Bright lights, buzzing, high-pitched pinging and the sound of coins clattering into the metal payout tin, casinos just wouldn’t be the same without slots.
These days, ‘one-armed bandits’ take up 80% of the game rooms in Las Vegas, and are truly the in-vogue entity on the casino floor, and that’s the same online. Slot machines are great fun, and the chances of winning are pretty favourable too.
Developed in Brooklyn, New York in the late 1800’s, slot machines were often on the periphery of the casino floor during their formative years and were treated with little regard by most casino owners. In fact, for the most part, slot machines were used exclusively by the wives of the table-game players as a way to stifle their boredom.
Today, slot games have never been more popular, especially at UK online casinos which are packed to the rafters with all different types of slots with huge companies like Universal, HBO and MGM all clambering to get involved in the market.
For the player, there’s never been a better time to be a slot player. Whereas with traditional table games like roulette, poker, baccarat and blackjack your wins are mostly incremental, when playing slot machines you could win tens of millions with just a few pence.
Games like Mega Moolah and Mega Fortune have become known in the casino world for pouring out huge wins from tiny stakes, and with the competition only likely to become more and more fierce, the jackpots are only going to increase and increase.
In the below table we look at the casinos offering the best games, the casinos offering the most variety of games, and we also take into account the UK casinos offering the best promotions on their featured slot games.
Some of our selected casinos only offer slot game by a certain software provider which may sound limited, but these type of casinos have tons of exclusive slot games to boot.
However, conversely, we also showcase the casinos that offer a number of different software providers. On these type of casinos, you’re likely to see a whole eclectic mix of games with plenty to choose from.
Whatever you’re looking for from your slot – the big wins, the fun bonus rounds, the beautiful graphics – we have you covered. Have a browse through our ever-evolving, constantly updated table below and read the reviews for more detail so you can find your best-matched slot haven.
|Casino||Editors Rating||Best Features||Bonus||User Rating||Play|
Up To £250
+ 100 Bonus Spins
Launched in 2018, the guys behind the creation of WinStar have created something truly special here. But in what way? Click on through to find out!
Up to £200
+ 200 spins
Casino Joy was launched in 2018, and on their website they state that they offer, "a casino journey that's as natural as the feeling of grass beneath your feet." Nice.
Bonus Up to £1,000
Over 3 Deposits
Aspers Casino is the brand you can trust and with a deposit bonus of up to £1,000, we couldn't agree more. Find out how to sign up and claim your bonus right here.
Up To £100
Don't you love a casino that offer a no deposit bonus? Well that's what you get with Winomania! Click through to our WinOmania casino review to claim it!
80 Wager Free Spins
Not one wager requirement!
PlayOjo is the new kid on the online casino block, and from its impressive graphics and speedy loading times, it’s immediately noticeable that it’s not just come to play around, it’s come to dominate.
150% up to £150
+ 15 spins
Launched in 2018, MansionBet is the subsidiary of the online gambling heavyweight Mansion.com, but how does it compare to its older brother?
Up to £100
+ 100 extra spins
Launched in 2017, this is how SlotsMillion describe themselves, "SlotsMillion was created by a group of experienced land-based casino industry figures and technologists who share a passion for slots and casinos, and are driven by the vision of creating an online casino that works beautifully and seamlessly on any device – laptop, tablet or smartphone."
Up to £100
+ 300 Free Spins on Starburst
Launched in 2018, Genesis Casino is attempting to take the casino world by storm. This is how they describe themselves, "If the universe was a game of luck, Genesis Casino is the starting point! You can suit up and spin into the online casino space with total transparency - nothing is more than one click away whether it's terms, the latest game release or seamlessly smooth payment methods. A genuine online casino that's simple and straight to the fun!"
100% Bonus up to £300
+ 20 Free Spins
Casumo is a relative oldie, having been established in 2012. Read our review to find out about the 100% Bonus up to £300 + 20 Free Spins welcome offer!
100% bonus up to £20
Only 5 x wagering
Grosvenor are well-known for their high-class land-based casino's which have been a feature of the British high street since 1970, but how does their online casino, which launched in 2007, stack up?
100% Welcome Bonus
Up to £200 + 50 Free Spins
As a relatively new casino on the market, Vegas Hero brings a commitment to lightning fast withdrawals, powerful promotions, free spins and bonus boosts. But do they deliver, or are they on course to become public enemy number one?
100% match up to £250
+ 150 free spins
Cashino is an old school back to basics online casino which very much mirrors their high street shop approach
Is it the bright flashing lights? Or the ambient dissonance of spinning and winning? It could be Las Vegas where the classic 'one-armed bandits' have become synonymous with the casino capital and the numerous movies and TV shows featuring them. Whatever image your mind conjures, slot games are always popular. As times change, so do players' habits and the shift from real casino play to online slot machines continues to gain momentum.
Casino Circle is here to steer you through that heavy stream of UK online slot games and help you find the best ones to play.
The precursor to the modern slot machine was created by Sittman and Pitt of Brooklyn, New York in 1891. The machine had five drums and 50 card faces as a solo version of poker. The basic premise involved sticking a nickel through the slot, pulling the "arm" and trying to get the best poker hand you could. But as you couldn't gamble for money, winners were awarded certain prizes in exchange for good hands.
German-American Charles Fey improved Sittman and Pitt's model and created what we know as the modern slot machine. He reduced the amount of reels to and changed the cards to symbols, using horseshoes, diamonds, spades, hearts, and a Liberty Bell which gave the machine its name. This simple format still exists today. The symbols often change but classic slot games still use the bell from the original.
From there, slot machine manufacturers tried to avoid US gambling laws against illegal cash prizes by offering chewing gum in exchange for wins. Fun fact: the Bell-Fruit Gum Company used on some old slot machines is where the BAR symbol comes from. By the 60s, the first fully electromechanical slot machine was developed and a decade later, the first video slot was made. The rest is slot history!
Slot game or slot machine are the general terms used globally but there are some words used in different countries.
Slot games are very popular, arguably more than the machines "in the wild". That's why major corporations have jumped in with licenced games for the likes of Jimi Hendrix, Guns N' Roses, Vikings, and Jurassic Park. But why? Well, there's the variety. Here at Casino Circle, we provide all kinds of UK slots, in 2D and 3D, with set jackpots and progressive jackpots, classic and new. There's no need to leave the house as you can play on any device with internet access. And you don't have to break the bank to start. If luck is on your side, you could win millions from a spin worth less than £1. That's a better return than the National Lottery!
Going back to those game types, here is a brief summary of what they are:
With all the talk of winning millions, it's important to know how much slot machines are likely to pay out over time. Old slots had 3 reels and 10 symbols which gave 1000 possible combinations. As the chance of any combination was 1 ÷ 10 x 10 x 10 = 0.01%, jackpots were lower and became boring after a while. Now, most video slot games have 5 reels and certain symbols are weighted in their probability of appearing, increasing the combinations and allowing for bigger jackpots.
UK slot machines are programmed to pay out a certain percentage of money put in. For slot games we feature, that percentage is usually between 88%-97%. This is called the RTP or "return to player". We calculate them slightly differently. We take the RTP away from 100% and that is called the "house edge", as that's the "edge" the "house" (ie. casino) gets back. Anything over 5% for a house edge is considered "high" and means you'll need to put a lot in to get it back over time.
Example: Millionaire Genie has a house edge of 4.98%. If you were to place a £1 bet for 100,000 spins, you would win back £95,020 on average, and the casino would keep the remaining £4,980.
Probabilities of certain symbols falling on the paylines are determined by PRNGs or Psuedo Random Number Generators. More sophisticated PRNGs continue to generate different combinations even when the game isn't running to prevent players from predicting the next spin outcome.
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