The Best Online Slots UK – Slot Machines Rated By The Experts

The best online slots with the highest RTP in the Uk gambling market are also the best globally. From the days when land-based slot machines ruled supreme to the advent of the internet and virtual gaming, slots have remained one of the most popular casino games. The reasons for this range from the ease of gameplay to the presence of fantastic game features, right down to the array of slot bonuses and free spins available.

The number of online slot games at the online casino is on a constant rise. Since players are spoilt for choice, it’s only natural that it gets increasingly harder to choose. At montycasinos.com, we aim to guide you to the best online slots for UK players. And in this feature, we will explain the types of slots available, the features of a good slot, and how to pick them. Of course, we’ll also share our expertly compiled list of the top titles to take for a spin.

Your Guide To Real Money Slots Online

Currently, online slots are more impressive, interactive, and numerous. There are many casino slot machines, and it would be nearly impossible for you to play all. That is why expert opinion comes in handy when choosing an online slot machine.

Montycasinos.com gets gritty with these games because we are die-hard slots fans and want to provide our readers with the best information. We try out games as they hit the market, old and new, classic, video, or jackpot progressive. We then provide trusted second-hand experience through our detailed online casino review. No need to bother about the slot game jargon as we’ve got that covered too. Moreover, where you play is just as important as the bonus games, we also recommend the most reliable online slot sites UK.

Factors That Make The Best Slots Games

Online slots generally look great aesthetically, but certain elements determine how much of an amazing slots experience players can get. The major slot characteristics are:

• Payout percentage
• Paylines
• Volatility
• Bonus rounds

A higher payout percentage slot will be more profitable to players, just as numerous bonus rounds would take the entertainment level up a few notches. 

Game manufacturers use these factors to develop online slots, so it is important to understand them before you begin playing them. We will explain each one in more detail below.

Slot Payout Percentages

The amount a slot machine will return to players in winnings with respect to total stakes is its payout percentage.

That is, Total player winnings divided by Total amount wagered equals Payout percentage. For example, a 94% payout percentage means that the slot pays out $94 per $100 wagered, hypothetically. However, this long-run concept will often only apply to larger bets up to $100,000 or $1,000,000, accumulated over several thousand spins.

Nonetheless, when you play online slots with high payout rates, there is a huge possibility to win since they are designed to pay out more money over time. The payout percentage is also called RTP (Return to Player).

Here are some of the highest RTP slots available at the best UK-licensed casinos:

• Goblin’s Cave (Playtech) – 99.32%
• Ugga Bugga (Playtech) – 99.07%
• Ooh Aah Dracula (Barcrest) – 99%
• Mega Joker (Netent) – 99%
• Jackpot 6000 (NetEnt) – 98.86%
• 1429 Uncharted Seas (Thunderkick) – 98.6%
• The Catfather (Pragmatic Play) – 98.10%
• Rainbow Riches Pick n Mix (Barcrest) – 98%
• Blood Suckers (Netent) – 98%
• Jokerizer (Yggdrasil) – 98%

Online Slot RNG

Online slot machine software developers like Elk introduced the random number generator (RNG) to guarantee the game remains random and fair. This software is not prone to human manipulation and is essentially the soul and heart of the game. However, every outcome of online slot spin might seem random to players, but this isn’t completely true. Every program, including RNG-based slots, follows a foxed sequence that relies on specific conditions. Random Number Generators are still an integral part of slot machine games. Most online games are based on 32- and 64-bit RNG.

Slot Paylines and Paytables

Paylines are patterns (or lines) on the reels that award a win when you land matching symbol combinations. Lines can be fixed or variable, and variable paylines allow you to set the number of win lines per spin.

Knowing the number of paylines a game has is important because it determines your chances of landing a winning combination.

Imagine a 5-reel video slot with 20 paylines and another with 50 paylines. You will have more ways to win with the 50-line slot than with the former.

You can find the paylines displayed within the paytable, alongside the game symbols and how much each pays when you land a matching combination. Always visit the paytable before playing online slots to better understand the game’s rules.

Slot Machine Volatility

Simply put, volatility (also known as variance) describes the behaviour of a slot game. Online slots can have low, medium or high volatility. Low volatility slots will pay out small amounts frequently. The terms of maximum win is they happen less often with high volatility slots. And medium volatility cuts right through the middle.

With volatility, there is no better or worse kind. It all depends on what you expect from your gameplay – whether you’re looking to earn a couple of extra bucks with constant payouts or you’d rather hit it big on a lucky spin.

Bonus Rounds And In-Game Features

The latest online slots are all about the bonus features, commonly:

• Wild symbol – Wild symbols are a special game character that substitutes for regular symbols to complete a winning combination.
• Scatter symbol – a special game character that triggers the bonus game and often awards instant cash prizes.
• Multiplier – used to multiply the amount of a winning combination. It can be as high as 10x or more.
• Bonus game – the highlight of casino slots, where you can benefit more from wilds, scatters and multipliers. The riches bonus game is often a free spins round but can also be a pick-and-click game or some other special feature.

Top Real Money UK Slots

There is so much fun playing free slots, and nothing like real money slots embodies the essence of casino gambling. You get to enjoy the gameplay and the thrill of sweet victory when you rake in those cash returns.

Real money slots are available in different genres and are feature-packed. Also, if you’re looking to play a progressive jackpot, you can only do so when you play for real money.

Another unique advantage of these games is that you can benefit from lucrative online casino bonuses that boost your bankroll and allow you to enjoy more games for longer. Wagering contributions and other restrictions apply, but we will discuss those further down.

Low Wagering Slot Sites 

Low wagering conditions of every bonus casino are structured to allow players to enjoy multiple gambling games. They are flexible and can adapt to any gambling style that fits the player’s preference. If you’re starting, these best slots sites offer a great introduction to the gambling industry and stop you from losing so much money. 

A major benefit of low wagering sites is they make it easy for you to withdraw money. This is possible by allowing players to convert their casino welcome bonuses into real money. You can also enjoy the platform for purely entertainment and not worry about the rigours of professional sports betting. Here are the best low wagering slot sites UK to choose from:

• No Bonus Casino – Guaranteed 10% Cashback
• Virgin Games – Play $10, Get 30 Free Spins
• Rainbow Riches – $10, Get 30 Free Spins
• Pokerstars – Deposit $10, Get 100 Free Spins
• Grosvenor Casino – Deposit $29, Play with $50

Free Slots For Fun

Free slots are just as numerous as real money ones, and the best online slot selection sites offer these games for recreational players.

With free play slots, you don’t have to place real wagers before you begin spinning the reels on your favourite titles. Some sites will even grant you access without registration.

With no internet connection, you can enjoy them in instant play or download free games and revel in unlimited gaming whenever you want. Playing free games is also a great way to get new slots experience for a test spin before you start placing bets.

How to Win on Slots: Tips for Real Money Play

Winning on slots is a piece of cake once you understand how to navigate the game. Here are the best tips to get started:

Choose Your Slots Carefully

You need to understand that no two slot machines are similar. Each one comes with different themes, soundtracks and other unique features. Essentially, they have different Return to Player (RTP) rates, so it’s important to find that out at the best online casinos before you start playing.

Practice with Free Games

Before playing slots for real money, consider playing free slot machines. These games offer peak excitement and allow you to learn how the games work before wagering. 

Study the Pay Table

Each slot machine comes with its unique pay table. This shows what each symbol is worth and which ones are most lucrative. 

Stick to Your Budget

It’s vital to set a budget before you start playing. This ensures you know when to call it quits without going on a losing streak. You should only make a line bet amount you’re willing to lose. This also applies if you’re using only bonus funds. If you feel yourself losing control, you can visit BeGambleAware.org for help.

Aim for smaller jackpots

Games with smaller jackpots have more frequent payouts. This makes them ideal if you’re looking for consistent wins and not chasing big bucks. 

Understanding Slot Reels

Online slots function the same as physical slots. In practice, the reels spin to create a winning combination on the payline. Unlike traditional slot reels in land-based Indiana casinos, online slots use a Random Number Generator (RNG). The slot’s algorithm generates a random number with a dedicated symbol. With this in place, the game can’t be hacked.

How Much Can you Bet On an Online Slot Game? 

Online slots come with a variety of bet sizes. Many games allow you to wager from $0.20 to $100 per spin. This betting range satisfies most low and high rollers, while the common $0.20 stake levels the playing field for all players. That said, certain factors should determine your bet size. This includes how long you plan to play and the prizes you hope to win. You should also know that there’s higher volatility with bigger wagers, so keep track of how much you’re betting.

Scatter Slot Games 

These are casino slot games that feature the popular scatter symbols. They have different effects on each slot ranging from activating a bonus feature or even jackpots. Unlike normal symbols, you only need a set number anywhere on the reels to activate their effects. 

Scatter symbols come with huge payout potentials and colourful appearances. This makes them an attractive special feature for online casino slot players. Examples of scatter slot titles include Big Bass Bonanza, Book of Dead and Fluffy in Space.

Multiplier Slot Games 

There are real money game options, and multiplier slots are excellent. If a multiplier is hit, your winnings get multiplied by a predetermined figure. The multiplier’s objective involves doubling, tripling or increasing payouts multiplied by x4, x40 or x400. Examples of games with multipliers include Bonanza Megaways, Dragon Kingdom, and Thunder struck 2.

Megaways Slot Games 

These games use the Megaways random reel modifier mechanic developed by an Australian company, Big Time Gaming. It changes the number of symbols that appear on the reels at any given spin. The best MegawaysTM slot games include Divine Fortune Megaways, Twin spin megaways and The Dog House Megaways.

Cluster Pays Slot Games

Cluster pay is a payment system that NetEnt first introduced with the online slot Aloha. Games that use the system pay once matching positions, symbols, and betting lines appear. You should always keep in mind that the symbols need to land next to each other and touch one of the four sides. Examples of Cluster pays games include The Legend of Shangri La, Sweet Bonanza and Astro Legends. 

Mobile Slot Games

Currently, the percentage of individuals with mobile devices is appealing. That said, for online casinos to meet their customers who are always on the go, they need to be innovative. Mobile slot games are the best shot to allow players to explore and enjoy their favourite pastimes. Mobile slot games are video games that can be played on handheld devices. You can also enjoy the same game across multiple devices thanks to HTML5 technology. This lets games work for multiple game sizes. Devices supported include iOS, Android, iPads, etc. 

New Slot Games Online 

The gambling industry is never stagnant. Most times, online casino experience an influx of slot titles daily. Numerous gaming studios work hard to ensure customers are always satisfied. Moreover, few things are better than playing a new slot game on your device from any location. Here are the best new slot games to play:

• Reel of Riches
• Down the Rails
• Buffalo Toro
• Jade Shuriken
• Octobeer Fortunes
• Gates of Troy
• Happy Hooves
• Bee Hive Bonanza
• Bison Rising Megaways
• Striking Hot 5
• Wild Link Zeus

10 Most Popular Online Slot Games

Everybody loves slots because they are easy to learn. They do not require any prior knowledge before you can hit a win. Fortunately, online slot games are also an awesome way to win big and have fun simultaneously. Here are the top 10 popular online slot games of all time to choose from:

Sweet Bonanza 

This is a high variance game with an RTP of 96.48%. It has awesome graphics, and you can win as much as 21,175x your original wager. The minimum bet is placed at $0.02, while the maximum is $100.

Gonzo’s Quest Megaways 

Gonzo’s quest comes with a 96% RTP and an x21,000 max win. The game combines traditional and innovative elements to give players a unique gameplay. Every casino player should explore this particular game. 

Primate King 

Primate King is a medium variance slot with a bet range of 0.2 to 20.00 per spin. You also have a chance to win x3,800 of your stake. This is possible with a perfect combination of spins and multipliers on Primate Smash.

Legacy of Dead

This highly volatile Play’n Go game has a maximum spins limit of 25,000 times your stake in the free spins feature. You also get up to 9 special expanding symbols, increasing your odds of winning. The 5 reel game is designed with 10 paylines with an ancient Egyptian theme. 

Big bass Bonanza

Big Bass Bonanza was released by Pragmatic Play in 2020. This game features five reels, three rows and ten paylines with a rating of 3.7/5. You can win by catching three identical symbols on one of the 10 paylines. The game has a fishy theme, a strumming soundtrack and a lot of feel-good vibes. 

Gonzo’s Quest

Swedish company NetEnt provides starring Gonzalo Pizarro, the game’s software, and you get access to impressive 3D graphics that enrich your gameplay. It also comes with a high max payout and great winning line multipliers. The slot game follows the Gonzo the conquistador story. 

Wolf Gold 

Wolf Gold comes with 5 reels, 3 rows and 25 pay lines. It also has a bet minimum of $0.25 and a maximum bet of $125. A key feature is the slot gold bonus round which gets triggered through the Wolf Gold’s money symbol, i.e. a full moon. 

Bonanza

Bonanza offers 6 reels, 7 rows and 117, 649 ways to win on each play. The game is compatible with multiple devices with a minimum bet of $0.20 and a maximum of $20. Once you’ve made your new wager, the reels can be spun manually or via the auto-play feature.

Book of Dead

This is a high variance game, meaning most wins will come in small sizes. However, you can get the bigger wins in the free spins feature as the special expanding feature makes it easier to fill the reels with the same symbol.

Starburst 

The legendary Starburst has a high betting range and a stylish theme to give you a memorable gambling experience. The true casino 5 reel, 3 row and 10 payline classic game is also compatible with multiple devices so that you can play it anywhere. Wilds and respins are some bonus features. 

Best Penny Slot Machines to Play at the Casino 

Penny slot casinos are the cornerstone of modern gambling. Don’t be carried away by the name “penny.” These slots are not cheap as they are made to sound. Some players also thought that these slots had low payouts and costs. This is not exactly true. Here’s a top list of the best penny slots you can play right now:

• Golden Colts
• Blaze of Ra
• Double Tigers
• Book of Dead
• Temple of TUT
• Pirate’s Charm
• Divine Fortune
• Valley of the gods
• Gold King
• Wild Wheel Big Money

Types of Slot Machines

When you think about the abundant world of online slots, you’d wonder if they were all identical. In which case, it’d be quite boring to have to play these games when they’re faced with so much competition.

Slots are amazing because even though you simply spin the reels on every game, titles differ in theme, style of gameplay, features and design elements.

They have been classified into separate categories to make it easier to browse your favourite games. We will explain the key types in the following sections.

Classic slots

Classic online slot machine represent what these games looked like back in the day. These usually have a standard 3×3 grid setup and only a few paylines (no more than 9). Classics also offer limited winning combinations and little or no bonus features.

Although it is far from what new slots look like today, these games have an undeniable appeal.

The pure, undiluted gameplay is what made many players fall in love with slots in the first place. And classic slot game selections are indispensable at the best UK slot sites. Some player favourites are:

• Couch Potato
• Jurassic Jackpot
• Triple Magic
• Super Nudge 6000
• Break da Bank
• Triple Diamond
• Moon Princess
• Monopoly Paradise Mansion
• Big Catch Slot

Video Slots

The most popular slots online are video slots. They’ve got 5 or more reels with multiple paylines and modern HD graphics. A standout feature of this category is that the games aren’t just limited to the symbols and reel setup but also include compelling storylines and characters.

Video slots can certainly allow the creativity of a particular developer to shine. Of course, there are no limits to the number of wilds, scatters, multipliers, free spins, and other double double bonus features these games can offer.

Some of the best video slot games are:

• Gonzo’s Quest
• Immortal Romance
• Thunderstruck II
• Book of Dead
• Cleopatra
• Wheel of Fortune
• Game of Thrones

Jackpot Slots

Several of the top UK online slots are jackpot slots, e.g. Megabucks. These offer the chance to win huge amounts of money on a lucky spin. These prizes are fixed, so you already know how much you can win if you hit the pot.

You will have to trigger a jackpot by landing a specific combination of symbols or playing a bonus game. It isn’t hard to find these games as many slots feature one or more huge jackpot prizes, including slots like:

• Wacky races
• Mustang Gold
• Star Joker
• Wolf Gold
• Crazy Time

Progressive Jackpots

While regular jackpots are fixed, progressives like Playtech’s Green Lantern accumulate by taking a small portion of every amount wagered on a spin. So the prize continues growing as players keep on playing. 

That’s why progressives are called millionaire-makers. These amounts aren’t just huge but life-changing. And the best part is that you don’t have to make the max bet. You can win even with minimum deposits and the smallest stakes.

Microgaming’s Mega Moolah remains the top progressive jackpot slot with a record €18,915,872.81 payout. Other standout progressive slots include:

• Mega Fortune
• Hall of gods
• Major Millions
• Arabian Nights
• Age of the Gods

Fruit Machines

Fruit machines are some of the most common slots in the UK. Their name comes from the fact that most symbols on the reels are fruit icons, alongside bells, 7s, and bar symbols.

They are characterized by a hold and nudge feature. You can hold one or more reels in place while others spin, and you can also nudge a reel with a single move rotation after spinning.

These features help increase your chances to win at slot, and it’s worth noting that fruit machines often come with multiple jackpot prizes.

The top games available in this category are:

• Fruit Fiesta
• Booming 7
• Fruit shop
• Fruits of Neon
• Mega Flip
• Fruit Zen
• Fruit Mania

3D Slots

These online slot games pack a heavy punch as they feature the latest casino UK game technology on the market. From crisp, crystal clear graphics to pop-up animations and blockbuster soundtracks, 3D slots provide a different kind of immersive gameplay – like video slots but with a cinematic level upgrade.

Here are the top 3D slots to play at the moment:

• Jungle Jim El Dorado
• Vikings go to Hell
• EggOMatic
• Flaming Fox
• Finn and the Swirly Spin
• Safar Sam
• Tiger’s Claw

Video Poker

These gaming machines are not quite slots, but they look like them from a distance. They are a cross between landbased casinos’ slot machines and a poker card game – imagine playing poker inside a slot machine. Just like online blackjack, pokies give players the thrill of quality online gambling.

They generally require more strategy than slots and have more detailed gameplay rules. At the same time, poker sites games are largely entertaining and even offer higher payback percentages. For Las Vegas slots fans looking for a bit of a challenge, chances are you’ll have a blast with this online poker gaming machine.

Common video poker variants are:

• Jacks or Better
• Aces & Faces
• Deuces Wild
• Joker Poker
• Bonus Poker

Casino Bonuses and Free Spins on Slots

These days, every online casino site offers welcome bonus offers to new players to make them join the site. You often get one bonus offer per player, but some operators will extend these rewards to the 2nd deposit, 3rd deposit and even 4th deposit. Not to mention continuous ongoing promotions for players who keep coming back. 

Free spins are one such grand ivy casino bonus specific to slots. They allow you to spin the base game reels several times, free of charge. The best online slots UK casinos will offer as many as 200 or more free spins on your first deposit. Some sites will also provide wager free casino offers in the form of no deposit bonuses. The slots casino may offer bonus spins on selected games, or you may be given a free hand to play your preferred titles.

Although this slots bonus is a major player magnet, just like any other casino promos, t & c apply.

Bonus wagering requirements are the most prominent conditions because you have to fulfil them before receiving a payout on your winnings. Consider you receive a bonus of £100 and are subject to 35x wagering the total bonus amount. You would have to bet £3500 to withdraw your winnings. Game weighting applies in cases where you end up with wagering requirements from a welcome bonus.

The wagering requirement can be between 20x and 50x of your free spins winnings, but a 30x wagering bonus or lower is recommended to play responsibly.

You also get the bonus valid for a specific time frame (usually 7 days, otherwise, any unused bonus shall be removed). The bonus funds contribute towards wagering, so the latter is valid until the bonus funds expire.

In addition, you will find other restrictions like a max bonus bet to comply with. At montycasinos.com, we advise players to read the bonus T&C before accepting any welcome offer.

Fairness of Slot Machine Outcomes

Casino online slots like Buffalo Blitz run on a random number generator (RNG) software, which determines game outcomes. The RNG ensures that every spin’s result completely depends on chance.

To verify that bovada casino RNGs work as they are supposed to without any external manipulation, they have to be tested by reliable audit services like eCOGRA. Only the top online licensed sites have a seal of approval from eCOGRA. These top slot casinos are regulated by the UK Gambling Commission and are trustworthy and reliable, so you can also expect fair play from their games. Operators like Paddy Power and Jackpot Village have multiple licenses from the UKGC and the MGA (Malta Gaming Authority).

Online Slots For Smartphones and Tablets

Playing your favourite slot games has never been easier, thanks to the mobile gaming rave in recent years. Game developers and casino operators are taking a mobile-first approach, which has led to the proliferation of mobile casinos, mobile casino games, and live dealer options.

As more games are developed in HTML5 (a coding platform that allows online and mobile accessibility), the top mobile slots play seamlessly on the compact screens of smartphones and tablets.

With Android, iOS, or Windows portable devices, you’ll also be able to download dedicated mobile casino apps directly onto your phone or tablet for even greater convenience.

Best Online Slot Game Manufacturers

Fantastic games have got to have fantastic brains behind them, and the slot industry is teeming with talented and innovative providers, e.g. Red Tiger.

Software provider	Origin	Launch Year	Popular slots
Microgaming	Isle of Man	1994	Mega Moolah, Game of Thrones, Immortal Romance
NetEnt	Sweden	1996	Gonzo’s Quest, Starburst, Mega Fortune
Playtech	Estonia	1999	Age of the Gods, top Gun, Desert Treasure
Novomatic	Austria	1980	Lord of the Ocean, Sizzling Hot, Book of Ra
Play ‘N GO	Sweden	2007	Book of Dead, Mystery Joker, Reactoonz
Yggdrasil	Sweden	2013	Vikings Go Wild, Jokerizer, Holmes and the Stolen Stones
Betsoft	Malta	2006	The Slotfather, Good Girl Bad Girl, Mr. Vegas

Besides slots, these providers also have several table games and live casino products available at the top slots sites UK.

Advantages and Disadvantages of Online Slots Compared to Other Casino Games 

Here are the advantages of online slots compared to other casino games:

• Extensive Variety. Online slots offer players multiple games with unique features. This is a step ahead of other games which have limited gaming availability.
• Minimum Wager Requirements. Slot machines let players access their favourite games with fees as low as $1. On the other hand, some casino games have their lowest bets set at $5 or $10.
• Excellent RTP. Online slots offer RTP rates that go as high as 99%, which means a 1% house edge. However, you can have other casino games that have a house edge as high as 5%. 

Despite all its perks, there are some drawbacks to playing online slots. These include:

• Winning depends on luck.
• Online slots are games of chance and depend largely on luck. On the other hand, you can learn strategies and techniques to win other casino games.

Our Conclusion

Slot machines give you access to premium gambling fun with quality features and multiple plays to win. Moreover, online slots come in different shapes and sizes. While this diversity is its salient point, slot players always look for the most exciting titles. montycasinos.com highlights the best games and the subtleties and details of what makes a top slot.

With slots, one size doesn’t fit all. Whether classic machines, video slots or jackpot games, each offers something different for players to enjoy. You can use this best online slots UK guide to choosing the best game. Once you sign up and make your wager, you’ll be guaranteed to have fun and win money simultaneously. Nonetheless, the best online slots UK share one thing in common – they are loads of fun to play!

Expert’s Opinion

From my years of experience in the online casino industry, I can confidently say that it’s hard to beat the thrill of slot gameplay. It’s ironic since slots have the most basic rules out of all online casino games. Our expert casino reviews are based on an in-depth analysis of multiple gambling features. These include the game variety, types of bonuses, payout options and moneybookers, e.g. Skrill, Avalanche, Paypal, and Neteller.

However, they are good, especially when you play with a free spins bonus at the top-rated online slot sites. Like with real money slots in the united states, I get a kick out of trying out free games. The best things in life are free, including the best slot experiences.

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