Top 10 Online Slots
Ever since online gambling started taking off in the mid-90s, online slot machines have dominated the arena. These games, it seems, have a lasting endurance that extends beyond the sensation of pulling a lever or pushing a button and watching the reels turn. Today, the best UK online casinos are packed full of the latest slot titles, an iGaming genre in which the industry’s top developers concentrate most of their creative efforts.
While these slots have evolved over the years – bringing new innovations such as progressive jackpots and multiple bonus features – the fundamentals remain the same: spin those reels and hope your luck is in.
We’ve had a long hard think about some of our favourite online slots over the years and have narrowed them down to this recommended list of ten. This is by no means an exhaustive list, but together they represent a decent mix of the world’s top slots, with lots of variation in return to player (RTP) rates, variance, paylines, bonus features, and jackpot wins.
Based on the travels of a young Spanish conquistador who went in search of the lost city of El Dorado, Gonzalo Pizarro, Gonzo’s Quest has been one of the most popular online slots of recent years. Released in 2013 by NetEnt, Gonzo’s Quest is a 5×3 reel slot with 20 paylines and an RTP of 95.97%. To stand a chance of striking gold with Gonzo, players will need to match three Inca symbols on the grid from left to right; each time this happens, the winning symbols are replaced in an avalanche, building up consecutive multipliers to a maximum of 5x. Pay attention to the gold coin, which is known as the free fall symbol in this slot, and any reel containing three of these will activate ten avalanches. NetEnt is known for its attention to detail, and we love how animated Gonzo is, even in the quieter moments of this game – you’ll find him scratching his beard, removing his helmet, and even moonwalking during your hunt for treasure.
Another blockbuster release of recent years, NetEnt’s Starburst takes place in an otherworldly backdrop where it seems there’s nothing in the universe but dazzling jewels, bars, and lucky sevens. Starburst is a 5×3, 96% RTP slot with a famed win-both-ways feature, meaning players can build winning combos in both directions. Starburst combines classic online slots with the crazed formula of games like Bejeweled, rewarding players with frequent but small wins. To be in with a shot at winning the max jackpot of 250x the stake, players will need to land the wild symbol on one of the three middle reels; if they do, the wild will expand and the reels will be re-spun up to a maximum limit of five times.
Riche Wilde and the Book of Dead
Play’n GO’s Book of Dead is regularly included in welcome bonus offers by some of the best online casinos in the UK. It’s easy to see why: released in 2014, this 5×3 reel slot includes a free spin feature, expanding wilds, first-class sound and graphic animations true to the Egyptian theme, and a decent RTP rate of 96.2%. Book of Dead takes place in the Tomb of the Pharaohs alongside Rich Wilde, an Indiana Jones-esque figure who continues his quest for ancient treasures. Payouts begin when three or more symbols form in a winning combination, but the real money is in the book of dead symbol – this serves as the game’s scatter icon, and hitting three or more across the reels will reward players with ten free spins.
Perhaps the biggest progressive jackpot slot in history, Microgaming’s Mega Moolah takes place on safari with a 5×3 reel grid and an RTP of 88.1%. If you take a look at the highest single payouts in UK online casino history, Mega Moolah is responsible for most of these – in 2015, John Heywood won over £13m from a 25p stake, and this remains the British record.
There’s no hidden secret to landing a huge prize though, with jackpot wins coming entirely at random, in some cases taking months on end to drop. However, higher stakes have an increased chance of releasing one of the game’s four jackpots. Mega Moolah can also be played as a standard video slot with an RTP of 95%.
Mega Joker takes the classic slot iconography and enhances it for a modern online gambling experience. All the familiar symbols are in play on this 5×4 grid, including sevens, cherries, melons, lemons and more. Added to the excitement of this Novomatic slot are the jester wilds and the star scatters – finding any of these scatters is good news, but finding five of them in one spin of the reels will reward players with a payout of 40,000x their stake. Released in 2013, and with an RTP rate of 95%, stakes on this slot can start as low as 4p, making it suitable for punters on tight budgets.
If you’re looking for an online slot stripped back to its simplistic best, then look no further than Playtech’s legendary Goblin’s Cave. This 3×3 reel takes place inside the titular character’s lair, and players can place wagers from as little as 0.01 coins. The wild symbol is represented by the red gem, while the scatter is the lantern – three of these appearing on one payline will trigger the bonus round, which invites players to simply select which treasure chest they’d like to claim. Once they’ve done so, the contents of the chosen chest will be revealed, taking the form of either free spins or cash prizes. With an RTP of 96%, Goblin’s Cave is one of the industry’s most enduring products, released all the way back in 2007.
Another product of the prolific NetEnt studio, Jackpot 6000 has one of the highest RTP figures of any online slot in the world at a staggering 98.9%. Although the game was released in 2014, this has the look and feel of an old-school game, taking place on a traditional 3×3 reel mechanical slot inside a casino which is sure to please any purists. Just as you would on a mechanical slot, players win prizes by building combinations from left to right. But when you strike lucky on Jackpot 6000, you’ll be confronted with the Supermeter – a feature that invites players to wager their winnings again or collect the money and return to the base game.
Head into the sultry world of ancient Egypt with IGT’s Cleopatra – a 5×3 online slot released in 2012 with an RTP of 95.7%. There’s no surprise that the goddess herself serves as the game’s wild, with the Sphinx suitably adopting the role of the scatter icon. It’s these scatters that trigger the bonus round: if players land three or more of these they’ll receive 15 free spins, and any winnings generated from these bonus spins will be multiplied by three at the end of the round. With an authentic soundtrack, a dazzling interface filled with colour, and a potential jackpot of 10,000x the stake, Cleopatra has been a prominent fixture at top UK slot sites for almost a decade.
If you like Guinness, violins, Irish jigs, and pots of gold, you’ll be sure to love Lucky Leprechaun – a 2015 slot by Microgaming with an RTP rate of 96.3%. The Irish theme is really laid on thick here, but we find that this makes for a light-hearted title with plenty to enjoy. For starters, the soundtrack is great, the animations are sharp, and the game is packed full of bonus features. The best of these bonus rounds is the Trail of Fortune, which is triggered when three or more pots of gold appear on the reels. At this point, you’ll be shown a winding road, at the end of which is a pot brimming with gold pieces. Simply spin the dial at the bottom according to how many pots of gold triggered the bonus game, and work your way up to the jackpot. In addition to this, there’s also a free spins bonus launched when the lucky clover lands on the last reel.
Book of 99
Released in 2021, Relax Gaming’s Book of 99 is the newest online slot in our list of recommendations and comes with an incredible 99% RTP rate. There’s a cinematic quality to this online slot, with players given an animated introduction before being taken to the 5×3 grid, framed within an ancient Greek temple. There are two ways to launch bonus features in this game: the first is to land three of the book symbols on the reel, which will trigger a free spin round where one symbol is selected as the expanding wild; the second is to collect a total of 99 books across multiple spins, which will reward players with ten free spins.