13 Best Slot Machines to Play: The List You Need

13 Best Slot Machines With Buy In Features

14 min

Are you itching to know what’s the best slot machine to play? Look no further! Welcome to our expert guide where we unveil the top picks for thrilling slot gameplay. Get ready to dive into the world of online slots and discover exciting ways to trigger bonus features while maximizing your returns.

Top slot machines to play for bonus rounds

Rank Slot Name Provider RTP
1 Book of Ra Classic Novomatic 92.13%
2 Starburst NetEnt 96.09%
3 Irish Riches Blueprint Gaming 95.93%
4 Gonzo’s Gold NetEnt 96.11%
5 Madame Destiny Pragmatic Play 96.56%
6 Sizzling Bells Wazdan 96.2%
7 Sweet Bonanza Pragmatic Play 96.51%
8 Shining Crown EGT 96.37%
9 The Price is Right IGT 94.78%
10 Wild Wild West NetEnt 96.7%
11 Break da Bank Again Microgaming 95.43%
12 Rainbow Riches Barcrest 94 – 98%
13 Midas Golden Touch Thunderkick 96.1%

Book of Ra Classic

Book of Ra Classic

Book of Ra is arguably among the most popular games designed by Novomatic. It is a relatively common game in land-based casinos. Even though it only features 9 pay lines, the gameplay is excellent, and it integrates a free spins’ feature beautifully.

There are tens, maybe hundreds, of Egyptian-themed slots, but in our opinion, Book of Ra steals the show. The 5-reel game’s storyline follows the journey of an explorer for the elusive Book of Ra. Uncover the hidden significance of the ancient pyramids and get paid up to 5000x your stake.

Scroll through the best Novomatic casinos to find the ideal site that comes with a wide range of titles from this software provider.

Free spins bonus round

Book of Ra Classic comes with a free spins feature. The special symbol is the golden book, and landing at least 3 of them anywhere will trigger the bonus round. The game will select a regular symbol to become an expanding wild, to potentially spectacular payouts.

What’s the free spins feature?

Free spins features provide you with a set number of spins upon landing 3 or more special symbols. Often, they combine with special wilds or pick-a-bonus. Look for slots in which the feature can be retriggered within the bonus round. Book of Ra is a prime example.

Unfortunately, some casino sites don’t feature this classic. Don’t worry, though. You’ll find newer games with a similar theme:

  • Book of Dead
  • Rise of Ra
  • Book of Ra Deluxe

Currently, Book of Dead seems to be the game of choice. Many UK online casinos promote their service and entice players to sign-up by offering register card free spins in the Egyptian-themed game.



NetEnt launched Starburst in 2012. The game has since become a top choice for online casinos when it comes to new player incentives.

It’s no wonder since it’s among the most optimized mobile slot games. We know for a fact that many UK players prefer Starburst free spins because of the game’s notoriously high RTP. Our RTP guide explores other factors that come into play, like hit frequency and volatility.

This 5-reel x 10 pay lines slot is often praised for its colourful graphics. The electronic music soundtrack fits perfectly with the gem-filled design and wide range of dynamic features. This has led us to classify it among the best slots to play at the casino.

Win both ways unique feature

Slots that pay both ways do precisely what they claim: pay combinations from left to right but also from right to left.

The best part is that you don’t need to land any combination to activate it! This special feature is built-in normal gameplay so that any spin will count as long you have 3 or more consecutive symbols.

Irish Riches

Irish Riches

Irish Riches is a 6-reel slot developed by Big Time Gaming. Again, we have a Megaways slot on our hands. Each reel can hold up to 7 symbols, giving players a total of 117649 ways to win. To make it even better, the slot is hooked to the Jackpot King progressive jackpots network.

The Irish graphic theme means you get gems, gold, and glowing emeralds symbols, while the lower-valued symbols are the cards. A wild symbol in the shape of a golden horseshoe replaces any other symbol, except for the scatter.

Landing 4 scatters triggers a round of 12 free spins, which can be extended with 5 extra spins for each additional scatter symbol. Manage to get 3 or more diamonds in the top row of the middle reels, and you extend your bonus round even further.

Introducing cascading reels

Cascading reels give UK players more chances to land a winning combination. The symbols of a winning pay line are removed, allowing other symbols to fall in their place. Thus, the new ones may form another winning combination without you having to spin the reels again.

More and more software providers have adopted the cascading reels function. However, in our experience, none have managed to integrate it so seamlessly, like Big Time Gaming.

The process will only stop when the new symbols do not form an eligible combination anymore.

Gonzo’s Gold

Gonzo’s Gold

A NetEnt-powered title that stands out. Not many players are aware of its sequel, which brings us to the heart of the Incas’ culture.

We invite all out UK users to try the Gonzo’s Quest free spins to better understand the game without risks attached.

While the high 96.2% RTP means that you’ll get small but frequent wins, one cannot turn away from the 5000x max multiplier. Another significant difference is the game’s engine. Unlike its older brother, Gonzo’s Gold comes with a cluster pays system known for its cascading reels.

Cluster pays

Cluster pays is an innovative system in which matching symbols payout regardless of their positioning. The only rule is that the symbols must be grouped and touch one side of the grid.

In Gonzo’s Gold, you are awarded a prize whenever 3 or more corresponding symbols are grouped together. It’s no wonder this system makes Gonzo’s Gold one of the best slots to play at the casino. Compared to traditional slots, your chances to land a multiplier increase.

Sizzling Bells

Sizzling Bells

Sizzling Bells is a blend of classic fruity imagery and modern features. Built on a 5×3 reel, this slot is compatible with Wazdan’s revolutionary setting that allows you to set up your desired level of volatility!

What is slot volatility?

Slot volatility determines how often and how significant your winnings will be. It’s also known as a variance.

High variance means you’ll get more significant but winnings but less frequently. Conversely, a low volatility game will pay out more often but in lower amounts.

UK players are advised to choose the high volatility level on Sizzling Bells only if they have a large enough bankroll. Even if the RTP is 96.2%, you need to be cautious because it may drain your funds too fast.

Scatters and wilds multiply your stake when you place them appropriately on the reels. All for the top prize called ‘Super Grand Jackpot’, worth 15000x your stake. The second-best prize is worth it as well, rewarding UK players with 2500x their bets, making it one of the best slot machines around.

Hold & spin

Your aim is to activate the bonus game called ‘Hold the Jackpot’ with the help of 6 bell-shaped bonus symbols. Once activated, the interface will change completely, turning into a 6×5 grid. The screen will be halved, and you’ll get several respins.

During the round, instant cash symbols stick to the lower part of the screen. Landing cash symbols here will unlock the special bells in the upper side, each carrying multipliers worth 25-250x your stake.

Madame Destiny

Madame Destiny

Madame Destiny is a high volatility game with so many embedded features that it’s hard to pick just one to describe in detail. This feature-rich game is one of the best slot machines out there.

A Megaways slot comes with 200,704 ways to win. The game is enhanced with free spin rounds, tumbling reels, a bonus buys option and more. Moreover, it’s perfectly suited for mobile gaming.

The bonus wheel

Online casinos have been implementing wheel-type mini-games to deliver their no deposit free spins in a more exciting manner. Games like Madame Destiny inspired casinos’ bonus wheels.

The bonus round in Madame Destiny is triggered when 3 or more scatter symbols appear. Depending on the number of scatters you’ve landed, you get paid 5-100x your bet size. Then, it’s time for the bonus wheel.

Madame Destiny’s bonus wheel consists of an inner and an outer circle. The inner circle determines the number of spins you get. In contrast, the outer circle determines the multiplier applied to your winnings. Once spun, the bonus wheel awards the spins, and the bonus round begins.

While playing your bonus spins, landing 3 or more scatters will retrigger the bonus wheel—another reason why we praise Madame Destiny as one of the best slots to play at the casino.

Sweet Bonanza

Sweet Bonanza

Sweet Bonanza combines an impeccable design reminding you of classic mobile game Candy Crush with a suite of special features. But is it the best slot machine to play? In any case, it is an ideal spot for a quick, high volatility gaming session.

Sweet Bonanza comes with several advantages in terms of gameplay. Not only it pays both ways, but it pays all ways. Moreover, your sessions will be replete with all sorts of multipliers from 2x to 100x. Skillfully combining all the game’s features will potentially return 21100x your bet.

To activate the game’s sweet multipliers, all you have to do is connect 8 matching symbols anywhere on the grid. Exploding combos are like the cascading reels you may have seen in other games. Landing four lollipop scatters anywhere will unlock free spins, but there’s more to it.

The bonus buy feature

In Sweet Bonanza, you may activate the bonus round anytime you wish by paying 100x your bet amount. Simply go to the left side of your screen, and you’ll see an icon with an offer and cost. The cost of your bonus buy depends on your bet size.

Shining Crown

Shining Crown

Shining Crown is a classic slot that many UK players regard as one of the best slots to play at the casino. Gaming sessions are based on traditional symbols.

You play with fruits, sevens, scatters and an elusive Crown wild that expands to cover a whole row. Moreover, the game is also tuned up with a gamble feature.

Jackpot bonus round

EGT does not explain how a player can activate the bonus round. When it comes, though, you’ll know it. The reels will be replaced with a field of 12 face-down cards. You reveal cards until you get 3 matching symbols—spades, diamonds, hearts, or clubs.

Once you have a suite of 3 cards, you are awarded the jackpot prize for that symbol. You can check the current jackpot value at the top of your window.

The Price is Right

The Price is Right

The name may ring familiar to those who watched the game show on TV. However, we didn’t include it in our top merely for its link with this high-rated United Kingdom game show, but because it is one of the best slot machines to play!

Software developer IGT did a great job in combining its numerous bonus features with authentic details from the show, especially on the visual front. Featuring 5 reels and 25 classic pay lines, The Price is Right yields up to 1000x your line bet.

Our list featuring IGT casinos are what you need to access top titles from this software provider. We’re always prepared to give you the options you need!

Pick a bonus

This slots’ lucrative bonus rounds are based on authentic elements from the TV show. You trigger them by matching bonus symbols across 5 spins, and each comes with its perks.

For example

When you collect 5 Half-Off symbols you enter a ‘pick a bonus’ round. Select the right cards and eliminate empty gift boxes. The value of your rewards will depend solely on your selections.

The Price is Right also presents UK players with other bonus rewards, activated by landing corresponding symbols.

What’s common to all of them is that each requires you to ‘pick a bonus’:

  1. Cliff-hanger: spin the reels and determine the number of steps a hiker can take without falling off the mountain
  2. Any Number: select four cards valued 1-9, and if they complete any number displayed on-screen, your stake is multiplied by that number
  3. Plinko: choose the right cards and get rewarded with chips to prolong your session
  4. Master Key: Choose the cards underneath the keys are hidden and unlock extra chips

Wild Wild West

Wild Wild West

NetEnt makes its presence felt again with this action-packed slot set in a Wild West context. You can’t help but enjoy the comic book design and the western-themed background music.

All these elements make up for a great gaming atmosphere. Wild Wild West is a key component to any NetEnt casino UK.

Trigger the free spins round by landing at least 3 bonus symbols. In our case, the 7 fills this role. You’ll see a complex animation depicting a confrontation between cowboys.

Random features

Before playing your spins triggered by the bonus round, a random wheel game will select a special Wild to multiply your winnings even further. You either get Regular Wilds, Expanding Wilds, Multiplier Wilds or Spreading Wilds. During each bonus spin, the Wilds will overlay the standard symbols on reels 1-3.

Spreading Wilds are the most valuable since they will spread across 3 reels, to potentially higher payouts, up to 500x your bet amount. Random features include any in-game mechanics. They can upgrade a symbol’s multiplier, grant you free spins, and more.

Break da Bank Again

Break da Bank Again

Break da Bank Again Re-spin is a classic spin-off developed by Microgaming, with 9 paylines on 5 reels. UK players may wager between 0.09 and 22.5 coins per spin, and you can customize your stake according to your budget.

It also comes with an autoplay feature. UK players should use it with caution since we’re talking about a high-variance slot.

This slot aims to land 3 or more matching symbols on a payline, of which the wild is the most valuable. It can yield up to 833x your stake if you get 5 of them on the grid. But that’s not the maximum multiplier. Land 3 safe symbols and you enter the free spins round, in which the top prize is up to 4000x your stake.

We understand the struggle of finding a site that allows you to play titles from this provider. Thus, we’ve already prepared for you a list of Microgaming casinos that are worthy of your attention. Browse through our list and compare sites smart with our insights! Additionally, you can also take a look at our pages featuring iSoftBet online casinos and Quickspin casinos.

Re-spin a reel with Hyperspins

Dubbed ‘Hyperspins’, it allows you to re-spin any of the reels for a specific cost. The game’s design is strikingly similar to previous instalments, but the final addition to our list stands out through this rare special feature.

The cost of a re-spin will depend on what symbols you have on other reels. Should re-spinning any of them give you a higher chance for a significant reward, the cost will obviously be higher.

Rainbow Riches: Reels of Gold

Rainbow Riches Reels of Gold

Rainbow Riches is a slot created by Barcrest that’s most popular in land-based casinos. Renowned for its multiple special features, this slot brings classic Irish imagery and an exquisite set of additional reels on a 5×12 grid.

Besides the extra reels, the game lets you activate a free spins feature by collecting balloon symbols. Moreover, the purple fairy will trigger 3 different bonuses, the Wishing Well bonus, Reel Win Multipliers and Near Miss Win Feature.

In Rainbow Riches, you have 3 wild symbols, each with its own particularity: Magic Wilds, Wild Burst and Super Stacked Wilds.

Mini-slot bonus feature

Combining the bonus-buy feature and a mini-slot game, this game lets you trigger a bonus round through the Big Bet games. Choose your desired Big Bet game but know that they have a different cost for a reason.

RTP can be influenced to a certain degree. To reach the best RTP of 98%, you must play one of the highest Big Bet games, valued at around 10-25 credits. Pay to unlock the special feature and collect the 3 bonus symbols in the slot mini-game. It will trigger a bonus round in which the top prize goes up to 250000 credits.

Midas Golden Touch

Midas Golden Touch

Midas Golden Touch is a Thunderkick-powered slot that reinterprets the legend of King Midas, who turned everything into gold with his touch. With 15 pay lines on a 5×3 grid, Midas Touch has a Wild Multiplier which can boost your stake up to 32 times its value if you get 5 of them.

The free spins bonus round is triggered in a classic way, by landing 3 or more scatter symbols. In Midas Golden Touch, the scatter is the golden gate. Depending on your number of scatters, you get up to 20 spins.

Sticky Respin

The star of the show in Thunderkick’s offering is the Sticky Respin feature. Winning lines remain in position, while the other symbols spin again. The respin process continues until you don’t get any more winning lines.

The best part in this respin game is that each time a new bonus spin begins, a random wild is placed on the first rows, thus enabling potentially spectacular lines. The top prize of up to 10100 your stake and the excellent integration with the Wild Multiplier feature make the Sticky Respin feature one to look up to.

Decoding slot bonuses: unveiling the exciting features

What are slots bonus features

In slots, bonus features are those unique ingredients that may grant you multiplied wins.

The best slot machines have several extra components ranging from basic multipliers to expanding wild symbols, free spins, and even dedicated jackpot minigames.

If you’re looking for free slot machines with bonus rounds, it’s best to choose a promotion from top online casinos UK. They often have extra spins deals running in one of the games on our list!

Alternatively, you may get a preview of a slot by accessing the software developer’s website and playing a demo version. However, UK players are advised to go the first route.

How do we rank slots with bonus features?

Ranking the best slot machines should take into account the key elements of a game. We didn’t consider just a slot’s unique features.

Numerous factors have a strong say when you need to decide between games that could each cover the number 1 spot:

  • Multipliers and number of bonus features
  • Gameplay and feature integration
  • Visuals and graphic quality
  • RTP and variance

Attention to detail is crucial in the online gambling sphere. Thus, be sure that you only play on licensed slot sites. Check the footer of your site of choice and see whether it operates with a valid license.

Can casinos change slots’ payout percentage?

A slot has a fixed RTP value, and it cannot be changed, except for cases where RTP variation is built-in in the game. Online slot machines are built on Random Number Generators that independent agencies periodically inspect to ensure they are indeed working randomly

Therefore, any player has the same odds to get a payout at any time.

Elevate your gameplay: level up with exciting bonus features

Enhance your sessions with bonus features

Our top featured 13 of the best slots with bonus rounds. However, the list could have been supplemented with many other titles.

The aim was to get UK players acquainted with must-play bonus features. Some casinos offer you the option to sort games by special feature, so this knowledge will come in handy.

Start with our picks and explore our trusted listing of online casinos with a new perspective. In conclusion, whether you’re a seasoned player or new to the world of online slots, our expert picks offer a variety of options to suit every taste. From classic themes to innovative features, these top slot machines promise an exhilarating gaming experience. So, why wait? Unleash the fun and elevate your gameplay with these exciting bonus features today!

Cosmin Brehoi
AuthorCosmin BrehoiAuthor & Editor at CasinoAlpha

Since forever a student of life and writer at his core, he loves to gamble on football matches in his spare time. Combining the art of prediction and a rigorously trained intuition, he has joined the iGaming world to promote a responsible and data-driven approach to sports betting.

Adina Minculescu
ReviewerAdina MinculescuSenior Author & Editor at CasinoAlpha

Adina’s analytical way of thinking is what gamblers need to understand the casino market. With her expertise in this niche combined with her studies in linguistic typology and hermeneutics, you will get the essential help to make informed financial decisions. Let her be your reliable guide!