Free slot machines with bonus rounds to play online for free

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All of the recommended operators above are fully licensed to operate in the UK and are endorsed by independent organisations that verify their safety, such as eCOGRA and IBAS. We have also made sure that all of our suggestions benefit from top-notch security and player protection measures. Apart from that, we have taken into account the welcome offers provided to new players and how diverse and high-quality the gaming libraries are. You can read more casino reviews on our site to find the perfect fit for you.

The Best Free Slots with Bonus Games for UK Players

In this review, we will delve deeper into some of the top free slot games with bonus rounds developed by leading software providers such as NetEnt, Microgaming, Playtech, etc. You will be able to learn about the rules, how to trigger the special features, what kind of prizes you could expect and many other interesting details. To make it easier for you to navigate through the guide, we have created a table of contents where you can find all the sections listed out conveniently.

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There are many reasons why play free slots with bonus games are so beloved among gamblers – they are easy and fun to play while still giving you a chance to score significant payouts. Read on to find the best titles available online and valuable info regarding the main characteristics of slot machines with an additional bonus game!

Top 10 List of the Most Popular Free Slot Machine Games with Bonus Rounds

We have handpicked those specific games because they represent different categories and have proven to be loved by UK players for years. They offer various bonus stages, fantastic graphics, and excellent return to player rates. On top of that, these free slots with bonus games online give out massive wins regularly.

While most of them are available at the best UK online casinos, we have also included some classic titles that cannot be found at betting sites anymore but are still dear to slot lovers. Even though they cannot be played for real money nowadays, they are still great choices when playing for fun. If you want to know more about each of the games, continue reading below, where we have gone into detail for each one.

Mega Moolah (Win up to £209,843)

Mega Moolah is a safari-themed slot machine powered by . It has been captivating players since its release back in 2006 thanks to the thrilling gameplay, colourful design and most importantly, the mind-blowing jackpot network. There are four progressive jackpots – the Red one gives the smallest payout, while the Blue, the Silver, and the Gold reward you with hundreds of thousands, and even millions of coins!

The bonus round, called the Mega Moolah Bonus, is triggered when you get 3 Wheel of Fortune symbols and 1 Bonus symbol on the first three reels and the Bonus symbol on the fifth reel simultaneously. Once you hit the magical triangle, you will see a wheel similar to the one Pat Bertachini used to land big payouts on the American shows. Spin the wheel and cross your fingers! This free slot machine with a bonus game is advertised from the UK as a medium variance game with a 94% RTP, and it allows bets between 1p and £5.

Thinking of Mega Moolah’s maximum win, we are hopelessly missing two digits! That’s right; the slot has previously awarded £198,758 dot euro, which converted to GBP makes £209,843.41.*_* It is not a typo; you read it correctly – that is the fourth biggest ever won and the biggest Microgaming jackpot of all time! Not long ago, in June 2021, another lucky player scored over £18 million from a £1 spin on another version of the game –

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Cleopatra (Win up to £25,000)

Cleopatra is one of the most popular slot machines with a bonus game and free spins, both available to play in any town or city in the UK, or online. Released by in 2010, the slot quickly became a favourite due to its Egyptian theme, capturing graphics and soothing soundtrack. The iconic layout features a 5×3 grid with 20 adjustable paylines.

The scatter symbol is the Sphinx. Landing at least two of those will multiply your total bet instantly. Finding at least three will open the famous Cleopatra bonus game, also known as the Cleopatra scatter bonus. You will be transported to a new screen where 180 extra spins are waiting for you. The best thing is that all winnings are triple stacked! That means you have a reasonable chance of winning up to 180x your entire stake. With a little bit of luck, you could score the legendary 165,000 max win and take home up to £25,000,** even when playing on the worst betting sites in the UK.

Together with Cleopatra, is responsible for another top-rated game with bonus free spins – the long-awaited sequel . The highly anticipated title was officially released in 2018 and boasts breathtaking graphics, awesome animations and multiple innovative features. The most intriguing option is the ‘’Vault’’ feature, hiding multipliers up to 5x and mega Symbols covering the whole reel. You should definitely try it out if you haven’t yet! Other titles worth mentioning include and Hall of Gods. Both have already produced dozens of mega slot winners and are available at the top online casinos in the United Kingdom.

Gonzo’s Quest (Win up to £75)

Powered by , Gonzo’s Quest is another video slot machine with an exciting bonus round and free spins that every self-respecting British gambler must have tried at some point. The adventure begins as soon as you launch the game, following the steps of the brave Gonzalo Pizzaro on his quest to find the lost city of gold – Eldorado. The beautifully designed stones of the waterfall serve as the reel-spinning stage. Yet, unlike any other slot machine, here they do not simply animate – they topple down, leaving space for a new set of symbols tumble down from above.

This mechanism is called Avalanche and is central to the gameplay. Each consecutive win increases the win multiplier by one until it reaches a maximum of x5. Getting multiple tumbling wins in a row without re-spin can award up to £75. Apart from that, there is a free fall symbol which turns regular symbols into wilds and transforms losing spins into winning ones. Three or more of the Boss Stone Bonus symbols anywhere on the reels will activate the Free Fall bonus round, where you win ten free falls and a 15x win multiplier. This top-rated slot with a bonus game allows bets between 25p and £50 per spin and promises an RTP of 95.97%.

If you like Gonzo’s Quest, you might also enjoy its sequel – . Developed by , the game features the same Avalanche multipliers but adds some new unique characteristics like the Ever Win feature, which converts the lowest symbol in a winning combination into an ever win for that spin. Another innovative trait is the Blazing Trails feature, increasing the win multiplier by one after every tumbling win. The highest you can climb is El Castador (5x multiplier), Gonzo (4x multiplier), Senorita (3x multiplier), and Juan (2x multiplier).

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Starburst (Starburst XXL) (Win up to £50,000)

Developed by , Starburst is a timeless masterpiece that takes you on an interstellar journey across the universe. With just one spinning reel and one payline, it is probably the simplest slot machine with a bonus game that exists. But don’t let that fool you! Every time a starburst symbol lands on reels 2, 3, and 4, it expands to fill the entire reel and trigger a free re-spin. During the re-spins, more starburst symbols might appear, bringing you closer to the impressive max win of £50,000!

In case you get frustrated with the small winnings, we suggest increasing your bet – Starburst allows spins between £0.10 and £200. Many consider this game one of the most successful Neoteric slots and the reason behind NETENT’S success. We tend to agree, but in our opinion, the true secret to Starburst’s popularity is the perfect balance between simplicity and potential rewards. Some may call it low variance, but we prefer to think of it as consistent. So, next time you are hunting for the best online slot machines bonus, keep your eye for this cosmic gem!

Still craving more shining gems, wild stars, and mesmerising sound effects? Then you should definitely try ! Powered by , the sequel promises an RTP of 98.30% in both free and real money mode. What is the catch? Well, instead of expanding to a whole reel, the starburst symbols now grow up to three neighbouring reels. In addition to that, NOLIMIT CITY has added a new Wild Creep feature that reminds us of the Gladiator Road to Riches bonus game. Essentially, it moves wilds up the row with every tumbling re-spin until they reach reel 5 and remain stuck for one normal spin.

Thunderstruck II (Win up to £2,400)

Thunderstruck II is a five-reel free slot machine with bonus games and free spins from the prominent software provider . It is a direct sequel to the legendary Thunderstruck, whose greatest achievement is putting micro gaming on the map back in 2004. Thor’s brother Odin is the one taking eight Norse gods on an epic adventure filled with incredible challenges, Wild Great Hall Of Spins Features, and huge payouts.

Each consecutive win at Thunderstruck II activates the Gamble feature, allowing you to double or quadruple your prize by correctly predicting the suit or colour of a random card. The Great Hall of Spins bonus game is triggered when you get 5 Valkyrie symbols. At first, this particular achievement will unlock the Giant bonus stage for a few spins. As you progress and accumulate more hours of gameplay, the other four features become accessible – The Warrior for moderate advances, The Amazon for mediocre, Valkyrie for bigger wins, and The Wild Magic feature, which mixes up all the others and brings unpredictability to the table. Thunderstruck II offers a lot of action and the opportunity to score up to £2,400. With bets starting from £0.01 and reaching up to £125, this high variance free slot machine is suitable for UK players with varying bankrolls.

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Speaking of high variance, Thunderstruck II’s predecessor Thunderstruck should not be underrated either! It also belongs to the group of , offering hefty payouts and exciting gameplay. Despite the lack of the Great Hall of Spins bonus, the game features 243 ways to win and a max bonus of £10,000, which is nothing short of amazing! Both slots are widely available at the . If you’ve had enough of Norse mythology, we recommend trying or Tomb Raider. Both games offer exceptional bonus stages and can be found at almost every single casino in Wales, Scotland, England, and Northern Ireland.

Dead or Alive (Win up to £546)

Dead or Alive is a top-rated Western-themed free slot with bonus games, brought to us by … What?! How is this possible? From quick Google searches to Hollywood blockbusters – NetEnt seems to dominate the market with outstanding products. Nevertheless, here we are talking about yet another superb slot machine developed by… . Go figure! Be that as it may, once you hit the spin button, you will notice elements of top-quality software and innovative ideas that can only mean one thing – .

Anyways, getting back on track, Dead or Alive’s layout is pretty standard – 5 reels and 9 paylines. The story takes place in the Old West, where wanted bandits turn wild during the free spins bonus round and bring you closer to the magnificent max win of £546 per line. One thing that sets this game apart from the competition is the high volatility. That means you won’t be seeing a lot of small winnings, but when the bonus stage hits, you will be showered with prizes! If you think that sounds good, then wait till you hear that Dead or Alive allows bets as low as £0.09!

Are you ready to explore the mesmerising world of NetEnt and their incredible creations? Start off with (Win up to £500) and (Win up to £250), and work your way up to the legendary (Win up to £400,000). If you are hungry for massive jackpots, Hall of Gods and Mega Fortune Dreams are not enough – go straight for the throne! Just remember that these games are incredibly popular amongst slots enthusiasts in England, Scotland, Wales, and Northern Ireland, meaning their RTP might be lower due to the massive jackpots.

Hot as Hades (Win up to £5800)

Hot as Hades is a humoristic take on the Greek mythology, developed by . You will follow the evil plans of the titular character as he tries to throw the world back into eternal darkness. Fortunately for the rest of humankind, an array of bonus features will help you keep Hades behind bars and score sweet prizes simultaneously.

The Serpent’s Strike Wilds show up randomly on the reels, turning one or more reels completely wild. Super Mode is activated when you manage to land the special symbol on reels 1 and 5. Depending on where exactly it appears, you will trigger one of four different Super Modes – Expanding Wilds, Spreading Wilds, Wild Reels, and 10 Free Spins. Each of those has its own advantages and helps you edge closer to the maximum win of £5800. Considering the medium variance of the slot, you will be activating Super Modes quite often, locking in spins at just 25p per spin.

If you liked Hot as Hades, then we have great news! MICIGAMING has tons of other masterpieces that could grab your attention. Our personal favourites include :

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Each game boasts unique characters, captivating music, and one-of-a-kind gameplay mechanics. Plus, they can easily be found at the best online for UK citizens. Check them out and broaden your horizons!

Twin Spin (Win up to £5800)

NetEnt seemed to have struck gold with their Twin Spin series. First came out in 2013, followed by Twin Spin Turbo in 2017, and later – in 2020. All three slots offer a unique experience, but share common features such as high volatility, stunning visual and audio effects, and the signature Twin Spin mechanic. Basically, every round starts with two to five adjacent reels locked with the same symbols. If you are lucky enough, they could turn into a full screen, awarding the maximum win of £5800.

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Despite its age, Twin Spin remains one of the most loved in the UK. You can test its waters by playing for free or dive headfirst into the action with bets reaching up to £150 per spin. An even more recent creation is – it was launched in November 2020. Compared to the original, Twin Spin Turbo features a more modern design with a neon-lit New York Cityscape in the background and 96.47% RTP. The biggest difference comes in the form of the Turbo Majors – 10 symbols of the same kind on the reels, awarding payouts up to 1000x your stake. Finally, Twin Spin Megaways is the most recent member of the family, developed by Silverbullet games and featuring 6 reels with up to 117,649 Megaways to win. Judging by the title, you probably guessed that Tigerspin Megaways offers super stretchable reels and Mega twin features, which merge close to each spin to cover even more ground.

Immortal Romance (Win up to £3,640)

Even if you are not into rock music, you have probably heard of System of a Down lead singer Serj Tankian and his passion for online gambling and slot machines, in particular. Little did we know that in 2011, his voice would become the gateway to the Immortal Romance slot machine, perhaps the best micro gaming vampire-themed game of all times. The 5 reels and 243 paylines layout is filled with intriguing symbols and animated scenes, telling the stories of five characters – Amber, Troy, Michael, Sarah, and Victor. Each of them unlocks unique features that will keep you entertained for hours.

Landing 3 or more Scatter symbols anywhere on the reels will trigger the Wheel of Wishes Bonus Feature, which offers four possible free spin modes. The greatest number of free spins can be obtained via the Michael bonus stage – 20 times your bet, plus vibrating waves wild desktop wallpaper that move one step with every free spin. Alternatively, you could aim for the Sacha Bonus Multiplier within the Amber feature, which starts at 5x and increases by one with every free spin during the bonus round. With a minimum bet of just 30p per spin, Immortal Romance promises a max win of £3,640 and thrilling gameplay.

Do you like vampires? Are you curious what werewolves, Frankenstein’s monsters, mummies, and other horror creatures can bring to the table? You will find plenty of options at the ! Take as an example (Win up to £1500). Based on Mary Shelley’s novel and featuring 9 paylines on a 5×3 grid, the slot promises frequent winnings and creative gameplay. On the other hand, (Win up to £250) is all about free spins and the Book of Dead bonus stage. Inspired by ancient Egyptian culture, the game boasts 9 adjustable paylines and a max exposure feature, which expands any symbol to cover the entire reel.

Avalon II (Win up to £240)

is the second instalment of the camelot-inspired series created by MICIGAMING. It improves upon almost every aspect of its predecessor whilst keeping the core mechanics intact. Like before, the slot is all about the free spins bonus stage and the possibility of entering five different game worlds, each offering unique benefits. Here is a quick overview:

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Once the free spins are over, you will be sent back to the original game world with the highest multiplier. Getting there requires some serious dedication and big bankroll since you need to collect special treasures on the left side of the screen. Each one unlocks 15 new free spins. Thankfully, MICIGAMING lowered the bet limit significantly compared to the original Avalon. Now you can go on a quest for glory with just 50p per spin, capping at £100. Those willing to test it in real money mode can find Avalon II at almost every casino in Wales, Scotland, England, and Northern Ireland.

Feeling the urge to draw Excalibur and claim your destiny? Wait until you hear about the other Avalon slot machine – ! With a stunning 80 paylines on a 5×3 grid, this game allows bets between 75p and £150 per spin and promises an astounding 290,000 max win. Oh, and let’s not forget about the mystical Isle of Avalon bonus stage, transporting you directly to the Free Spins mode.

Bonus Games and Special Features

We hope you enjoyed our selection of the top free slot machines with bonus games and free spins. It is time to switch gears and look into the bigger picture. Namely, what are the benefits of playing such games and is there a difference between demo and real money mode? Let’s find out!

For starters, most of the slots mentioned above are characterised by medium to high variance, meaning you will have long periods of small winnings or no results at all before hitting the big bonus stage. That is perfectly fine and actually preferred by many British players who love the thrill of chasing the big win. Still, you must be aware of the bankroll required and adjust the bet size accordingly. For instance, some of the might be suitable options for low stakes players.

That said, the highest payouts are almost always linked to the bonus stages. You could spend hours playing and end up getting only a few pennies. And suddenly, just a few spins later, the bonus game kicks in, and you leave with hundreds, if not thousands of pounds. It all depends on luck, but having a proper budget and a clear strategy certainly does not hurt.

Free spins are another characteristic of most bonus stages. They usually come in bundles alongside various other perks like win multipliers, stacked wilds, symbol transformations, and much more. In a nutshell, the top free slots with bonus games provide an immersive experience filled with thrills and big payout opportunities.

Final Thoughts

Well, there you have it – our comprehensive review of the top free slot games with bonus features. We explored ten of the best titles, diving deep into their mechanics, payouts, and characteristics. Almost all of them are filled with free spins and innovative gameplay mechanisms that will keep you hooked for hours.

But that is not all! Throughout the article, we also dropped names like Mega Moolah and Hall of Gods, opening the doors to an entirely new world of . Do not hesitate to check it out and find out more about the biggest online jackpots in history and the slots that distribute them.

As usual, we remind our readers to play responsibly and use the remaining sections of the review to navigate towards useful tools like the list of the best free slots with bonus games and the informative FAQ section. Enjoy!

FAQ

In the final section of our free slot machines with bonus games guide, we intend to answer the most commonly asked questions around the web. Although every title features unique gameplay and specific requirements, certain queries apply to the majority of bonus slots. Therefore, we encourage all British players to stick around and broaden their horizons.

🎰 Where can I play free slots with bonus games?

Finding the perfect slot with a bonus game should not be difficult. In fact, most of the described in this article are available for free and real money at numerous UK online casinos. However, picking the right platform can be tricky, considering the vast variety on the market. Therefore, we intend to help by providing a list of the top venues for free spin aficionados in the near future.

💰 What are the most paid out online slot machines?

Many factors contribute to a player's decision on where to put his hard-earned cash. Nevertheless, the return to player (RTP) percentage is considered the ultimate indicator of a slot's quality. Even though most bonus slots boast medium to high variance, several titles from our free slots with bonus games list offer remarkable RTP. Mega Joker (99%) and Book of Dead (96.21%) are just a couple of examples.

🏆 Which is the best online slot machine with a bonus game?

Picking the most outstanding free slot machine with a bonus game from our list feels like attempting to measure the ocean's bottom. Each game offers something unique – exquisite graphics, thrilling soundtracks, lucrative bonus stages, and many more. Before making your choice, you must determine what factors matter the most to you. After all, chasing the big win is not everyone's cup of tea.

📱 Can I play online slots with bonus games on mobile devices?

Absolutely! Whether an iOS or Android user, a dedicated or a mobile browser player, you can access all bonus slots described in this review on the go. Actually, many software studios and online casinos prioritise the optimisation of their mobile platforms nowadays. Therefore, you can play Mega Joker, Mega Moolah, Gonzo's Quest, and every other game without sacrificing any of the initial features and functionalities.

🎁 Which slot machine has the most bonuses?

Without a doubt, Mega Moolah is the slot machine with the most substantial bonus stage of all time. Also known as the Big Win Cat, this progressive video slot promises thrilling African Safari adventures and life-changing prizes. Spin the vivid reels, and you might earn free spins and the randomly triggered Bonus Round, taking you to the Wheel of Fortune. From there on, you can choose one of four jackpots – Megaways, Minor, Major, or Mega.

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Let us conclude this review by presenting you with the top 10 ratings list of the . These online casinos stand out from their competitors with well-optimised websites compatible with all sorts of smartphones and tablets. That is why you can play your favourite free slot machine games whenever the mood strikes you and receive worthy bonuses along the way.

In addition to that, each venue enjoys the trust of the UKGC, NECC, and BeGambleAware.org. Their certificates are your guarantee that the operator treats transparency, responsible gambling, and data encryption as top priorities. Furthermore, you will be amazed by the abundance of popular slot machine variants by the finest providers, tournaments, and exclusive promotions.

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