Best Online Slots Casinos and Games in the UK 2025

🎰 Theme: Fishing

✅ Four-level free spins bonus with extra wilds and instant cash prizes

✅ Above-average RTP of 96.71% with high volatility

✅ Huge top prize of 5,000x your bet

💰 Best welcome bonus: 50 free spins on Big Bass Splash at LeoVegas

🎰 Theme: Fishing

✅ Free spins mini game with multipliers of up to 10x

✅ Range of in-game bonuses including instant prizes

✅ Original title in hugely popular Big Bass series

💰 Best welcome bonus: 100% up to £100 at Jackpot City

🎰 Theme: Classic

✅ Massive top prize of 20,000x your bet

✅ Entertaining ‘Pop the Bubble’ bonus round

✅ High volatility for larger payouts

💰 Best welcome bonus: 200% up to £200 at 888 Casino

🎰 Theme: Ancient Egypt

✅ Original game in hugely popular Rich Wilde slots series

✅ Double or nothing gamble feature on every winning spin

✅ Free spins with expanding symbols and 1p minimum bet

💰 Best welcome bonus: 100 free spins on Book of Dead and 100% up to £100 at Duelz

🎰 Theme: Space

✅ Win both ways paylines that double your chances to win

✅ Special Starburst symbol turns reel wild with instant respin

✅ Simple yet fast-paced gameplay is great for slots beginners

💰 Best welcome bonus: Up to 150 free spins on Starburst and 100% up to £300 at Dream Vegas

🎰 Theme: Jungle

✅ 4,096 ways to win on every single spin

✅ Free spins with progressive multiplier of up to 15x

✅ Four win modifiers and four fixed jackpots up for grabs

💰 Best welcome bonus: 100% up to £100 at Neptune Play

New slots are added to online casinos on a near daily basis. Playing new slots is a good way to try out the latest features devised by software providers and enjoy recent releases in popular slots franchises, such as the Big Bass and Reel King series. If you’re looking for something different from traditional slots gameplay, new slots are normally the best place to start.

🤩 Popular new slots: Rich Wilde and the Tome of Dead (Play’n GO), Big Bass Bonanza 1000 (Pragmatic Play), Vikings Go to Olympus (Yggdrasil)

Progressive slots feature a live top prize that constantly increases with every real money bet wagered on the game until it’s won by one lucky player. These jackpots regularly hit seven or eight figures, and often offer the largest cash prizes available across an entire online casino. For instance, a UK gambler won £13.1 million playing the progressive jackpot slot Mega Moolah in 2015.

🤩 Popular progressive jackpot slots: King Kong Cash Even Bigger Bonanza Jackpot King (Blueprint Gaming), Age of the Gods: God of Storms (Playtech)

Megaways slots were launched by Big Time Gaming in 2015. They use a special reel layout whereby each of the six reels can display anything from two to seven symbols on every spin. Most Megaways slots therefore offer up to a massive 117,649 ways to win, although some such as Rasputin Megaways have nearly three million. Best of all, Megaways games also replace winning symbols, allowing you to land multiple payouts on the same spin.

🤩 Popular Megaways slots: Cash Strike Hotstepper Megaways, The Goonies Megaways, Eye of Horus Megaways (all Big Time Gaming)

High multiplier slots offer the chance to win 100,000x your bet or more, meaning they award the largest payouts relative to your wager size. This is possible because they have in-game bonuses involving huge and progressive multipliers that can significantly boost your payouts, meaning even the smallest bets are capable of landing big wins. They’re often the slots of choice for minimum deposit players wanting to maximise their win potential.

🤩 Popular highest multiplier slots: Tombstone Slaughter: El Gordo’s Revenge (Nolimit City), Starburst XXXtreme (NetEnt), Peking Luck (Pragmatic Play)

The average return to player (RTP) percentage for online slots is around 96%, so any slot with a higher RTP than this can be expected to pay out more money on average. While you may need thousands of spins to notice the benefit, high RTP slots are still popular with players keen to take advantage of the best win rates. Many UK casinos have slot games boasting RTPs of 98% and more.

🤩 Popular high RTP slots: Ugga Bugga (Playtech), Ju Jungle (Casino Web Scripts), 1429 Uncharted Seas (Thunderkick)

Certain slot games allow you to buy in-game bonuses such as free spins at any time for a set price, instead of having to trigger them as normal with scatters. However, online casinos were banned by the UKGC in 2019 from offering such games, as there were concerns they encouraged problem gambling. As a result, you can only play versions of these slots with the bonus buy feature removed.

🤩 Popular bonus buy slots: Gates of Olympus (Pragmatic Play), Sweet Bonanza (Pragmatic Play), Money Train 2 (Relax Gaming)