Jackpot Slots

Jackpot slots are more than they appear. They may look like your average UK casino game and be played similarly, but they present the possibility of winning a huge prize. You could win thousands of pounds when playing some of your favourite slots. From The Pig Wizard to the Top Cat slot, there's plenty of choices if you're looking for the most epic jackpot slots. Gaming giants Blueprint even offer their own range of jackpot slots, so each time you spin the reels of Genie Jackpots, Winstar slot and more, you could be in with the chance of winning an incredible sum.

How do jackpot slots work?

The way the jackpot is won depends on the type of jackpot available, but both jackpots available at 21.co.uk work on the same premise. Each time a stake is placed in a jackpot slot, a percentage of this stake will be added to the progressive pot until the jackpot is won. This is how the jackpot grows to be more and more valuable over time. When a jackpot is won, the progressive pot value will reset and the process begins again. The size of the prize available will vary from slot to slot, as this is dependent on how many people have played it thus far. The available jackpot prize will be displayed on the game's thumbnail, so you can use this to decide which of our jackpot slots to play. Jackpots are triggered at random, so there's no guarantee that you will trigger it, and no one knows when it will be awarded. At 21.co.uk online casino, there is an excellent collection of different jackpot slots to play, and we release new titles month on month, so keep checking back.

Jackpot King Progressive

When you think about jackpot slots, your mind probably turns to the Jackpot King Progressive with slots like Paws of Fury. This popular prize has become famous for awarding huge cash sums, and many of our slots are plugged into the progressive pot. The Jackpot King is triggered randomly by any spin at any stake and is split into three different stages. So what can you expect if you're the lucky player who triggers the Jackpot King Progressive? The first stage isn't too dissimilar to standard play, except you're spinning the reels for golden crown symbols. The more crowns you collect, the further you'll progress through the Cash Trail, which is the second stage of the Jackpot King Progressive. The Wheel King awaits those who make it to the end of the trail. Spin this tombola-style wheel for huge multipliers and the chance to win the progressive pot. 0.13% of every amount staked on your chosen jackpot slot is added to a reserve pot. When the jackpot is won, the progressive pot will reset to the reserve pot value. The jackpot begins with a seed amount, which funds the prize’s original amount, meaning the pot is never completely empty. 0.86% of each stake placed is then added to the progressive pot. The remaining 0.13% is given to the reserve pot.

How to win the Jackpot King

You can play on some of our top slots and the jackpot will just keep rising until a player lands the correct symbols to trigger the jackpot. To win the Jackpot King Progressive Jackpot, you'll need to enter the Jackpot King Bonus Round. Find five Golden Crowns on the reels after any spin, and the bonus round will begin. You'll then be shown the Super Reels, where you'll have to find even more Golden Crowns. The more Golden Crowns you find, the higher up the Cash Trail you will go, taking you closer to the Wheel King Bonus. Along the way, you'll also find pieces of the King's Treasure, which will give you cash prizes, or even Free Spins. When you reach the top of the Cash Trail, you'll begin the Wheel King Bonus. Here, you will spin the wheel to win up to a 1000x multiplier, or who knows, you might even win the jackpot itself!

Jackpot Slots Glossary

Cash Trail - the second part of the Jackpot King Progressive, which allows you to try and advance towards the Wheel King.

Fixed Jackpot - a jackpot that awards a fixed prize sum.

Golden Crown - symbols you need to collect when the Jackpot King Progressive is triggered to progress through the bonus.

Reserve Pot - the prize pot available just after the Jackpot King progressive pot is won, ensuring the pot is never empty.

RTP - refers to Return to Player, which means the amount offered to players by the slot over time.

Progressive Jackpot - a jackpot prize that grows each time a stake is placed on a jackpot slot.

Promotional Pot - the jackpot prize, which increases each time someone places a bet on the relevant jackpot slot.

Wheel King - the final stage of the Jackpot King Progressive. A wheel that is spun to award multipliers or the progressive pot.

Common Jackpot Slots Rules

Basic jackpot slot rules are more or less identical to those of a standard slot game. Always familiarise yourself with the rules, RTP percentage and paytable of your chosen slot before you start playing. As previously stated, a percentage of each stake placed will contribute to the progressive pot. However, don't let this entice you to rush in and bet more than you can afford in order to increase the jackpot prize. The Jackpot King Progressive isn't all about the progressive prize, there are plenty of other prizes available at various stages, and huge multipliers can be won.

Best Jackpot Slots

Romeo & Juliet Slot

The Shakespearean love story lives on in slot form in Romeo and Juliet slot. Keep your eyes peeled for the Jackpot King symbols and if you land one on every reel, then you have the chance to win the Jackpot. The Romeo & Juliet jackpot slot may leave you with a new appreciation for the iconic play.

Naked Gun

The Naked Gun slot is a slot that is full of bonus features and roaming wilds, as well as a chance to take home a jackpot. This online slot game has clips from the classic movie, along with enough features to make sure a win is never far away. To win the Jackpot King, you'll need to find 5 Jackpot symbols on the reels, giving you access to a unique bonus round. Keep on spinning for your chance to spin the Wheel King and take home a jackpot.

Deal or No Deal: What's in Your Box?

Our Jackpot King UK slots are always popular amongst our players, so we expect the Deal or No Deal slot to be no different. Face off against the Banker and play in the Deal or No Deal studio in the slot based on the classic TV show. Enter the Jackpot King Bonus by finding special overlay symbols on the reels. Take a spin of the Wheel King Bonus and you could be taking home a jackpot.

Worms Reloaded

The Worms Reloaded slot has arrived at 21.co.uk and gives you another chance at winning the Jackpot King Progressive! Look out for Bonus symbols and the exploding Worms Grenade for your chance at triggering 1 of 8 unique bonuses. To try and win the Jackpot, look out for 5 Golden Crowns landing on the reels. Then spin the Gold Reels, reach the Wheel King Bonus and you could be spinning for the Jackpot King.

Paws of Fury

Our range of Jackpot King slot games are getting bigger and better and don't we have a treat for you. We present to you Paws of Fury slot that's packed with bonus features such as the juicy Jackpot King feature. Receive 5 Golden Crowns anywhere on the reels to be awarded the Jackpot King bonus. See if the fantastic panda can kick-start the reels and reward you with the Jackpot King bonus feature.

Blueprint's Progressive Jackpot Slots

As well as the Jackpot King Progressive, there is also a chance to win the Blueprint Progressive Jackpot. Just when you thought Blueprint slots couldn't get any better, they added the holy grail of bonus rounds to many of their most popular titles. Like the Jackpot King Progressive, this Jackpot will start at £10,000 and increase each time anyone spins the reels. Each game offers a different way to win the jackpot, which adds a little more variance to this style of the jackpot.

Genie Jackpots

The first slot that offers the Blueprint Progressive Jackpot is Genie Jackpots. You'll have to find the Progressive Jackpot symbol in any of the three Power Spins that can be won in the game. Find just one of these symbols to win one of the biggest jackpots that slots can offer.


The Winstar slot will take you on a journey through outer space, hunting for jackpots along the way. You'll have to find five Golden Reels all at once to take the jackpot home with you.

Beehive Bedlam Slot

Beehive Bedlam jackpot slot also offers the chance to trigger the valuable Jackpot Progressive. If you're looking for a slot that might just give you the chance to get your hands on some jackpot spoils, Beehive Bedlam may be your game of choice. The Jackpot Progressive can be activated during the Free Falls feature, which are triggered when you connect three or more Free Fall symbols. Beehive Bedlam jackpot slot is plugged into the Blueprint progressive pot and offers the chance to move between different worlds that open up different bonuses.

Other than Jackpot Slots, what else does 21.co.uk offer?

You should now be well versed in jackpot slots. The spinning doesn't have to stop, though! 21.co.uk have a wide variety of online slots and jackpot slots are only a section. Our casino games at 21.co.uk are handpicked to ensure you have the best online casino experience possible. From classics such as Rainbow Riches and Starburst slot to popular favourites such as Fishin' Frenzy and Book of Dead slot.

Live Casino Games

If you prefer live casino tables to the slot reels or just fancy a change of pace, we also have a huge range of live table games. From innovative online blackjack variants to realistic online roulette tables, there’s something for every casino enthusiast. For all the latest news on slots and live casino games, from new releases to blackjack strategy guides, check out our casino blog.

Casino Bonuses What would an online casino be without casino bonuses? See our latest casino bonus promotions for more. You'll find offers like free spins, deposit bonuses and much more! Play as you normally do but increase your profits when you win with our casino bonuses.

Online Betting

For the sports fans, we have our online sports betting section. You'll find the latest fixtures and odds for the world's biggest sporting events. Whether you're a fan of football betting, rugby union betting, rugby league betting, darts betting or another sport, you'll be able to place your bets right here at 21.co.uk. For those looking for some betting advice, our betting tips blog will provide you with upcoming fixtures, tips, sports game previews and reviews.

If you miss placing your bet and the event has begun, don't worry. Our live in-play betting sportsbook means you can place your bets when your game is in-play. It's the ideal betting solution for the analytical sports betting lovers among you.