Top 10 Slot Games of All Time - Official SlotSource Rankings

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The online slots sector has seen a huge shift in the quality of games that are now produced. They can take advantage of technologies such as mobile gaming and also developer platforms such as HTML 5, which allows for not only a better range of slots but a more in-depth gaming experience at top online casinos.

Below we’ve includes some of the best online slots in the world right now. Make sure that you mark our Slots Calendar page as the list is ever-changing as new games are released.

Book of Dead

Book of Dead is one of the classics of the online slots sector. It’s been around for several years now and from the outside looking in, we understand why people who aren’t familiar with the game would question its inclusion in our list.

However, whilst the games Egyptian-based theme is about as generic as it comes, in terms of gameplay, Book of Dead is brilliantly balanced and engaging for all player types.

Games cater for all bankrolls, ranging from just 0.01 per spin, up to 50 per spin. With this comes a max win of 5,000x all rolled into the games 96.21% RTP as per default and rising slightly within the free spins round.

Play’n Go likely wasn’t aware of what a jewel they had created (or maybe they were?) but Book of Dead and it’s high volatility gameplay is now the gold-standard for online slots. Graphics, speed, gameplay, large wins, high volatility and a compelling storyline. Book of Dead has it all!

Immortal Romance

We couldn’t continue too much further in our list without talking about the Grandfather of online slots, Microgaming. They’ve plenty of games we could have chosen, but for us, the standout has to be Immortal Romance.

The theme of the game is based around a Vampire that has to, essentially, stay alive throughout the slot. What’s great about the game is that it comes with a proper storyline and even has character names, such as Michael, Sarah, Amber and Troy, who stay with you throughout your time on the game and each offering several free spins.

Immortal Romance might be all about the story, but it comes combined with a great gameplay package as well. A 96.86% RTP, 12,000x max win, medium volatility and 243 paylines from its 5x3 reel setup, just adds to the package.

Gonzo’s Quest

We often talk about some of the best slots in the business being that of branded games, but these are easy wins given they already have followings. Gonzo’s Quest is what we would class as a branded game, but they are one of few who’s brand started life as a slot and its popularity has grown so much, that more casinos host this game than just about any other.

NetEnt were able to hit a home run when they came up with the idea of following a famous Spanish conquistador, Gonzalo Pizarro y Alonso and his travels through the lost Kingdom of El Dorado. Doesn’t that just sound incredibly exciting already?

The game isn’t just style over substance though and the inclusion of NetEnt’s Avalanche and Free Falls features makes the game incredibly immersive. If you’re yet to follow Gonzo, then you need to give this a try.

Dead or Alive

Another inclusion from the ever-consistent NetEnt is that of the Dead or Alive slot. Like so many of their games, Dead or Alive has turned into more of a classic and even though it’s a few years old now, is far from dated.

The game integrates a western-style theme which includes a range of characters throughout. What you get is a 96.8% RTP, along with 30.4% hit rate and a massive max win of 12,000x.

What works so well with Dead or Alive is that the game is incredibly well balanced. Bets start from as little as 9c per spin and work up to C$18 as a max bet, offering a max win of C$216,000, and this is without a dedicated jackpot.

Dead or Alive 2

We have to include the sequel to Dead or Alive in the list as they’ve taken the platform for what is one of the greats and managed to somehow improve on that. Some of the changes have been minute, but some are very much noticeable. Whilst the games feel similar, they work quite differently.

Dead or Alive 2 has graphically improved a lot over the first instalment of the game. They’ve also added several feature rounds, which include Train Heist, Old Saloon and High Noon.

One of the biggest differences between the original and the second edition is the max win, with Dead or Alive 2 having a 111,111x multiplier in place. With the max bet staying the same in both games at C$18, this means that the biggest win in Dead or Alive 2 sits at just shy of C$2 million, making it one of the biggest non-progressive slots in the industry.

Danger High Voltage

Aussie developer Big Time Gaming land back on the list with another instalment, this time in the form of Danger High Voltage. It’s a game that is a few years old now but can trade punches with the latest and greatest even now.

The theme is an eclectic mix of bright disco lights, catchy soundtracks and big wins. High Voltage is famed for its free spins round and it’s here where most of the action takes place. You get up to 30 free spins within a single round and you’re also able to trigger the Gates of Hell bonus round within this as well.

Danger High Voltage incorporates a medium to high volatility rating and this adds to the depth of the game. An RTP of 95.67% and a max win of 15,746x add to this exciting package from Big Time Gaming.

Reactoonz

Play’n Go are without question one of the fastest up and coming slot developers in the industry right now. It’s not to say that they are new to the game, but they are starting to churn out some pretty amazing games, with Reactoonz and Reactoonz 2 being one of their flagships.

The game is unlike almost all other slots and with it comes a 7x7 grid that cascades as the game progresses. There are no paylines, just cluster pays (think Tetris) and the game has both stunning visuals and a nice soundtrack to boot.

Reactoonz is high in volatile, which some may or may not like, but one thing it does do is create a huge amount of excitement throughout. Features such as Gargantoon and Giantoonz add much-needed depth and whilst the game may seem a little complicated at first, once you get into the flow, its’ easy to see why this makes our list of the 10 best online slots in the world.

East Coast vs West Coast

The beef between the East and West in the US continues with Nolimit City sneaking into our list for the first time. East Coast v West Coast is a through back to the ’90s, with backwards wearing caps, graffiti, boom boxes and more bling than you can shake a stick at.

Whilst graphically the game is stunning, it packs a punch under the bonnet as well. With up to 84,375 paylines, a max win multiplier of 30,618x and an RTP of 96.04% (dropping to 94% in bonus rounds), this is a game that packs a punch.

However, whilst all that is great, for us, the star of the show is the soundtrack. It’s a slot that doffs their cap to the hip hop scene of the ’90s with sounds that wouldn’t seem out of place on a Biggy Smalls LP. Sometimes games just call out at you and East Coast v West Coast is one of those games!

Bonanza Megaways

For those that are involved within the slots industry, it probably comes as little surprised to see the Bonanza brand enter the list. This is the series of games that put its developer, Big Time Gaming, well and truly on the map.

But the jewel in the crown is that of the Megaways feature, which works quite brilliantly with this game. Not only do you get a balance RTP of 96%, coupled with 117,649 paylines, but with it comes a game that is high in volatility, but offers a great balance of both entertainment and the ability to win some serious coin.

Many players attribute the game to being the first of the Megaways series, but this is not the case. The main reason for this is that the gold mine slot has become the gold-standard for all Megaways games, and most are compared to this.

Within the game comes a series of 6 cascading reels, free spins rounds, multipliers, Reactions (the bonus feature) and a brilliantly captivating theme. If this is not the best online slot right now, then we don’t know what is!

Star Clusters Megaclusters

Big Time Gaming makes another appearance in our top 10 slot games of all time and this time, with another new feature. Megaclusters came on the back of the success of Megaways and it caught a lot of people out with this release. Most assumed a follow up to their hugely successful Megaways series would appear, but instead, they tweaked it again, with Megaclusters.

The lucky recipient of the game was that of Star Clusters. This game looks pretty innocuous with a 4x4 grid game. But, as the game progresses, each box can then break up to create it’s own 4x4 grid, giving a potential 64 boxes on the screen at any one time.

The game can expand father still, expanding the main grid to 8x8 and creating a massive 256 Megaclusters on the page. This is all tied in with a great soundtrack and engaging design.

With this the game includes a colossus max win of 23,000x your stake, with min bets starting from 0.20 and maxing out at 20 units per spin. A 96.54% RTP is beautifully tied into a game that strikes a balance between medium and high volatility.


All of these top titles will be available to play at the stop slots casinos we recommended, and we'll leave our top three below so you can check them out for yourself! 👇

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Top Slot Games FAQs

👀 Where can you find the top slot games?

At SlotSource we include and review a huge range of slots and then also allow you to see which we think are the best. No one game suits all players, so our top 10 best slots list provides a great range for all players to choose from.

🎰 What are the best online slots features?

Generally, you want to look for games that have a medium to high volatility rating and a theme that you’re going to be interested in. Additionally, any games that include exciting bonus rounds, features, soundtracks and graphics will be preferred.

👀 Who are the best online slots providers?

There are lots of really good online slot providers right now and we think it’s fair to say that the standard is as high as ever. Some of the standouts include Microgaming, NetEnt, Big Time Gaming, Play’n go and Yggdrasil.

🎰 Are all of the top 10 online slots safe and licenced?

Yes, all of the top 10 games on our list are fully licensed. They have to be tested by the Malta Gaming Authority of which all of the game developers on this site are licensed.

👀 Do all casinos offer the top slot games?

Not necessarily. Each casino will have a different range of games and slots to choose from. There may be multiple casinos that offer the same game, but not all casinos will offer that game.

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