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What are slot machines?

I can tell you that when it comes to gambling, most Canadians immediately think of slot machines. It's not surprising, as slot machines are the most popular among casino games in the iGaming industry - whether it's a real casino or an online one, real money slots account for 70% of their revenue.

But many people are not aware of what they are and how they work. Most people just know them as one-armed bandits (these made their way to Canada during the early 20th century), which tends to scare off those who might otherwise be interested in this world. However, since the gambling craze really took off (which was about 100 years ago in Las Vegas), there has been a lot of development in this area, and that includes slot machines. They are now safer to use, thanks both to technological advances and to the gaming authorities, which take strict action if any damage is done to players.

So, what are slot machines? Naturally, they give you the opportunity to play slots, so you can win various amounts of money in a fun way with a bit of luck, if you invest some cash beforehand.

slot machine, 777 slot

Today there are many versions of them, originally consisting of 3 or more spinning reels and a lever which, when pulled, made the reels spin. These were mechanical gadgets, but today you can find digital, touch-screen versions everywhere, which work on the basis of the random number generator (RNG). They can now be called video games, and game developers are taking full advantage of this, making the gaming experience even more interactive.

When the reels stop spinning, you win money depending on which symbols come out.

The short history of slot machines

It is incredible how much the world has changed in the last 100 years, and if we spare a minute to think about the variety of devices we see today, that have improved our everyday life, we are even more baffled. However, one thing remained the same: our constant need for recreation and casino games are a great way to do so.

Thanks to the constantly evolving technology, the top online casinos, as well as the real ones, are doing their best to keep up with this evolution and to provide the best slot machines. But it hasn't always been this way, so let's take a look at the timeline below to see how and why we've got to where we are today.

  • Brooklyn, New York, 1891: the world's first gambling machine, based on poker, was unveiled to the public this year. It became quite popular, even though it was not entirely fair to the players.
  • San Francisco, 1887-1895: the first automatic slot machine was the Liberty Bell, made for amusement purposes. It featured 3 reels, 5 symbols, a jackpot of 50 cents and a single payline. It was fairer to the players because it paid them automatically and efficiently, not for nothing did it become a huge success.
  • 1907: series production of Liberty Bell began.
liberty bell, first slot machine, slot machine
  • 1908: by this time, Liberty Bell was available in almost every cigarette shop, brothel and barber shop. Production of the Operator's Bell, which also incorporated a gum-vending machine, had also launched. The gums were fruity, which is why the fruit symbols on slot machines became widespread.
  • 1940s: the first slot machine with an electromechanical base was launched, Bally's High Hand, which also had its roots in poker.
  • 1963: the first fully electromechanical slot machine, Money Honey, was created.
  • 1976: the first video slot machine was developed and was first tried out at the Hilton Hotel in Las Vegas. This decade also saw the beginning of the proliferation of legal casinos in Canada.
  • 1994: the first second screen bonus round slot machine presented itself in Australia, the Three Bags Full, and it used the first online software. This year is also significant because it saw the launch of the world's first online casino - The Gaming Club, launched by Microgaming.
  • 1996: the first second screen bonus round slot machine in the US made its debut this year, the Reel 'Em In. It was the first slot game with a breakout pick and win bonus. With the expansion of the internet, online casinos have also begun to emerge, bringing the world of online gambling to Canadians. They quickly became hugely popular among them, that could be due to free slots, which came along with online casino gambling and have since enjoyed uninterrupted success.

Since these times, slot machines went through extraordinary changes, from heavy and noisy machines that took hold of generous spaces in traditional casinos, to modern video games that you can access from your mobile phone or home computer, as long as you have a decent internet connection.

The very first online casino was founded in 1994, with 18 games available on the platform. This has gone a long way to establishing the success of online casinos today, as they offer a great way for anyone to enjoy a taste of gambling from the comfort of their own home.

What are free online slots? Can we play free slots online?

But of course that you can play free slots online! Nowadays, there are almost 8 000 free online games on gaming websites that you can access from within the confines of your home, provided you possess a modern device and a good enough internet connection.

Free casino slots are free online games that you can try without being obliged to wager real money. The multitude of games and the endless range of themes make these online casino slots difficult to resist. You can play the best free slot games without making deposits or hitting the sign-up button.

Besides, you do not have to worry about anything else; all you have to do is to enjoy the ride. Many online casinos allow you to play for free, which they show by making more and more demo versions of their online slot machine games. I suggest you check out the free slot games first before you decide to bet real money. This is the easiest way to find that specific game that you will want to win real cash with.

Play for free, play slots! Maybe you will like it so much, that you will decide to try out more free slot games. Thankfully, nowadays even more online casino games developer supports free slot machine games, so you can find your favorite slot games and the most fun slots without risking anything.

Understand free slot machines - the terminology of spin games

If you choose to play free online slots, chances are you'll do so because you'll want to try real money casino games afterwards to win real money - if free online slots are to your liking, of course. When it comes to casino games, even free slots, it's important to understand what you're doing and what's happening on your screen. There's no risk in free play, but it's never a disadvantage to actually understand what you're doing - even if you're just having fun.

With this in mind, I've decided to help you on your adventures in the world of online slots and online casino games, and have compiled the glossary below. You can familiarize yourself with the most important terms you are sure to come across when you play free slots.

Also, remember that when you play online, you need to be extra careful, as you can find a lot of misleading information. All the games are more enjoyable, if you are safe.


They determine whether you win on a spin. These are concrete lines showing winning combinations of symbols, running from left to right along the reels. In modern online slots machines, as in free slots games, there is usually more than one payline, which varies in shape, they aren't just straight lines anymore like in the early machines.

You can choose how many paylines you want to bet on. The more you choose, the better your chances to win big, but be careful! It also increases your total bet per spin. So these lines have a strong influence on your chances of winning, they play a key role.


The vertical part of the reels of the slot machine. They show different symbols, which determines whether or not you win when the reels stop spinning. The symbols vary, changing depending on the theme of the game.

Slots used to have only 3 reels, but nowadays they can have 3, 5 or more. The aim is to wish that the reels stop when the symbols are in the right payline in the specified combination. You can win several things depending on which combination you land: you can win free spins, real money, progressive jackpots, extra prizes, bonus rounds, free spins and free spins bonuses, access to bonus games and a lot more!

Dynamic reels

Reels with symbols that contain various animations and interactive elements, making the game even more enjoyable. In addition to enhanced visual elements, they also include expanding reels and thematic effects.


Horizontal sections of reels where the combinations of symbols appear. The more lines, the more symbols and combinations there are. For example: a slot machine has 5 reels and 3 rows, this is called a 5x3 configuration and means that 15 symbols are displayed at once when the reels stop spinning. This is important to understand because it has a big impact on your chances of winning.

Grid matrix

The way the symbols are arranged on the reels - a grid-like pattern of reels and rows. This layout is important because it determines the winning combinations, paylines and game mechanics.

Penny slots game

Slots that allow you to play with very small amounts of money. The name comes from the fact that you could spin on them by playing 1 penny. Nowadays, this is a bit misleading as the amounts are higher but the minimum stake required is still lower than other slots.

It can be fun for those who like to gamble for money but don't want to risk significant amounts. Always check the minimum betting requirements before playing casino games and real money slots!


A guide you and all other gamblers, summarizing the different winning combinations, their payouts, special symbols, bonus features, bet multipliers, jackpots and game rules. This is usually available within the game, with a dedicated button/icon.

Wild symbols

The joker of the casino world - wild symbols substitutes for other symbols to help create winning combinations in your real money slots, as well as in your free slot game. There are different types:

  • normal wilds,
  • expanding wilds - they cover other reels too,
  • sticky wilds - they stay in place for your next spin,
  • stacked wilds - appear stacked on a reel.

Often, wilds also offer enhanced payouts or multipliers.


Special symbols with unique features, which provides bonus features and rewards regardless of where it is placed - i.e. it does not have to be in a specific pattern.

Most often, it can be used to win free spins and other features when a certain number of these symbols appear on the reels, usually 3 or more. They may also offer payouts and multiplier payouts.


From the volatility of free casino games, you can determine how often and with what probability real money casino games will pay you out. There are 3 levels:

  • low volatility: frequent but smaller wins, more regular payouts;
  • medium volatility: a mix of small and medium payouts, a balanced experience;
  • high volatility: infrequent but significant wins.

You decide which is the most attractive for you, and this is another good criterion to help you find the right online slots, even if you play for free. Online casino games are never boring, are they?

Return to player, aka RTP

A metric that shows what percentage of your money wagered is paid back to you by online slots. For example: a 96% RTP means that for every $100 wagered, the game pays $96 back to the player over a longer period of time. The remaining 4% is the house edge, or the casino's edge, from which it generates its profit.

Important! This calculation is based on millions of spins, which means that you are not guaranteed to get this percentage every time.

It's useful because it gives you an insight into the expected payouts of a game, which is always important when you play slots.

Hit spin

A feature that gives you more frequent wins or a higher chance of winning. When activated, you get a predetermined number of spins. These usually bypass the normal game mechanics, guaranteeing that you win.

How do we rank slot games?

The complexity, the abundance of features or themes have diversified so much in time, that gamblers from around the world can play for fun in such ways that no one has ever seen before. This applies not only to real money online slots, but also to any free slot game.

The evaluation of slot games is largely subjective, as everyone has their own individual preferences, as you will see for yourself when you start playing. Still, there are some aspects that can support a general evaluation, like game features (in-game options and functions), volatility, RTP percentage, game design and theme, jackpots and user experience (UI, navigation, mobile device compatibility).

If you visit our website, you will discover lots of information about free casino games and online casinos that are safe to work with. For further information, keep reading, as I took the liberty to list the best of these, as well as the types of free slots online games.

Slot types

Besides the classic slots that we have referred to right from the start, there are other types of slots worth mentioning, like online video slots with 5 or more reels, progressive slots (meaning they have a progressive jackpot), 3D slots, Vegas slots, Caesars slots or virtual reality (VR) slots that allow you to enjoy more realistic gameplays.

You can find these types of games even if you choose to play for free or when you make a deposit at one of the online slots.

Classic slots game

The typical one-armed bandit, which I mentioned at the beginning of this article, is what everyone thinks of when they hear the word 'slot machine'. 3 reels, 1 payline - perfect for those who are fans of traditional gambling or just don't like too many extras. It offers fewer paylines, reels and special features than the other types. The developers of these game's software have done this on purpose, and the symbols are reminiscent of the old-school casino atmosphere (fruit, bells, number 7, etc.).

I recommend it to all Canadian players who want to focus on the essence of the game and gamble for the sake of the game itself, rather than chasing the extras.

777 slots

A special type of classic slot machine. There are many similarities between the two, but they are not necessarily the same. The theme is entirely based around the number 7.

Video slots

Video slots are machines with 5 or more reels offer a variety of themes, high-end graphics and a wide range of bonuses (like bonus rounds, progressive jackpot, free spins etc.), making them the most popular type of online slots, and the most popular type of free slot machines as well. In fact, video slots are now actual video games that use the latest iGaming technology.

I warmly recommend video slots to Canadian gamers who want an action-packed experience and an assortment of themes. To name just a few: fishing, ancient Egypt, farming, pirates, lost civilizations, the Wild West, animals, space travel, mermaids, time travel, dragons, Greek mythology, steampunk, ancient Rome, Scandinavian mythology and gods, etc.

3D slots

As the name suggests, players can enjoy a three-dimensional visual experience without the need for 3D glasses.

Mobile slots

Mobile slots were made specifically for smart devices, so they are fully mobile-optimized. A lot of people prefer to play casino games on their mobile phones and tablets. More and more online casinos are creating mobile apps, and nowadays there are even online casinos that are specifically designed for people who prefer to sign up only from mobile, as millions of people prefer this platform.

Progressive slots

The idea is that the jackpot amount keeps increasing as long as you're in the game, with each new bet adding to that amount. This type of slot is one way to win life-changing prizes. It looks like video slots, but the jackpot can be triggered at any time. The most popular of the jackpot slots is the Mega Moolah series. In Mega Moolah the jackpot amount starts from $1 million dollars.

Megaways slots

A dynamic reel structure that changes with every spin, so the number of symbols remains variable - meaning there are hundreds of thousands of ways to win. This type of game was the brainchild of game developer Big Time Gaming.

Branded slots

They cover popular franchises, films, TV shows, celebrities and blockbusters.

Vegas slots game

The real casinos of Las Vegas inspired the theme, atmosphere and features of this type.

Caesars slots

Inspired by ancient Rome and the figure of the extraordinary Julius Caesar. Historical, mythological and cultural elements are incorporated into these games.

Virtual reality slots

As the name suggests, technological advances in virtual reality support this type. It's also three-dimensional, but you can not only watch it through the screen, you can actually be part of it thanks to the VR headset. This type is still very much in its infancy.

Free Online Slots

Our top 5 slot machines

On our webpage, you can find hundreds of free online slots from different game developers and with a great variety of themes, from fruit-themed games to games rich in historical characters, exotic sceneries or cartoon characters.

Due to our predilection for history and blockbuster adventure movies, we present you our top 5 free slot games that are inspired from ancient mythologies of Greece, Egypt or from different historical events.

You can also start playing and try them right now!

Slot 🎰

Reels ➿


Provider 🤠





Da Vinci Diamonds




Wild Life




Triple Diamond




Merlin’s Grimoire


7 776

Play’n GO


Developed by Yggdrasil, Achilles is an extremely entertaining online slots featuring Achilles, the mighty Greek hero, who fought in the Trojan War more than 3 000 years ago. Nevertheless, he is not here to disclosure his fighting abilities, but to help you win. The game features 20 paylines, 5 slot reels and 3 rows, free spins, bonus games and a RTP (return to player) of 94.99%. And you can play for free with this great game, not to mention that you can also trigger free spins!

Da Vinci Diamonds

Da Vinci Diamonds, launched by International Game Technology (from now on: IGT), is an online video slot inspired by Leonardo Da Vinci. It has an average RTP of 94.93%, a 5x3 grid layout and 20 paylines. The game features many of Da Vinci's works, including the iconic Mona Lisa, and it also offers free spins and free play.

Wild Life 

Another IGT creation, also an online video slot, but this time the theme is the African safari through the savannah. It has an RTP between 94% and 96%, a 5x3 grid layout and 50 paylines. It has a vibrant visual experience and its symbols are full of African characteristics. Wild Life has free spins and a free play option as well as the others so far.

Triple Diamond

With an RTP of 95.06%, Triple Diamond is more traditional than the others, as it has a 3x3 grid matrix and only 9 paylines, but this doesn't come at the expense of IGT's skill in game design. The gameplay is very simple, easy and nostalgic. It doesn't have a free spins bonus option, but you can find it among free slots and can play for free!

Merlin's Grimoire

This literature inspired game is developed by Play'n GO, where Merlin and the Grimoire (or the book of spells) are the main characters. I am sure that everyone has heard about Merlin, The Great Wizard and about the Celtic tales of King Arthur. The game has a 5x3 design and up to 7 776 paylines. You can also play for free with this game and enjoy some free spins.

Why you should play free slot games online?

Free slots represent an ideal way to sit back and relax while enhancing your skills. You can enjoy free play and online slots from anywhere on this planet, be it a coffee shop, a park or even on a beach, if the spot has a good internet connection. You do not have to download free slots because they are ready to play. They are available for iOS, Android, Windows or Linux. So free slots are undoubtedly comfortable to play for free.

In case you are a rookie in this industry or you just don't want to risk losing your money in slot playing, these free slots are perfect for you. The free play or demos give you the possibility of testing the mechanism of a game, its characteristics and the important features that come along.

There are thousands of different free slots that you can play without downloading anything or without having to commit to registering - meaning thousands of amazing opportunities to master your abilities and become a professional player with free play. You get the chance to familiarize yourself with the specific terminology, such as RTP, paylines etc. I've covered this for you earlier in this article.

Among other characteristics that a novice player should pay attention to, even are:

  • the RTP feature, meaning the average payout that a player could win,
  • bonuses that trigger more free spins and promotions like the welcome bonuses,
  • the number of reels, rows and paylines,
  • the volatility of the game.

Just take your time to assimilate all this new information because it gives you a better understanding of your needs and preferences when choosing your next game to play for free. The world of free slots can be confusing in the beginning, with a never-ending list of terms and definitions, but it becomes more and more alluring as you dive in.

Another advantage of having access to this huge amount of free online slot games is the unlimited time that you can spend with free play, absolutely free of charge and no strings attached (except when you have to recharge your device).

How to play? How to maximize the experience when you play for free?

In case you have never played an online slot game before, try one of our recommended free slots listed on our website. Some of you might be appealed by a game's appearance or central theme, while others may be drawn to the multiple winnings that could be obtained.

After choosing the game you want to enjoy through free play, it is advisable that you check the paytable, which is a sort of instruction manual, to find out the symbols that appear in the game and their value.

A spin button sets the reels in motion once pressed. Every time you win, the results will be displayed on the screen. You will also be informed about the name of the game and the theme (like world games), the name of the game developer (Intouch Games for example), the number of the reels and rows of the grid matrix, the number of paylines, RNG (which is the random number generator), volatility and RTP.

If you want to learn more about the last two features we have just mentioned, take a look at this exhaustive tips and tricks slots guide on our website containing all the information you need to know about slot machine games.

Best online casinos to play online slots through free play

As promised earlier, I recommend online casinos that are my personal favorites when it comes to free play. At each of the 3 casinos listed below, you can try all the slots for free, plus you get a top-notch user experience, even without registering. So my top 3 online casinos from free playing perspective, that you can also use and enjoy from Canada, are the following:

  • Lemon Casino,
  • Powbet Casino,
  • Energy Casino.

So, if you want a totally reliable, comfortable way to relax without any charges, go to these sites and check them out. All 3 of them are fully mobile-optimized, so you can easily access them not just from a desktop computer, but from any smart device.

Useful tips to remember when you are playing Penny Slots

All these years of playing all kind of slot games made us conclude that writing an overview of tips and tricks would be a great help.

From our experience, the best way to shed some light onto this intricate world of games is to begin with the search of those online casino sites that are certified and professional. We have made up a compilation for you about which online casinos websites we consider trustworthy, so you can always come back to this page whenever you are in doubt or want to learn more. In our opinion, it is extremely important to make this research before you play online slots, and to surf the web a little bit in order to discover the most suitable casino for you. Don't forget that we are here in case you need extra guiding!

The next step is to test the free online slot games that require no download or registration. If you do this, you will be able to understand their mechanism and can estimate your preferences or the strategies you plan to adopt. The demo versions give you the possibility to enjoy a good game without the risk of losing any money. In order to apprehend the way they work, make sure you understand the content of the paytable and the specific vocabulary used in this industry. Terms like wilds, scatters, volatility may seem weird at first, but with practice comes knowledge! We are sure you will get used to them in no time. Another recommendation is to read our game reviews before trying out a new game.

Adopt a strategy! We all know that practice makes perfect. Testing several free games ensures that you hone your skills and, when trying games that require deposits, you will be ready to put all those strategies to work. The best strategy that you can come up with is using all the knowledge that you have internalized so far by playing and observing.

Claim your bonus! The moment you have decided you want to play for real money, make sure that you search for those online casino websites that present new games. They are more willing to offer all kind of promotions in order to lure new players. In contrast to traditional land-based casinos, online casinos offer a larger range of welcome bonuses due to their small maintaining costs.

Be disciplined! As we indicated in the beginning of this article, always remember that the goal of playing slot games is to play for fun. It's no use in taking things too seriously and getting too attached to this kind of entertainment. Decide upon a small sum of money that you want to invest in the slot games and try not to exceed it. It is highly important to know when to stop. Moderation is the key. Play responsibly.

Play only with trusted casino game providers

In the last 20 years or so, hundreds of online slot machines creators have made their entrance on this fascinating stage of entertainment games. The transformations these games have gone through are incredible.

providers, online slots, slot providers

Game developers are constantly trying to outrun themselves, making this industry look more and more glamorous and innovative. Because there are so many game providers in this industry, we have tried to make up a list of trustworthy slots providers we are collaborating with. Further, we will mention only a few of them here.


This Swedish company founded in 1996 is one of the pioneer game company in this huge industry. It is also one of the most appreciated software developer in the world. A lot of gamblers agrees on the fact that NetEnt has some of the most beautiful games in the industry, not to mention that all of these games are well-optimized. No wonder, that the team received several awards throughout the years. For more info, check on our website a comprehensive NetEnt slots review.


This British gambling software company that has been entertaining its public since 1994, and it's very reputable and trustworthy. Among their best-known slot games, we can mention Game of Thrones, Jurassic World or Lara Croft Temple, all inspired from the famous blockbusters. Check our collection of Microgaming slot games on our website.


It can boast with a set of over 500 online casino penny slots with outstanding visuals and design. It was founded in Estonia in 1999 and is definitely a ground-breaker in the gambling industry, which operates in more than 20 countries. It holds a firm ground in every dominant game genre in the iGaming industry, and has the most significant presence in the online video slot community. More info about Playtech and our selection of Playtech online slot games can be found on our site.

Pragmatic Play

Founded in 2015, this team launches top-rated slot games that are available to anyone for free, without the need to download or register. Though the Maltese company is relatively new on the market, it succeeded to come into prominence in a highly competitive industry. We can name a few titles that captured our attention: North Guardians, Zombie Carnival, Gates of Olympus or Peaky Blinders. For more information on the subject, check our selection of Pragmatic Play online games on our website.

Play'n GO 

This one is also a Swedish gambling company, founded around 1997. The team is different from other developers in that it focuses primarily on the European market, but also puts quality before quantity in all situations - this means that they have fewer games than other providers, but all their games are at the cutting edge of both technical and visual development. When you play games from them, you feel that you are the most important to them. Among their most famous slot games, we can mention Leprechaun's Vault, Lordi Reel Monsters or Book of Dead. For extra data on Play'n GO slots, check our website.


The Maltese creators behind affirm that they are something more than just a gaming company. Founded in 2013 and named after the Norwegian Tree of Life, they have an unusual and unique style - they're my personal favorites. They are also new on the market, but that didn't keep them from obtaining international recognition. They can boast with unique and high definition graphics. Their most known games are Achilles, Vikings Go Berzerk, Hammer of Gods and Valhalla Saga: Thunder of Thor. For more info, check this ample review on Yggdrasil slot games on our website.

Red Tiger 

One of the most successful developer in this industry because it delivers astonishing and fascinating online casino games, though it has barely entered the market since it was founded in 2014 in the Isle of Man. They developed games like 10 001 Nights Megaways, Narcos Mexico, Dracula Awakening and Age of Akkadia. If you want to learn more about this game provider, make sure you check the survey on Red Tiger slot games.


It was founded in 2010 in the United Kingdom, and has created many entertaining slot games since, but also blackjack and roulette. It also partnered up with big publishing and film studios, which allows them to create exclusive and noticeable branded games. We can mention games like Hot Spin Megaways, Moriarty Megaways and Egyptian King. Don't forget to check our long list of games developed by iSoftbet on our website.

Frequently Asked Questions

Yes, online slot games are legal. Playing free casino slot games is not considered gambling. In some states of the U.S., the online gambling is legal, and it is also legal in most of the European countries. We have gathered plenty of information about online casinos that are trustworthy and anytime you want to test one out, check our review about online casinos on our website.
A free slot does not require making an account or downloading the games, nor betting with real money as it is the case with real money machines.
If you are a rookie in this industry or you just do not want to risk losing your money in slot playing, these free games are perfect for you. The free versions or demos give you the possibility of testing the mechanism of a game, its characteristics and the important features that come along.
No, you cannot.
No, you cannot win real money if you are playing a free slot. If you want to win money, you will have to play a real slot game that requires a sign-up button and an account where you deposit the amount of money you would like to wager.
Yes, you can play free slots without having to register a casino account.
Yes, the majority of online games are compatible with iOS, Android, Windows or Linux. iPhone fans can find games on App Store while Android users can download games from Play Market. It is advisable that you use a smartphone, because the old phones cannot run the modern games. For a better understanding of mobile apps and casinos, please check the review on online and mobile casinos at Deluxe Casino Bonus.
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