We are going to break down 2 types of slot bonuses. Below is a list of the casinos with the best slot bonuses and then we will go on to describe the slot games with the best bonus rounds.

Top Casinos with Slot Bonuses

Videoslots 9.8/10

Launched in 2011, the idea was to create a casino where you could play games from all major slots developers under one digital roof. If you’re looking for the biggest collection of slots anywhere online, you’ll find it at Video Slots. Review Videoslots

Launched in 2011, the idea was to create a casino where you could play games from all major slots developers under one digital roof. If you’re looking for the biggest collection of slots anywhere online, you’ll find it at Video Slots. Review Videoslots

UK Flag Deposit Bonus
100% up to £200 sign-up Welcome Bonus
on your 1st deposit
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. 18+ The Welcome Bonus offer is only available to those who have made their first deposit up to maximum of £ 200. Any amount over £ 200 will not form part of the player’s first deposit. In order to receive the maximum of £ 200 bonus, you will need to wager an amount equal to 35 times the value of your first initial deposit within 60 calendar days from the date on which the Welcome Bonus option has been activated. View all terms.

Deposit methods
Bank Transfer ecoPayz Entropay Euteller MasterCard Neteller PayPal paysafeCard Skrill Trustly Visa

LeoVegas 9.6/10

LeoVegas was launched in 2012 and has been one of the leading UK casinos ever since. They have some great bonuses and promotions for new and existing players. They also have an excellent selection of games including slots, roulette, blackjack and other live casino games. Review LeoVegas

LeoVegas was launched in 2012 and has been one of the leading UK casinos ever since. They have some great bonuses and promotions for new and existing players. They also have an excellent selection of games including slots, roulette, blackjack and other live casino games. Review LeoVegas

UK Flag Deposit Bonus
100% Deposit Match offer up to £50 AND £6 in Reward Games that can be enjoyed on selected games
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. 18+ BeGambleAware.org Full T&Cs apply. New players only. 7 days to claim offer with a further 7 days to wager on Live casino. Wagering contributions vary. £6 bonus has 3 day expiry to use on selected Evolution games. View all terms.

Deposit methods
MasterCard PayPal Skrill Visa

21 Casino 9.7/10

21 Casino has a growing reputation with lots of promotions that punters can take advantage of and the live dealer games are an attractive part of the package. With really fast withdrawal times, we recommend them as one of the top UK casinos to join. Review 21 Casino

21 Casino has a growing reputation with lots of promotions that punters can take advantage of and the live dealer games are an attractive part of the package. With really fast withdrawal times, we recommend them as one of the top UK casinos to join. Review 21 Casino

UK Flag Deposit Bonus
121% up to £300
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. Full T&Cs apply 18+. New players only. Min deposit £10. Bonus funds are 121% up to £300 and separate to Cash funds. 35x bonus wagering requirements apply. Only bonus funds count towards wagering requirement. £5 max. bet with bonus. Bonus funds must be used within 30 days, otherwise any unused shall be removed. Terms Apply. BeGambleAware.org View all terms.

Deposit methods
Bank Transfer MasterCard Neteller PayPal paysafeCard Skrill Trustly Visa

Unibet 9.2/10

Unibet have a nice selection of casino games inclduing roulette, blackjack, slots and live casinos games. With a generous welecome offer and fast cash-outs, Unibet are worth a try! Review Unibet

Unibet have a nice selection of casino games inclduing roulette, blackjack, slots and live casinos games. With a generous welecome offer and fast cash-outs, Unibet are worth a try! Review Unibet

UK Flag Deposit Bonus
Deposit £10 and get a £40 bonus
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&Cs apply. 18+. BeGambleAware.org. New Customers Only. Minimum deposit £10. 50x wagering requirement apply. Bonus will expire 30 days after opt-in. Further T&Cs apply. #AD View all terms.

Deposit methods
Bank Transfer MasterCard PayPal paysafeCard Skrill Visa

For the most part, slots play out on a single, main set of reels. Players place their per spin bets and take their chances, crossing their fingers in hope that the reels land a winning combination. But much of the big money action takes place away from the main reels altogether, courtesy of slots bonuses and free spins rounds.

These are features built in to improve the gameplay experience, as well as providing slots fans with the opportunity for feature wins. But how can you make sure you’re playing online slots with the best slots bonuses, and what do you have to do to trigger these bonuses once you start spinning?

How to trigger a bonus on a slot machine?

The vast majority of slots games make these winning combinations from a series of standard value symbols – symbols that are usually styled in the theme of the game, or representations of high cards from a standard pack of playing cards.

But there are also usually a couple of special feature symbols floating around, which can come on to your board when you least expect it. Scatter symbols exist to trigger bonus rounds in slots games. In some cases, landing three or more scatters will net you an instant scatter win. It’s usually about unlocking the bonus rounds, and everything that entails, to give you the chance of winning big from your spinning session.

The method of triggering the bonus round very much depends on the slot. In most cases, it’s 3 or more scatters anywhere in view on a single spin, but sometimes you might need 5 scatter to trigger the bonus, or a particular number or order or scatters across selected reels. This is one area where game developers have discretion, so it’s always worth checking the rules ahead of time to get an idea of how the bonus works.

One thing you can be certain of is that the bonus feature is where some of the biggest wins are to be found. In almost all cases, the bonus features are where players win most of their money, save for landing a jackpot or progressive. And because bonus features crop up more frequently than jackpot wins, it’s important you make the most of them when the opportunity presents.

What slots have the best bonuses?

Some slots have better bonuses that others, depending on the game’s payout percentage, house edge and volatility. In some cases, the bonuses are simply more fun. But which slots have the best bonuses? We’ve picked out three of our favourites.

Street Fighter 2

street fighter slot

Fans of the Street Fighter 2 arcade original will absolutely love this slot, and especially the bonuses it has to offer. Beat the Boss Free Spins pits players against boss characters from the game including M. Bison, Sagat and Vega, with ascending multipliers based on boss difficulty. There’s also a Car Smash Bonus where you beat up the car to win prizes, exactly mimicking the video game original. The gameplay elements here are second to none – and it’s not a bad paying game either.

Fat Rabbit

fat rabbit bonus round

The bonus in Fat Rabbit from Push Gaming is a carrot munching spectacular. The bonus is triggered when the carrot and the rabbit both land on the reels at the same time. The rabbit moves around the reels munching carrots, while adding up the total number of carrots in the carrot meter. When the meter fills up, you’re added 3 extra free spins with a larger rabbit symbol, and the round continues. Play your cards right and you’ll end up with a huge 5×5 wild symbol, which will put you in the best possible position for a winning spin.

Reel King Megaways

reel king megaways bonus

No scatter symbols to worry about in Reel King Megaways – just lighting up the reels with each successive cascading win. Every time you spin, one or more of the reels lights up, with a full sweep of lit reels required in order to trigger access to the bonus round. Once inside the bonus round you get to spin on a new reel set, where you can win up to 10x. Light up more of the reels on this second reelset and you’ll be on to the free spins trail, where some of the best wins in the game are to be found. And this all takes place with the benefit of Megaways features and paylines.

Are slot bonuses predetermined?

Slot bonuses are not predetermined, and are subject to the same randomness as any slots spin. Some players make the mistake of assuming that because they’re playing a slot online, the outcomes are decided by software in advance, and often in the operator’s favour. This couldn’t be further from the truth.

Online slots at licensed online casino operators are subject to compliance checks, and are audited to ensure they are properly random. Every spin comes with an equal chance of triggering a bonus feature, and the results are determined at the moment you spin the reels, rather than in advance. That means you can be sure you’re getting a fair experience with your slots bonus – all the more reason to try and trigger these features in your game. Read our UK casino reviews if you would like to find out more information about each casino.

Bonus Wins Make or Break Your Session

Slots bonuses can make or break your session, with big feature wins often the difference between walking away in the black or in the red. By far the easiest way to build your bankroll from any slots game, bonus features are where the vast majority of players see their biggest share of winnings across different slots games.

So make sure you’re looking at the bonus features available for any slot you’re considering playing, and get to know how the features work and what potential prizes are waiting to be won. With the right approach, you can find the best slots bonuses for maximising your winnings, for the most productive slots play session.

Casinos with the Best Slots Bonuses

Videoslots 9.8/10

Launched in 2011, the idea was to create a casino where you could play games from all major slots developers under one digital roof. If you’re looking for the biggest collection of slots anywhere online, you’ll find it at Video Slots. Review Videoslots

Launched in 2011, the idea was to create a casino where you could play games from all major slots developers under one digital roof. If you’re looking for the biggest collection of slots anywhere online, you’ll find it at Video Slots. Review Videoslots

UK Flag Deposit Bonus
100% up to £200 sign-up Welcome Bonus
on your 1st deposit
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. 18+ The Welcome Bonus offer is only available to those who have made their first deposit up to maximum of £ 200. Any amount over £ 200 will not form part of the player’s first deposit. In order to receive the maximum of £ 200 bonus, you will need to wager an amount equal to 35 times the value of your first initial deposit within 60 calendar days from the date on which the Welcome Bonus option has been activated. View all terms.

Deposit methods
Bank Transfer ecoPayz Entropay Euteller MasterCard Neteller PayPal paysafeCard Skrill Trustly Visa

LeoVegas 9.6/10

LeoVegas was launched in 2012 and has been one of the leading UK casinos ever since. They have some great bonuses and promotions for new and existing players. They also have an excellent selection of games including slots, roulette, blackjack and other live casino games. Review LeoVegas

LeoVegas was launched in 2012 and has been one of the leading UK casinos ever since. They have some great bonuses and promotions for new and existing players. They also have an excellent selection of games including slots, roulette, blackjack and other live casino games. Review LeoVegas

UK Flag Deposit Bonus
100% Deposit Match offer up to £50 AND £6 in Reward Games that can be enjoyed on selected games
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. 18+ BeGambleAware.org Full T&Cs apply. New players only. 7 days to claim offer with a further 7 days to wager on Live casino. Wagering contributions vary. £6 bonus has 3 day expiry to use on selected Evolution games. View all terms.

Deposit methods
MasterCard PayPal Skrill Visa

21 Casino 9.7/10

21 Casino has a growing reputation with lots of promotions that punters can take advantage of and the live dealer games are an attractive part of the package. With really fast withdrawal times, we recommend them as one of the top UK casinos to join. Review 21 Casino

21 Casino has a growing reputation with lots of promotions that punters can take advantage of and the live dealer games are an attractive part of the package. With really fast withdrawal times, we recommend them as one of the top UK casinos to join. Review 21 Casino

UK Flag Deposit Bonus
121% up to £300
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&C’s apply. Full T&Cs apply 18+. New players only. Min deposit £10. Bonus funds are 121% up to £300 and separate to Cash funds. 35x bonus wagering requirements apply. Only bonus funds count towards wagering requirement. £5 max. bet with bonus. Bonus funds must be used within 30 days, otherwise any unused shall be removed. Terms Apply. BeGambleAware.org View all terms.

Deposit methods
Bank Transfer MasterCard Neteller PayPal paysafeCard Skrill Trustly Visa

Unibet 9.2/10

Unibet have a nice selection of casino games inclduing roulette, blackjack, slots and live casinos games. With a generous welecome offer and fast cash-outs, Unibet are worth a try! Review Unibet

Unibet have a nice selection of casino games inclduing roulette, blackjack, slots and live casinos games. With a generous welecome offer and fast cash-outs, Unibet are worth a try! Review Unibet

UK Flag Deposit Bonus
Deposit £10 and get a £40 bonus
Play
eligibility

Eligibility: This offer is only available for first time depositors. BeGambleAware 18+

T&Cs apply. 18+. BeGambleAware.org. New Customers Only. Minimum deposit £10. 50x wagering requirement apply. Bonus will expire 30 days after opt-in. Further T&Cs apply. #AD View all terms.

Deposit methods
Bank Transfer MasterCard PayPal paysafeCard Skrill Visa