wild symbol is where you can land the biggest payouts on the reel – apart from, of course, the progressive jackpots. You can get 10,000x the line bet when the wild is found five times on an active payline. It also performs its wild symbol duties of replicating any symbol required – apart from scatter symbols – to make winning combinations. The Killer Whale will even add a 2x multiplier to any wins it helps create.

Riding the Waves

Scatter symbols will also bring you rewards on the reels of Great Blue Jackpot. They’re also the symbols that activate the Pearl bonus round, for which you will need three or more scatters. Once you manage to do just that, you are given an initial 8 free spins with a 2x multiplier attached to any wins found. There’s a slight twist, however: before the spins start, you will be tasked with choosing two oyster shells from a total of five. Here you can either get yourself more free spins added to your total, or receive increased multipliers. There is the possibility of earning a max 33 free spins and a multiplier of up to 15x. This free spins round can also be retriggered from within, which is always a nice touch.

There are four progressive jackpots on offer, each increasing in size as players play this online slot. These will only reset when somebody somewhere claims the jackpot on offer. The four jackpots are called the fish, turtle, shark and whale, with that specific order representing the increase in each jackpot size. The jackpot game on Great Blue Jackpot is activated after any random spin of the reels. Once this happens, you will be guaranteed a win of one of the four jackpots on offer. This game basically has you picking coins until you match three symbols of a particular jackpot.

Deep Sea, Deep Pockets

Great Blue Jackpot is not going to be an ideal choice for high rollers out there due to a rather low betting range. This is quite common with progressive jackpot slots, however, so it will not come as too much of a surprise to learn that the max bet per spin is just 12.50 credits. As for the minimum bet, this could be as low as 0.01 if you decided to wager on just a single line, or 0.25 for the full set of 25 paylines.

You also have the option of trying this game out first by playing for free. This will suit you if you are not the type who likes to use real cash on a new slot you haven’t played before. Plus, whether or not you choose to play for cash, this slot was created in HTML5 – meaning mobile players will have no problem playing it, with no download needed.

Exploring Other Seas Slots

There are plenty of other online slots out there that are water-themed. If you have a love of the deep blue sea, you will not have to go looking at what the online casinos have to offer for too long. To make the search even quicker for you, we recommend a couple that we feel are among the best out there.

1429 Uncharted Seas is one such entertaining slot themed around the vast open seas. This 5-reel, 25-payline affair was developed by the creative team at Thunderkick. Here you can expect to see features such as wilds, scatters, multipliers, and a free spins round that could land you as many as 50 free spins of the reels.

Mermaids Millions by Microgaming is another great alternative, and due to its popularity, it can be found at many of the better online casinos around. While playing this 5-reel, 15-payline slot, you can take advantage of a bonus round, wilds scatters, and a free spins round with a 3x multiplier attached to any wins you might be lucky enough to land.

Deep Sea Summary

Great Blue Jackpot might not be too different from the original slot, but at least the addition of four progressive jackpots will be seen as a nice bonus by fans of the first version. The gameplay is very similar and will provide an entertaining experience for any player who takes the time to try it out. Among the features, you’ll certainly be looking forward to those entertaining free spins the most, since they can really lead to some big payouts. So, are you ready to dive right in?