Best online slots in 2025

Top 10 slots in May 2025

Here are 10 of the best online slots, each chosen for what they do best, not ranked, just categorised by standout features. From fan-favourites like Starburst to jackpot giants like Mega Moolah, this list highlights what makes each slot shine, whether it’s bonus games, big wins, or mobile compatibility. Every player has different tastes, so we’ve focused on what matters most to different playing styles.

Feature	Best Online Slots
High RTP	Blood Suckers (NetEnt)
Low volatility	Starburst (NetEnt)
High volatility	Gates of Olympus 1000 (Pragmatic Play)
Bonus games	Big Bass Bonanza (Pragmatic Play)
High max win	Dead or Alive 2 (NetEnt)
Ways to win	Sweet Bonanza (Pragmatic Play)
Mobile slot	Mega Moolah (Games Global)
High max bet	Cleopatra (IGT)
Low max bet	Book of Dead (Play’N Go)
Classic slot	Red Hot 777

Our top 10 favourite online slots

So you can get a better overview of our top 10 favourite slots, we've highlighted some of the key features of each title.

Blood Suckers

A vampire-themed slot and a NetEnt classic, Blood Suckers has a very high RTP at 98%. This is much higher than the average of 96% that we see most slots fall into.

Its high Return To Player Percentage (RTP%) theoretically results in a larger payout frequency over time compared to slots with lower figures. This is what most players find appealing, as the RTP is calculated as an average payout over a number of plays.

• RTP: 98%

• Volatility: Low

• Max win: 1014.6x your bet

• Betting range: €0.25 - €50

• Release year: 2013

Try out Blood Suckers for free

Starburst

NetEnt’s Starburst is a cosmic slot with low volatility. This means that the potential wins are more frequent but will also be of lesser value compared to wins from slots with high volatility.

Great for casual play or for players who don’t want to wait in between wins, this has made Starburst one of the most popular slots since its release in 2012.

• RTP: 96.09%

• Volatility: Low

• Max win: 500x your bet

• Betting range: €0.10 - €100

• Release year: 2012

Try out Starburst for free

Gates of Olympus 1000

In Gates of Olympus 1000 by Pragmatic Play, players will find a Greek-God-fueled high volatility slot game. A slot with high volatility means that while any potential wins are less frequent, they are potentially of greater value when they arrive.

Games like these are often associated with players who like a bit more of a challenge. 

• RTP: 96.50%

• Volatility: High

• Max win: 15,000x your bet

• Betting range: €0.20 - €100

• Release year: 2023

Try out Gates of Olympus 1000 for free

Big Bass Bonanza

Pragmatic Play’s Big Bass Bonanza has a great free-spins bonus ga me based on fishing. In this bonus round, high-paying greenfish may appear, which, after appearing four times, will retrigger the free spins bonus game.

Bonus games are an in-game feature that rewards players with things like free spins or a mini-game after completing a certain process. This step may be landing a set amount of scatters or even filling up a meter of wins.

• RTP: 96.71%

• Volatility: Medium - High

• Max win: 2,100x your bet

• Betting range: €0.10 - €250

• Release year: 2020

Try out Big Bass Bonanza for free

Dead or Alive 2 

Dead or Alive 2, made by NetEnt, brings the American Cowboy to life with its high maximum win of 111,111x the total bet. A max win is the cap on how much a player could possibly win; the higher the cap, the more money a player could theoretically win.

Many players look for games with a high max win to avoid getting capped after a certain amount of winnings.

• RTP: 96.82%

• Volatility: High

• Max win: 111,111x your bet

• Betting range: €0.09 - €9

• Release year: 2019

Try out Dead or Alive 2 for free

Sweet Bonanza

A sweet release from Pragmatic Play, Sweet Bonanza offers players a lot of ways to win in this 6x5 reel slot. A ways-to-win slot relies on a set number of matching symbols appearing across the reels rather than the usual use of paylines.

With this in mind, it increases the number of potential winning combinations, which is what makes these slot features so desirable to players.

• RTP: 96.49%

• Volatility: Medium - High

• Max win: 21,175x your bet

• Betting range: €0.20 - €125

• Release year: 2019

Try out Sweet Bonanza for free

Mega Moolah

For a great mobile-optimised slot game, Games Global developed the zoo-themed Mega Moolah. It contains all the same features and gameplay on mobile while functioning just as it would on a desktop browser.

Mobile gaming has increased in popularity with the growing rate of smartphones and players who prefer their gaming on the go. 

• RTP: 88.12%

• Volatility: Medium

• Max win: 10,000x your bet

• Betting range: €0.25 - €6.25

• Release year: 2006

Try out Mega Moolah for free

Cleopatra

The Egyptian queen-themed slot by IGT, Cleopatra, offers players a high maximum bet of €200. The max bet is the total amount you can bet on each spin. This, in turn, creates a larger payout from any possible wins.

The bigger payout potential is what entices players into slots with higher maximum bets.

• RTP: 95.7%

• Volatility: Medium

• Max win: 10,000x your bet

• Betting range: €0.01 - €200

• Release year: 2012

Try out Cleopatra for free

Book of Dead

Riche Wilde’s Book of Dead is an Ancient Egyptian slot made by Play’n Go. With a low maximum bet of €50. This is the largest amount a player could bet on this game.

Casual players tend to prefer slots with lower maximum bets, as it allows them to stay within a budget.

• RTP: 96.21%

• Volatility: High

• Max win: 5000x your bet

• Betting range: €0.10 - €50

• Release year: 2016

Try out Book of Dead for free

Triple Red Hot 777

A heavily nostalgic choice for many, slot games don’t get much more classic than IGT’s Triple Red Hot 777. As you can expect from a game of this age, its RTP is noticeably low at 92.01%. This is still quite standard for a classic three-reel slot.

Super retro and simple to play, three reels spin at different rates with the aim being to get three of the same landing simultaneously. 

• RTP: 92.01% - 96.13%

• Volatility: High

• Max win: 20,000x your bet

• Betting range: €0.25 - €50

• Release year: 2016

Try out Triple Red Hot 777 for free

Different types of online slots

When browsing the slot selection at an online casino, you may notice that they fall into different categories, such as megaways or progressive jackpots. The best online casinos will offer a range of slot genres, categorising them by their type, provider, or in order of most popular choices.

Understanding each of these categories is invaluable, as you’ll be able to find exactly what you want and where to look for it. With that in mind, here’s a look at every type of slot on the market for you below.

Classic Slots vs. Video Slots

If you were to think of a stereotypical slot machine in Vegas, you’d most likely be thinking of a classic slot. They involve three reels and offer comparatively simple gameplay compared to video slots. Classic slots come with limited paylines, a simplistic design, and give players uncomplicated entertainment, which is perfect for beginners. 

Video slots, however, have extra levels, bonus rounds, more paylines and more reels - making them ideal for players who want a bit more from their gameplay.

	Classic Slots	Video Slots
Number of reels	3	5+
Paylines	Up to 5	From 9 - 1,024+
Bonus game	Not often, a simple bonus	Frequent, complicated bonus
Appeal	Nostalgic	Immersive
% of today's slots	15%	85%

Slots with themes and storylines

Themed slots and slots with storylines have grown in popularity over the years due to their immersion and entertaining gameplay. The most popular slot themes include those that are Ancient Egyptian-themed, Irish-themed and fishing-themed.

A few examples of each of these themed slots include Book of Dead by Play’n Go for the Ancient Egyptian theme, NetEnt’s Finn and the Swirly Spin for the Irish theme, and, of course, the Big Bass series by Pragmatic Play for the increasingly popular fishing theme.

Slots with bonus rounds

Bonus rounds are in-game features that offer players free spins or a side game with exciting extras. There are different ways of activating bonus rounds. For example, in Big Bass Bonanza, the bonus round is activated after landing three scatters, which takes you into a free spins round.

If you’re ever confused, check the information (i) button on the slot to see how you can activate the bonus rounds.

Bonus buy features are also present in select slot games in certain territories, giving players the chance to activate the bonus game for a fee. The Dog House Royal Hunt offers a bonus buy as an option, with two options set at different prices. It’s common for there to be two or more choices for the bonus buy feature; one activates the standard bonus, and the others amplify the bonus.

Multi-line slots

Multi-line slots offer several paylines compared to one-line slots, which only have one payline available. Here’s what you can expect from different slots and their paylines.

• Three reels, as seen in classic slots, offer one to five paylines.

• Five reels, used in video and more complicated slots, can use from nine to thousands of paylines.

• Progressive jackpot slots give prizes that grow with each wager, meaning there is no prize cap. Each progressive jackpot can have varying paylines, but tends to match video slots and have a higher amount.

3D Slots

A 3D slot will have implemented quality graphics and visuals to give the players the illusion that they are truly 3D. Whether it's characters jumping out or symbols exploding, players love 3D slots for their immersion. 

Megaways 

Unlike most slots, which typically use fixed paylines, Megaways alter the number of ways to win with every spin, meaning they are potentially the best-paying online slots. There are different symbols which increase the variability of the slot, giving the players a larger number of ways to win. A common feature found in a lot of Megaways slots is the avalanche feature, where symbols ‘drop’ into the reel at random.

Mobile slots

Some slots are designed with mobile compatibility in mind, either adjusting the gameplay or the features to run smoothly for lag-free, on-the-go gaming. There are, however, mobile slots that are made exclusively for mobile online casinos and created for the best gameplay possible for mobile gamers.

How many slots do the best online slot casinos have?

The best online slots sites tend to have a large collection of slots, giving players more variety and choice. Below we have created a table of some of the best online casinos, organised by the number of slot games available. This is an approximate number as slot games are constantly being made and added.

Casino	Slot collection
Mr Pacho	9,000+
Mr Vegas	8,000+
SmokAce	7,500+
Wonaco	6,000+
Joo Casino	6,000+

Top tips for playing slots

When first playing any slot game, start at your normal stake level, adjusting the bets where needed. While there is no way to guarantee how to win at online slots or the best time to play online slots, there are a few helpful tips for you to get the most out of your gameplay listed below.

• Start in demo mode: Great to get a feel for the game. Free slot demos give players a chance to try out the slot for free. 

• Set and stick to a budget: Be realistic and mindful of your financial situation, and create a budget to avoid overspending.

• Use bonuses wisely: Remember that they are sometimes fixed to certain games, and always read the terms and conditions before playing. 

• Make sure the slot and casino you choose are mobile-friendly: If you prefer mobile gaming, look for casinos and slot games that are optimised for mobile.

Glossary of common online slots terms 

There is a lot of jargon used when discussing slot games and their mechanics, which is why we’ve created a table to simplify this. Using the table below will help you assess which slot is most suitable and give you a better idea of the different components of these slots.

Slot term	Descriptions
RTP	The percentage of occasions a game pays out over a significant number of plays.
Volatility	The likely frequency of wins and their value.
RNGs	Random Number Generators are algorithms used to ensure the randomness of each spin.
Betting range	The range is the minimum and maximum amount a player can wager in a slot game.
Max win	The cap on the maximum amount a player can win.
Ways to win/Paylines	Lines or ways that set symbols locations result in a win.
Wild Symbol	A symbol that substitutes for others to help form winning combinations.
Scatter Symbol	Usually triggers bonus rounds or free spins when enough appear on the reels.
Jackpot	A large prize, can be fixed or progressive, that’s often the top prize in a slot.

Responsible gambling when playing slot games

Slot games are highly addictive, which means it’s important to stay safe and in control when playing them. They are fast-paced and volatile, and the way you wager is likely to change depending on which game you play. With that in mind, we have listed some responsible gambling tools that online casinos offer to help protect you.

• Self-exclusion: You can exclude yourself from a casino for a set amount of time if you feel your gambling is out of control. The period can be anything from a few days to up to five years.

• Deposit limits: You can set limits on how much you can deposit into your account over a specific period - either daily, weekly or monthly. 

• Reality checks: These are alerts that require you to actively decide if you want to continue playing after a specific time frame, which generally tends to be anything from 10 minutes to 180 minutes.

• Timeouts: These are short breaks from playing, which enable you to block your account for anything from 24 hours to around 30 days. 

• Maximum betting limits: You can set a limit of a certain amount of money that you can stake over a period of time, for example, a maximum of £100 a week.