Great Blue Slot Review: Pick Shells for Bigger Free Spins
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The Great Blue slot is one of Playtech's best-known games. It uses five reels and up to 25 paylines in an underwater world of turtles, starfish, sharks and seahorses. The whale is the wild: it doubles any win it is part of, and five whales pay 10,000x the line bet. Three or more pearl scatters start eight free spins at 2x, and before the round begins, you pick shells that can add more spins, up to 33 in total, and raise the multiplier as high as 15x. A gamble feature is available after wins.
In this Great Blue review, we explain the shell pick and help Canadian players decide whether to dive in. RTP figures vary by version, so check your casino.
Game screenshots
Great Blue at a Glance
| Feature | Details |
|---|---|
| Provider | Playtech |
| Reels | 5 |
| Paylines | 1 to 25 |
| RTP | Reported 94.3% to 96.03% |
| Volatility | Medium to high |
| Wild | Whale, doubles wins |
| Top line prize | 10,000x line bet |
| Scatter | Pearl |
| Free spins | 8 at 2x, up to 33 and 15x |
| Gamble | Yes |
Key Takeaways
- Great Blue is a Playtech ocean slot with 25 paylines.
- The whale wild doubles wins and pays 10,000x the line bet for five.
- Three or more pearls start eight free spins at 2x.
- A shell pick can raise the round to 33 spins and 15x.
- Retriggers add 15 more spins.
Theme and Design
Whales, turtles, starfish, sharks, seahorses and goldfish swim across a deep blue ocean backdrop.
How to Play Great Blue
Choose a line bet and up to 25 lines, then spin. Wins pay from left to right.
Whale Wild
The whale substitutes for all symbols except the pearl scatter and doubles any win it helps create. Five whales on a line pay 10,000x the line bet.
Shell Pick Free Spins
Three or more pearls start eight free spins with a 2x multiplier. You then pick two shells, which can add extra spins or raise the multiplier, giving up to 33 spins and up to 15x.
Retriggers and Gamble
Landing more pearls during free spins adds 15 more spins at the same multiplier. After any win, a gamble feature lets you try to double the prize.
RTP and Volatility
Published figures for the Great Blue RTP range from about 94.3% to 96.03%, depending on the version, so check the help screen at your casino. Volatility is medium to high.
Tips for Playing Great Blue
- Check the RTP. Versions differ.
- Play all 25 lines. Whale wins need active lines.
- Enjoy the shell picks. They are random.
- Gamble sparingly. It adds risk.
- Set limits. Decide your budget and time limit before you start.
Who Should Play Great Blue?
Great Blue suits players who enjoy big multiplier free spins.
Planning a Session
A bankroll of around 200 times your stake is a sensible starting point.
What a Typical Session Looks Like
In a typical session, line wins land between quieter spells, and a good shell pick can turn the free spins into the session's biggest result.
Before You Start: A Quick Checklist
Before playing, check the RTP version, set your lines and set a spending limit.
Where Canadians Can Play Great Blue
Canada does not have a single online casino market. Ontario residents can choose between OLG and private operators registered with iGaming Ontario, while other provinces offer official sites such as PlayNow in British Columbia and Manitoba, PlayAlberta and Loto-Québec's online casino. Licensed international casinos that welcome Canadians are another option for many players.
Before playing Great Blue, search the casino's game lobby for Playtech titles and confirm the game is available in your province. A good Canadian casino will support Interac deposits and withdrawals, display balances in Canadian dollars and offer responsible gambling tools such as deposit limits and time-outs. If you plan to use a welcome bonus, check that Great Blue contributes to wagering.
Pros and Cons
| Pros | Cons |
|---|---|
| Free spins up to 15x | RTP varies by version |
| Up to 33 spins | Swingy free spins |
| Doubling whale wild | Older graphics |
| 10,000x line prize | Gamble adds risk |
| Classic Playtech favourite | Shell picks are random |
How Great Blue Compares
Compared with Playtech's Golden Tour, Great Blue has a lower RTP but bigger free spins potential. Compared with Microgaming's Dolphin Tale, it uses picks instead of a package choice.
Is Great Blue Worth Playing?
Yes, for players who enjoy pick-boosted free spins, as long as your casino offers a good RTP version.
How the Shell Pick Shapes the Round
Great Blue's free spins always start with eight spins at 2x, but the shell pick can change the round completely. Extra spins make the round longer, while higher multipliers make each win bigger.
A round with many spins and a high multiplier is where the game's biggest wins come from, which is why results vary so much from one trigger to the next.
Understanding Volatility in Great Blue
Volatility describes how a slot's wins are spread out over time. Low volatility games pay small amounts often, while high volatility games pay less often but can deliver larger results when they do. Knowing where Great Blue sits on that scale helps you choose a stake and a bankroll that match how you like to play.
A simple rule is to lower your stake as volatility rises, so that your budget covers enough spins to reach the main features. If a session feels more swingy than you expected, taking a break or reducing the bet is a sensible response. Volatility never changes the odds of a single spin, but it does shape how a session feels.
Playing Great Blue on Mobile
Most Canadian casinos run their games in HTML5, which means Great Blue can usually be played in a phone or tablet browser without downloading an app. The reels and buttons scale to the screen, and the paytable and settings are still available from the menu.
Playing on a small screen makes it easy to lose track of time, so it is worth using the deposit limits and session reminders that licensed casinos offer. A stable Wi-Fi or data connection also helps, since a dropped connection in the middle of a feature can be frustrating, although the result of the spin is always recorded by the casino.
Understanding RTP in Great Blue
Return to player, or RTP, is a long-term average calculated over millions of spins. It describes how much of the money wagered on Great Blue is paid back over time, not what will happen in a single session. Two players can have completely different results on the same day, and short sessions can swing far above or below the published figure.
RTP is still useful for comparing games. A slot with a higher RTP returns more on average, so it can stretch an entertainment budget further. Some casinos offer more than one RTP version of the same game, so check the figure in the help or information screen at the casino you choose before you play Great Blue.
Bankroll Basics for Great Blue
Before you play Great Blue, decide how much you are comfortable spending and treat that amount as the cost of entertainment. Divide it by your stake to see how many spins it will cover, and choose a stake that gives you a session long enough to see the main features. If the balance drops faster than expected, lowering the stake is usually better than adding more money.
It also helps to set a win goal. If you reach it, consider ending the session or setting aside part of the winnings. Deposit limits, loss limits and session reminders at licensed Canadian casinos make these rules easier to keep, and they are worth turning on before you start.
Trying Great Blue in Demo Mode
Many casinos and game sites offer a free demo version of popular slots, where you spin with virtual credits instead of real money. If a demo of Great Blue is available, it is a good way to learn how the features trigger, how often wins land and whether the theme holds your interest, all without risking your own balance.
Keep in mind that demo results are random, just like real-money play, so a lucky or unlucky demo session does not predict what will happen later. Use the demo to understand the rules, then decide on a stake and a budget if you choose to play for real.
Choosing a Casino for Great Blue
When you look for a casino to play Great Blue, licensing comes first. Ontario players should choose sites registered with iGaming Ontario, while players in other provinces can use their provincial lottery platform or a reputable licensed operator. A licensed site uses tested random number generators and offers responsible gambling tools.
After licensing, compare payment options, withdrawal times and bonus terms. Interac is the most popular deposit method in Canada, and a CAD balance avoids conversion fees. If you plan to use a bonus, check how much slots contribute to the wagering requirement and whether there is a maximum bet while the bonus is active.
Similar Slots
If you enjoy Great Blue, try Dolphin Tale, Dolphin Quest and Dolphin's Pearl.
Mistakes to Avoid
- Ignoring the RTP version.
- Playing fewer than 25 lines.
- Gambling every win.
- Ignoring the Great Blue paytable, which shows the value of every symbol at your chosen stake.
- Forgetting to take regular breaks during a long Great Blue session.
Our Verdict
The Great Blue slot is a classic Playtech ocean game with a doubling whale wild and shell-boosted free spins up to 15x.
Play Responsibly
Every spin is random, and no strategy guarantees a win. Set limits, take breaks and never chase losses. You must be 19 or older to play in most provinces, or 18 or older in Alberta, Manitoba and Quebec. Ontario residents can contact ConnexOntario at 1-866-531-2600 for free and confidential support, and every province offers responsible gambling services.
Great Blue FAQ
Who makes Great Blue?
Playtech.
What is the RTP?
Reported between about 94.3% and 96.03%, depending on the version.
How do the free spins work?
Three or more pearls start eight spins at 2x, boosted by a shell pick.
What is the top multiplier?
Up to 15x.
Is there a gamble feature?
Yes.