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  1. Home/
  2. Rules/
  3. Great Blue

Online Casino Games - Rules Explained

Great Blue

5-Reel, 25-Line SlotLook For 5 Whales on Your Reels!

The goal of playing Great Blue online slot is to get a winning combination of symbols on the paylines. The slot also offers you the chance to win Free Games in the Seashell Bonus. The Win Multipliers in Free Games make Great Blue a popular choice for all types of casino player, including fans of online roulette and blackjack.

How to play:

  • Open the Click To Change menu to select a coin value for the Line Bet.
  • Click the Bet Per Line button to add coins to the Line Bet. Each click will increase the bet by another coin. A maximum of 10 coins can be bet on each payline. If you wish to bet more, go back and increase the coin value.
  • Set the number of paylines for the spin by actively clicking the Lines button. You can also choose paylines by clicking on the numbers 1-25 on the sides of the reels. Please be aware that clicking a number will also activate paylines below it (numerically).

Note: The Total Bet = Number of Paylines x Line Bet.

  • Press Spin to start the game when you have selected your bets and paylines. You can also spin the reels by pressing the Bet Max button. This will play the slot with 25 active paylines and 10 coins placed on the Line Bet.
  • Use the +/- buttons above Auto Start if you wish to set a number of spins to be played automatically. Click Auto Start when you have made your selections. Press Stop (replaces Auto Start) if you wish to revert back to manual play.

Note: Winning combinations will be highlighted on screen when the reels have come to rest. The total win amount will be shown in the Win Field. Winning Spins will also activate the Gamble Feature, which will be explained in greater detail in a later section.

Note: Payouts for all winning combinations are listed on the Paytable, which can be accessed by clicking the Info button.

Info Pages:

Click the Info button to launch the Info Pages, which includes the Paytable and information on special features. Use the arrows to flip through the pages. Press Back to exit and go back to the reels. Descriptions of the Info Pages are provided below:

Paytable – lists all the payouts for winning combinations. Press the Show Paylines button to load a graphic showing the positions of all 25 paylines as they appear on the reels.

Bonus – provides information on the rules and awarding of the Free Games Bonus.

Gamble – gives information on the rules of the Gamble Feature. Also displays the maximum double up limit for the game.


The objective of the main game is to land matching symbols on active paylines. These must work in chains (at least two or three symbols) from left to right starting on Reel 1. Only active paylines will pay out as Line Wins.

Please be aware that the Line Bet and Total Bet are different. The Line Bet is the amount bet on each active payline and is used to calculate a Line Win. The Total Bet is the total of all Line Bets (added up) and is used to calculate Scatter Wins.

About Payouts:

A full list of payouts for Great Blue is displayed on the Paytable Info Page. The payout figures are multiplied by the Line Bet (Line Win) or Total Bet (Scatter Win).

Only the combination with the highest value payout is awarded on each payline. Payouts from combinations on different paylines are added up (along with Scatter Wins) and paid as a total.

Wild Symbol:

Wild Symbols can stand in for any other symbol (except Bonus Scatter) to make the best possible Line Win on a payline.

Wild Symbols appear ‘stacked’ on the reels, meaning they can cover 1-3 positions on a reel.

A group of Wild Symbols will also award a unique payout if they form their own Line Win.

Scatter Symbol:

Scatter Symbols will pay out regardless of their position on the reels. Two or more Scatter Symbols in any position will award a payout (x Total Bet). Three or more Scatter Symbols will award a payout and the Free Games Bonus.

Free Games Bonus:

Press Click To Start when the Bonus has been awarded. A new screen will appear, prompting you to pick two of five Seashells. You are initially awarded 8 Free Games with a x2 Multiplier. Clicking the Seashells will reveal extra Free Games and/or an increase to the Multiplier.

  • You can win a maximum of 33 Free Games.
  • Your Win Multiplier can reach a maximum of x15.

The Free Games will begin playing automatically once the two Seashells have been opened. All payouts will be multiplied by the Win Multiplier achieved in the Seashell Bonus. Your total win for Free Games is displayed on the top right of the screen.  The remaining number of Free Games and Win Multiplier are shown on the top left of the screen.

Landing three or more Bonus Symbols on the reels during Free Games will award and extra 15 Free Games. The Multiplier will remain the same. This can be repeated infinitely.

Please note:

  • Free Games are played with the same bet specifications as the triggering spin.
  • The Gamble Feature is not available during Free Games.

When all Free Games have been played, the results will be shown on a summary screen. Press Continue to return to the main game.

Gamble Feature:

Any winning spin in the main game will activate the Gamble Feature. Press the Gamble button if you wish to enter the feature.

A new screen is launched, showing a deck of cards in the centre of the screen. You will be given the following options:

  • Red = bet that the next drawn card will be red (Hearts/Diamonds).
  • Black = bet that the next drawn card will be black (Spades/Clubs).
  • Collect = bank your winnings and exit the Gamble Feature.

Correctly guessing Red or Black will double your winnings. You will be able to Collect or try to double up your winnings again.

You can continue to double up (if successful) until the maximum double limit has been reached. This information is displayed on the Gamble Info Page.

An incorrect guess will forfeit all winnings and exit the Gamble Feature.

Please note:

  • The Gamble Feature is disabled during Auto Play and Free Games.

Return to Player:

The theoretical return to player (RTP) for Great Blue online slot is 96.03%.


The slot is played using the buttons described below:

Click To Change – opens a menu offering a range of coin values for the Line Bet.

+/- Auto Start – sets the number of Auto Spins. Press Auto Start to begin and Stop to exit.

Lines – activates another payline. You can play up to 25 paylines on each spin.

Bet Per Line – adds another coin to the Line Bet. You can bet up to 10 coins on each payline.

Bet Max – spins the reels with the maximum number of paylines and maximum Line Bet for your coin value.

Gamble – launches the Gamble Feature after a winning spin.

Spin – spins the reels with your chosen bet selections.

Casino Toolbar:

The upper and lower edges of the game screen hold general tools and displays. Descriptions are provided below:

Game Balance – shows a current display of your casino account balance.

Cashier – press to access banking options for your account. You can use the Cashier to make a withdrawal or deposit funds. It also provides options for checking transaction history.

Play for Real Money – click to play Great Blue slot for real money at William Hill Casino. This action will only be applicable if you are playing in Fun Mode.

Menu – select the tools icon to open a menu with the following options:

  • History = see the outcome of recent spins.
  • Options = adjust settings, including graphics and sounds.
  • Help = open this rules guide.
  • Online Support = contact William Hill Casino customer support online.

Close – press to end the current game session and return to the casino lobby page.

Quick Deposit – deposit funds into your account without opening the main banking menu. A selection of your preferred deposit methods can appear in a pop up window if your balance runs low.

Gadget Bar – open a gadget (if at least one is enabled) from the menu on the right of the screen. They can include mini casino games, which can be played alongside Great Blue. You may also find information on online casino bonus offers currently available from William Hill.

Note on Disconnections:

If you lose internet connection when playing a spin in the main game, the spin will be automatically completed. You can see the result by using the History Tool when you reconnect to the internet and load the game again. Only the next spin is completed if the game is being played using Auto Start. In all cases, winnings will be paid into your balance.

If you lose internet connection after being awarded the Free Games Bonus, you will be redirected back to Great Blue slot when you log into the casino again. Win Multipliers etc. will be restored and you can complete the Bonus from where you left off.

If you lose internet connection when playing the Gamble Feature, your winnings will be automatically banked and paid into your balance.

Note on Malfunctions:

All bets are voided in the event of a game malfunction. Your stake will be returned to you.

How to play casino games

Here's a rundown of some of our most popular online casino games, including how to play them, and which offers the highest payouts.

Online slots

Online slots are played more than any other online casino games. They’re relatively simple to play, which makes them a great option for beginners. Slots can also offer large payouts, particularly for a jackpot win.

Playing slots online is very straightforward. The simplest form of online slots are three-reel slots, which are based on the traditional fruit machines you may have seen in arcades. In these slots, you’ll see three columns and three rows of symbols, with the middle row being the payline. You place your bet and spin the reel, and if you get a winning combination, you win the amount stated on the paytable.

There are many other kinds of slots online available at William Hill Canada, such as five-reel slots and video slots, but they essentially work in the same way. While the odds of winning at slots are slimmer than other online casino games, they do allow you to play with small stakes on a wide variety of slots. Slots with a jackpot offer a larger prize pool, so let’s have a look at those next.

Jackpot slots

The main difference between regular online slots and jackpot slots is that the former have a lower maximum payout. With jackpot slots, however, there are larger top prizes, sometimes offering up to a seven-digit win on just a single spin.

While 'jackpot' can refer to a fixed huge cash prize awarded during jackpot games, the term is also used to describe progressive slot games. For fixed jackpot slots the size of the jackpot is, well, a fixed amount. With a progressive slot, the size of the jackpot increases each time a player places a bet on the game. Progressive jackpot slots are a great way to add to your online gambling experience. These games can offer some of the most exciting experiences of all casino games, as they provide you with the chance to win the biggest payouts you'll find online.

Online roulette

Online roulette games consist of a wheel with spaces that are either red or black and are numbered from 1-36. This popular game is easy to learn and even easier to play. All you need to do is predict where the ball will land and place your bet. The roulette wheel then spins, and if it lands on where you placed your bet, you win.

You may think that only one variant of roulette exists in online casinos, as this is typically the case at real-world casinos. However, at William Hill Canada, you’ll find multiple variants available, including a European version with one zero, and an American version with two. You’ll also find a French version that offers slightly improved odds if you bet on an even-money proposition.

Online blackjack

To win at online blackjack, you need a higher number than the dealer without exceeding 21. You are dealt two cards and can ask for another card as many times as you want before you reach 21.

One of the great things about playing online blackjack is the number of variants available. At a real-world casino, you’re restricted to just one or two games, but you'll find more here at William Hill Canada, including Blackjack Scratch, Royale Blackjack, and Blackjack Super 21.

Live casino games online

This is where online casino technology really comes into its own. Some players enjoy the thrills provided by a real-life casino but also enjoy the convenience of playing online. Live casino offers the ultimate experience to these players. The only difference between playing live casino at home and playing at a land-based casino is that with the former, the action is live-streamed to your device.

You’ll be playing at real tables, with real cards, and with real croupiers dealing your cards or spinning the wheel. Depending on the game, you'll also be playing with other players from all over the globe. With the ability to enjoy live chat with both players and the dealer, live casino offers a fantastic opportunity to enjoy an immersive experience while playing your favourite casino games online.

Enjoy free online casino games with casino bonuses

An online casino bonus is a great way to boost your balance with extra funds and make playing your favourite online slots even more fun. Casino bonuses come in a number of different forms and are applicable to a variety of online casino games.

Almost all casinos bonuses are subject to their own terms and conditions, but what you get back is certainly worth it. If you look at our current bonuses, you’ll see our welcome offer, along with any other offers we may have available. There isn’t a one-size-fits-all bonus, so just make sure to keep your eye on our bonus page in order to enjoy our selection of games the fullest.