Slots with Bonus Games – Best Bonus Slots in 2025

Slot machines have been part of the classic casino game experience for well over a century, but modern online slots have been redefining the genre with exciting bonus rounds and features. If you want to play with the top slot bonuses, then you can start with 2025‘s list of the best online slots with bonus games available to UK players:

This guide will go over all the important details of the best slots with bonus games. You will learn how to trigger each feature and how to play it properly. Getting to these best bonus slots offers is sometimes difficult, but the great rewards and fun gameplay make it worth the trouble. Most online casinos offer many slots with a games bonus, so they aren’t difficult to find, but our guide will show you the best slot sites to win at the following incredible titles.

List of the Top 10 Slot Machines with Bonus Games

• 🥇 Finn and the Swirly Spin (Best Free Spins Bonus Game)
• 🥈 Avalon 2 (Top Bonus Round Variety in the UK)
• 🥉 Immortal Romance (Unique Chamber of Spins Game)
• 🏅 Game of Thrones (Amazing Slot Gamble Feature)
• 🏅 Starburst (Exciting United Kingdom Slot Game)
• 🏅 Merlin’s Millions (Great Owl Bonus Feature)
• 🏅 Frankie Dettori’s Magic Seven (Best British Slot Machine)
• 🏅 Jack Hammer (Win 1000x Your Stake)
• 🏅 Dead or Alive (Best Sticky Wilds Feature)
• 🏅 Gonzo’s Quest (Immersive UK Bonus Game)

Finn and the Swirly Spin (Free Spins World) – From NetEnt

Enter a magical world and draw upon the luck of the Irish with Finn and the Swirly Spin. It is on the top of our best slots bonus list for a good reason, as the game is brimming with unique features and fun gameplay. The game also has low volatility, so you’ll get to enjoy its bonus features frequently and can relax with the soothing soundtrack. Once you start the game, you will know what is the best time to play slot machines.

NetEnt has outdone itself by providing fantastic bonus features, such as the innovative swirly reel. Symbols move in a swirly pattern towards the centre, creating wilds whenever they match. If you can get the special key symbol to the end, you can enter a magical world of free spins. Collect more keys to unlock better UK slot bonuses and win up to 500x your stake while playing.

Aside from the free spins, you can encounter bonus features during regular play too. For example, Magic Transform turns regular symbols into higher-value ones. This game is among the top slots with a games bonus feature.

Avalon 2 (Holy Grail Bonus) – From Microgaming

Join King Arthur on his legendary quest to find the Holy Grail in the Avalon 2 slot game. This incredible sequel game features 243 ways to win and an abundance of bonus features. The core gameplay is standard, with five reels and three rows, but it has some of the best slot bonus games, despite the lack of progressive jackpots.

Getting three Holy Grail scatters will trigger the Holy Grail bonus and send you on a quest with eight different mini-online casino games. Each game has different gameplay, from rolling dice in Lake of Legends to fighting the Black Knight at the Hall of Shadows. Every time you land the three scatters, you advance to a new level until you reach the Isle of Avalon for a Wheel of Fortune game and a reward of up to £120,000.

During regular gameplay, you can rely on Merlin to work his magic and randomly reward you if you don’t win or multiply your existing prize. Enjoy stunning animations with one of the best bonus slots.

Immortal Romance (Chamber of Spins) – From Microgaming

Uncover the dark mysteries of the vampires in the Immortal Romance slot. Much like a vampire, it might appear to be a normal slot with 243 ways to win, but those who unlock the Chamber of Spins will find a rewarding secret. Wild Desire can randomly fill up to five reels with wild symbols for huge wins during normal gameplay.

Getting three or more scatter symbols unlocks the Chamber of Spins, which can be retriggered as you play it. Much like Microgaming’s Avalon 2, or some of the Play’n GO slots the more times you trigger the bonus, the better your prize. Each of the four characters has different abilities, such as rolling reels or multipliers to win up to 12,000x your stake.

What makes this game popular among the best Microgaming online slot games with bonus, is its storyline. As you play, you’ll encounter beautiful animations telling an engaging and intricate storyline about each character. Combined with the stunning vocal soundtrack, you will find a truly unforgettable experience with one of the best bonus games among slots.

Game of Thrones (Free Spins) – From Microgaming

Choose your allies carefully and win up to £121,000 with the wonderful Game of Thrones slot. Microgaming brings yet another classic to the list of the top online slot games with a bonus. Enjoy the stylish theme of this 243-ways-to-win slot from the house banner symbols to the glorious theme song.

The Iron Throne is your scatter symbol, and landing three of it triggers the free spins selection. You then choose a house, each with its bonuses. For example, Stark has 14 free spins, a 3x multiplier and five stacks of Stark symbols. Use the bonuses to lead your horse to victory and claim the throne. These free spins can be retriggered with three scatters.

For more thrills, you can try the Gamble feature. Bet on a coin flip and win extra rewards if you guess right. There are four stages, each bringing bigger rewards. These features help the game become one of the best online slots with bonus games. If you love such types of slots, you’d better check the top Yggdrasil slots too, as they also have very attractive features.

Starburst (Starburst Wilds) – From NetEnt

Enjoy the colourful symbols and big prizes in Netent’s Starburst slot. This low volatility slot has only one bonus game, but the small and frequent rewards make it extremely useful. With ten pay lines and a great techno soundtrack, you can expect one of the best slot bonus game experiences.

Starburst Wilds triggers whenever a wild symbol lands on reels 2, 3 or 4. It will then cover the entire reel and create winning combinations. After that, the reels will re-spin once with the wilds locked in place for a chance at more prizes. This feature can net you a reward of up to 500x your stake.

Another helpful feature is the “both ways” mechanic. This mechanic means that winning combinations are counted not just from left to right, but from right to left as well, so you will have twice the chance to win. This game is one of the bonus slots that is best suited for beginners or low-rollers. Despite being released a decade ago, Starburst is still a player favourite even at the best new slot sites in the UK.

Merlin’s Millions (Owl Bonus) – From NextGen

Help Merlin research new spells and earn prizes in the great Merlin’s Millions slot. It has five reels and 50 pay lines, and you can win some big wins, should you strike it lucky. Big bonus slots such as this one have feature rounds with a Superbet. This feature allows you to add a multiplier to the wild symbols for bigger rewards.

NextGen has created two of the best slot bonus games. The first appears when you get three orb scatters. These orbs activate five free spins, where Merlin can randomly turn entire reels into stacks of wilds. Gathering three Owl Scatters will instead fill the reels with owl symbols. You can collect rewards until the “COLLECT” symbol appears.

Merlin’s book can get you up to 1000x your stake for a truly astounding reward. The great sound effects and fluid animations add a fun character to this game, making it incredibly satisfying when you win. Whether you’re a high or low roller, this game is enjoyable for everyone and we love it as much as Rainbow Riches.

Frankie Dettori’s Magic Seven (Magic Seven Bonus) – From Playtech

Relive the excitement of Ascot 1996 with one of the best bonus slots online: Frankie Dettori’s Magic Seven slot. With 25 pay lines and a maximum payout of 194.425x your stake, this is an outstanding game among video slots with bonus rounds. If you are after games with frequent payouts, then check out the best Megaways slots in the UK.

You can find two fantastic bonuses when you play this game developed by Playtech. The first appears when you land three scatter symbols of the logo. You then pick a horse and win up to 35 free spins if your choice wins the race. The second feature is the Magic Seven Bonus. Landing two ‘BONUS’ scatters will bring you to a racetrack where you pick tiles and reveal rewards. This game continues until you get the ‘Collect’ symbol.

What makes Frankie Dettori’s Magic Seven stand out from other bonus feature slots is the wonderful theme. During bonus rounds, you will be able to see clips from Frankie’s race at Ascot, and the upbeat music will help you feel like a real winner. Have fun with this thrilling race by playing the game at the UK’s best payout online casino sites.

Jack Hammer (Sticky Wins) – From NetEnt

Help the colourful detective stop the mad scientist in Jack Hammer. This 25-payline slot has a unique comic book style and atmospheric sounds, creating an immersive game among other online slots with bonus rounds. It is one of the top picks in the NetEnt slots list.

NetEnt is known for its excellent bonus game slots, and this one has two exciting features. Getting five or more free spins symbols can get you up to 30 free spins. Alternatively, every time you score a win, the reels will re-spin for a chance at more prizes, with the winning combination sticking in place. This feature continues until you stop landing wins. You can win up to 1000x your stake with five detective symbols.

As this slot’s volatility is low, you can expect to win small but frequent prizes. The low volatility also means you will encounter the bonus games more frequently, so even low rollers can enjoy them. Experience fun mechanics and a great story, with this fun and casual slot suitable for everyone.

Dead or Alive (Sticky Wilds) – From NetEnt

Journey to the Wild West with the marvellous Dead or Alive slot. Although this is not an Egyptian slot machine, this is one of the more difficult UK slots with bonus rounds as the volatility is very high. It even deserves a place in the list of the best high-variance slot tiles for UK players. However, the reward of 2,500x your stake for a nine-pay line slot is excellent and makes the game one of the top cartoon slots.

There are only two features in this slot, compared to other slot machines with bonus games. First are the free spins. When you get three or more scatter symbols, you trigger 12 free spins, and can even retrigger them once. During free spins, you can benefit from sticky wilds.

Sticky Wilds are the Wanted poster symbols, and they stick only in the free spins round. Getting one or more will not only substitute for regular symbols and have them remain until the end but will also trigger five more free spins. As such, while it can be challenging to land rewards, once you get a lucky streak, you can earn enormous rewards.

Gonzo’s Quest (Free Fall) – From NetEnt

We finish our list with a quest for the golden city of Eldorado in Gonzo’s Quest. In this unique game, colourful blocks fall from the sky and fill the reels, exploding whenever you win. The biggest payout you can get is 2,500x your stake with the blue blocks.

Your first bonus feature is the Avalanche feature. This mechanic causes all winning blocks to explode, and new ones will fall in their place for a chance to create more wins. Each consecutive avalanche also increases the multiplier in the top right corner so that you can get a true cascade of rewards with enough luck.

Finally, if you land three gold scatters, the door will open, and Gonzo will walk into the city of Eldorado. This Free Fall feature acts as free spins, and you get 10 spins for each bet line containing three scatters. Combined with the multipliers and avalanche feature, you can expect some outstanding prizes and fun animations. Meanwhile, you if like anime slot games, you can check our dedicated page and pick the ones you like.

Types of Bonus Slots Features

The best bonus rounds come in a variety of interesting types. Each one offers innovative gameplay and fun challenges to help spice up an already thrilling slot. Below you can find the most popular types used in the best bonus slots and what makes them a favourite staple among players.

• Free Spins ⮞ During Free Spins bonus rounds, typically a player will be awarded free spins, which can be determined based on the number of bonus symbols that appear on the reels, or sometimes you can spin a wheel to see how many free spins you have won
• Wheel-Based ⮞ A wheel-based bonus in a slot game is a type of bonus feature that resembles a spinning wheel, much like you’d see on game shows like “Wheel of Fortune.” When triggered, players get to spin this wheel to win various prizes, sometimes including additional free spins
• Click Me Feature ⮞ A “Click Me” feature in a slot game is a popular type of interactive bonus that players can trigger during gameplay. This feature is sometimes called a “Pick Me” bonus. It involves selecting from various symbols on the screen to reveal hidden prizes.
• Arcade Games ⮞ Interactive Minigames are special bonus rounds styled like traditional arcade games. These features offer a break from the standard slot reel spinning and provide more interactive gameplay, generally offering bigger wins.
• Sticky Wilds ⮞ These are special types of wild symbols that, when they appear on the reels, stay in place for multiple spins, rather than disappearing after just one spin. Hitting a full screen of sticky wilds generally means you’ve hit a jackpot
• Transforming Symbols ⮞ This feature in slot games is a dynamic mechanic where certain symbols randomly change into wilds, significantly enhancing potential wins. This transformation can occur in various ways, often triggered by specific combinations or completely at random
• Gamble Feature ⮞ The Gamble Feature in slot games offers players an exciting, optional risk vs reward opportunity to either double their winnings or lose them entirely. Typically triggered after a winning spin, this feature presents a simple 50/50 choice to double up and bust
• Cascade Reels ⮞ This feature in slot games enhances winning opportunities by removing symbols from winning combinations and replacing them with new ones that tumble down. This process can create additional wins from a single spin, continuing until no more winning combinations form, making each spin potentially more rewarding
• Re-Trigger Free Spins ⮞ The “re-trigger free spins” feature in slot games allows players to extend their free spins round by landing additional special symbols, typically scatter symbols, during the free spins. This can significantly increase the duration of gameplay without additional bets and boost the potential for bigger wins
• Random Rewards ⮞ In slot games featuring a “Random Prize” feature, players can win prizes spontaneously, without the need for specific symbol combinations or triggers. This adds an element of surprise and excitement, as a win could occur at any moment during gameplay

How to Find the Best Slots with Bonus Games

With countless options available, identifying games with the most rewarding and engaging bonuses can be tricky, as people tend to have different tastes and preferences. Now you’re familiar with the types of best bonus slots online, the next step is finding the slots that not only provide these exciting options but also fit your gaming style. Here’s some useful tips on how to find the perfect slot for you:

• Read Reviews or Watch Videos ⮞ Check out reviews or watch gameplay videos on platforms like YouTube. This can give you a real sense of the bonus games and their mechanics.
• Use the Casinos “Play Mode” feature ⮞ Most casinos nowadays allow their customers to play of slots in a play mode. This means you can play on the slot without wagering your own cash. This way, you can get a feel of the gameplay and make an informed decision if you would like to play with real funds.
• Look for games with several different bonus options ⮞ Within online slots, there are so many different types of bonus games and features. We advise you to test the slots and pick ones with bonus features that suit your preferences.
• Check the Payout Table ⮞ Always review the payout table for potential wins. It gives you an idea of what the bonus games might yield in terms of rewards.
• Choose Your Favorite Theme ⮞ Select a slot that not only offers exciting bonuses but also appeals to you thematically. Whether you enjoy adventure, fantasy, sports, or any other genre, picking a theme you love can make the experience more enjoyable.

The Hottest New Online Slot Bonus Features of 2025

If you are looking for the best slots with bonus games, with game-changing features, this section is for you. As you may have noticed throughout your gambling journey, the online casino industry and slot machines with bonus games constantly evolve. Several kinds of reel machines have popped up and each one stands out with a particular mechanic or feature that makes them instant crowd-pleasers among British players. Here are they:

• Megaways Slots
• Megapays Slots
• Slots with Nudges
• Bonus Buy Slots
• Progressive Jackpot Slots
• Jackpot Slots
• Low Variance Slots
• Medium Variance Slots
• High Variance Slots

Each of these types of online slot games is designed to elevate your experience and spice things up a bit. For instance, the “Nudge” feature allows Brits to shift the position of a given reel for several positions and thus change the outcome from the spin, potentially in your favour. If we look at another example, the bonus buy slots come with a unique feature on their own.

For a premium fee, you can gain instant access to the free spins bonus round or a similar feature and instantly increase your chances of scoring a jackpot. You can have a lot of fun with either of these bonus slots perks. Some pave the way for easier gameplay, while others make it more effortless for you to pinpoint the exact type of reel machine that’s most suited for your needs.

UK’s Best Slots Bonus Deals Available in May 2025

Some British players already know it, while others have not realised it. Either way, we must tell you that UK slots go hand in hand with the various welcome bonuses, offered at our recommended picks. Newbies are unaware, but reel machines contribute the most towards any promotion wagering. If you dig this gambling product, you will get the best chances to unlock your bonus amount and claim the juicy reward.

Each UK casino site listed above is proven to be among the most trustworthy operators and such that come with loads of reel machines with features, such as progressive jackpots, extra wild symbols, and random wilds, all of which can potentially bring you real money cash rewards.If you’d like to know more, check out our rundown of the slots with the best payouts.

Keep in mind that the sign-up offers are not the only chances to opt-in for an offer. Most venues regularly host game nights, tournaments, and other one-time promotions tailored for fans of the UK slots, so keep an eye out.

Frequently Asked Questions From UK Readers

In this short section, we will answer all your pressing questions regarding online slots with bonus games. There are many questions concerning UK players, so we will provide extra information, such as how to trigger the bonuses. Enjoy these fun slots to the fullest without worrying about any unknown details.