Which online slot machines are the best?
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Which online slot machines are the best?

This question is one that is often asked by online casino players. 

Its answer is quite subjective, given that slot machines at online casinos have an RTP that varies at around 96%. The RTP (Return to Player) is a percentage of the total money put into a slot machine that will be redistributed to players

What will change a lot, from one slot machine to another, is its volatility

Volatility is a slot machine's potential. The higher the volatility, the greater the gap between small and large winnings. If volatility is low, then this gap is reduced, and the slot machine will be more regular in its redistribution of winnings. 

From a certain point of view, the best slot machine would be one with an above-average RTP (e.g. 98%) and very low volatility. This means regular winnings, but less potential for big payouts. 

From another point of view, the best slot machine would be one with a more or less average RTP and very high volatility. In other words, the slot machine will make a lot of small wins or none at all and will pay out massively very rarely. The potential of this type of slot machine is very, very high, and it can win you the jackpot

For the purpose of this article, we're going to focus on this second point: Slot machines with huge payout potential

Exclusive bonus

Lucky7Bonus' favorite slot machines 

A lot of people ask this question. So, we're going to show you some of our favorite slots. 

Here's a list of our 7 favorite slot machine games: 

Book of Dead 

Book of Dead: This Play'n GO slot is one of the provider's most volatile. Easy to understand, Book of Dead can win you up to 5,000 times your initial bet.  

Its RTP of 96% places it in the middle of the market. The base game is fairly generous, but much less so than the free spins. 

This slot machine's atmosphere is very pleasant. The graphics, which we particularly like, will take you to the very heart of the Egyptian pyramids

This is a slot machine that you'll find at many of the online casinos on our site, including Millionz Casino

Wanted Dead or a Wild

Wanted Dead or a Wild: When we're looking for volatility, we go straight for this slot. The strength of this Hacksaw Gaming creation lies in the fact that the maximum payout can be won in the base game

Who hasn't dreamed of having 5VS displayed on their screen? We have. With a maximum payout of 12,500 times your initial stake, there's plenty to enjoy if you manage to win.  

Its RTP is 96%, in line with the market average

Among the online casinos where we like to play this slot is Casimba Casino. This site also boasts some of the best slot machine games on the market! 


Mental: It's impossible not to be frightened by this slot machine game. Nolimit City has done it again with Mental. 

The graphics are frightening, and many nightmares have been conjured up by our team members after playing this slot. Understanding this slot is also a real headache. 

After playing it for several hours, we can tell you: Mental is a difficult slot to understand but has incredible potential. With a maximum payout of 66,666 times your initial stake, a real jackpot awaits you. 

We recommend playing Mental at Stake Casino. If you manage to win, say, 15,000 Canadian Dollars, you'll be able to withdraw it without a care in the world. Keep in mind, however, that this site is a 100% cryptocurrency gaming platform. 

Gates of Olympus

Gates of Olympus: The God of Olympus awaits. A very frustrating slot machine, this game has a rare volatility in the casino. 

How many times has the x500 bomb appeared in the base game without connecting? As a player, this Pragmatic Play creation is one of the most frustrating you’ll ever play. Yet it can win you 5,000 times your maximum bet

The base game is one of the most volatile in existence. As online casino players know, when this slot decides to show its teeth, it's a rare beauty. Its 96% RTP is also a very positive aspect of this game. 

MyEmpire Casino is a highly reputable gaming platform where you can test your luck at this slot. In addition to this one, you'll love its little sister, Starlight Princess


CherryPop: This is Avatar UX's best-known creation. Like us, come and break your teeth on this slot's mythical gamble. 

It's a slot that's completely revolutionary in the industry, and it deserves its place in this article. Admittedly, volatility in the base game is fairly low. But what about its bonus? As a player, achieving the double gamble on Cherry Pop is always very welcome. 

This cascading slot is also one of the most volatile in the world. With a maximum payout of 99,846 times, start dreaming of a new life. 

CherryPop is an industry reference, as is Playfina Casino. Highly secure, this platform also features today's best slot machines. 

Fruit Party

Fruit Party: One of Pragmatic Play's most popular slot machines, Fruit Party is an excellent game. What we particularly like about this slot is its extreme volatility

Each spin can earn you up to 5,000 times your original stake. We also like the graphics and the Fruit Party principle itself. 

With a bonus buy feature available, this game is also very frustrating. How often does the slot machine perform dead bonuses? Quite often, unfortunately. 

Fruit Party is a slot machine that can be found at the excellent online casino Millionz

Razor Shark

Razor Shark: This Push Gaming creation is innovative in that it has no capped maximum win. This is something that is rather unique in the online casino world. 

In the middle of the water, the evil shark awaits you. Both free and real money games are highly volatile. That's why we love this slot. 

These are the coins which, potentially, will earn you astronomical sums. The volatility on this slot is extreme, sometimes too much so. For the player, Razor Shark is a very frustrating slot. 

Free spins are hard to come by, and once you do, there's no guarantee you'll get paid. We spend most of our sessions on this slot at Wild Fortune Casino, an excellent gaming platform with highly innovative features.  

Top 10 highest-paying slot machines 

As we have stated in the introduction to this article, we're now going to talk about the highest-paying slot machines, a ranking that we have compiled based entirely on their potential

 Here's a top 10 list of those slot machines that can pay out massively

Top 3 most-played slot machines 

Many slot machine games are released every week, but only some of these manage to stand out from the crowd and, as a result of this, end up being played by a lot of players.  

The rankings of the most-played slot machines change considerably every month. But there are 3 that have remained at the top ever since they were released. These slots have retained this top position for many years

The different types of slot machines 

When it comes to the differences that exist between slot machines, there are various aspects that come into play, not least of which is the category that each slot falls under: 

Reel slots 

This is the most common type of slot machine on the online casino market. It copies the model of old-fashioned slot machines, which featured scrolling reels made up of symbols with connecting lines

Grid slot machine 

Here's a new kind of slot machine, featuring a grid of cascading symbols with connections that are dependent on the number of similar symbols on the grid. 

Megaways slot machine 

Megaways technology is a licensed technology developed by Big Time Gaming. They also develop slot machines that feature their technology. In addition to this, they partner with other slot providers to implement it in their own slot machine games.  

This technology is based on changing the number of Ways (with adjacent connections). This can reach hundreds of thousands of possible paylines.  

These Megaways are calculated according to the number of symbols appearing on the reels. The more symbols there are, the more Megaways there are, and the higher the winning potential

Progressive Jackpot slots 

Here's another well-known type of slot machine game. It's based on a winning pot shared by all players, and the player who achieves the required conditions (a defined sequence of symbols) pockets the jackpot

The different types of possible connections 

You'll also need to consider the different types of connections that are possible on various slot machines: 

  • Adjacent connections: This type of connection doesn't follow any predefined pattern; the symbols connect to each other by being next to each other.  

  • Connecting lines: These are lines predefined in the slot machine rules. 

What also changes a lot from one slot machine to another is its design, which is created by a slot machine supplier. 

Each slot machine supplier has its own graphic style and differing features

But what is a slot machine supplier? 

What is a slot machine supplier? 

Slot machines are not created by online casinos. 

No, slot machines are created from scratch by external, licensed companies. They host them and make them available to online casinos in exchange for a percentage of the net winnings that the online casinos make on their slot machines. 

Every week, slot machine suppliers work hard to bring you new creations. Increasingly original and volatile, online slot machines are in ever-greater demand

Among the best suppliers, you'll find: 

  • Pragmatic Play: The most popular provider on the market. We like this company because it offers volatile slot machines that are a pleasure to play. 

  • Nolimit City: This Swedish company offers its players the most volatile slot machines. For lovers of thrills and extremes, you'll have a great time playing their various creations. 

  • Play'n GO: The most iconic supplier on the market, Play'n GO has some classics. Their slots are a perfect blend of volatility and high maximum payout. We like their slots because they're so easy to get to grips with. 

  • Hacksaw Gaming: Surely the most frustrating supplier. Their slot machines are exceptional, but hard and frustrating. It's this perfect recipe that we particularly like. Just like the maximum payout of their slot machines, which is always very high. 

  • AvatarUX: With Pop slots, this supplier has revolutionized the online casino. Their slot machines are very visually pleasing. Very frustrating, AvatarUX slots are addictive. With free games to bet and a very high maximum payout, this provider is one of our favorites. 

These external companies are called "suppliers" or, more commonly, "providers". There are hundreds of them, and each provider owns an average of a hundred slot machines. 

About the authorMelanie Cazenave
63 articles
✅ Reviewed by Head of Content
Expertise :
A specialist in online casinos, she also loves proofreading. With her, it's impossible for mistakes to slip through the cracks. A true lover of letters, she binds articles and retouches them to make them as perfect as possible.

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