The UK's Favourite Online Slots

Video slots dominate the UK online casino landscape, offering endless variety from simple three-reel classics to complex multi-feature adventures. Our selection highlights the 20 most popular slots among British players in 2025, based on search volume, player feedback, and casino prominence. Each slot is available at multiple UKGC licensed casinos reviewed on CasinoEng.

When choosing slots, consider the Return to Player (RTP) percentage, volatility level, and bonus features. Higher RTP means better theoretical returns over millions of spins, whilst volatility indicates risk level—high volatility slots pay bigger but less frequent wins. Features like bonus buys, multipliers, and expanding wilds add excitement and winning potential.

Top 20 Video Slots

Hand-picked selection of the most entertaining and popular slot games

Sweet Bonanza Slot by Pragmatic Play

Sweet Bonanza

Pragmatic Play

RTP: 96.51% High Volatility
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Starburst Slot by NetEnt

Starburst

NetEnt

RTP: 96.09% Low Volatility
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Book of Dead Slot by Play'n GO

Book of Dead

Play'n GO

RTP: 96.21% High Volatility
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Rainbow Riches Slot by Barcrest

Rainbow Riches

Barcrest

RTP: 95.00% Medium Volatility
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Big Bass Bonanza Slot by Pragmatic Play

Big Bass Bonanza

Pragmatic Play

RTP: 96.71% High Volatility
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Gates of Olympus Slot by Pragmatic Play

Gates of Olympus

Pragmatic Play

RTP: 96.50% High Volatility
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Mega Moolah Progressive Jackpot Slot

Mega Moolah

Microgaming

RTP: 88.12% Progressive
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Gonzo's Quest Slot by NetEnt

Gonzo's Quest

NetEnt

RTP: 95.97% Medium Volatility
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Dead or Alive 2 Slot by NetEnt

Dead or Alive 2

NetEnt

RTP: 96.82% High Volatility
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Reactoonz Slot by Play'n GO

Reactoonz

Play'n GO

RTP: 96.51% High Volatility
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Bonanza Megaways Slot by Big Time Gaming

Bonanza Megaways

Big Time Gaming

RTP: 96.00% High Volatility
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Wolf Gold Slot by Pragmatic Play

Wolf Gold

Pragmatic Play

RTP: 96.01% Medium Volatility
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Money Train 3 Slot by Relax Gaming

Money Train 3

Relax Gaming

RTP: 96.10% High Volatility
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Immortal Romance Slot by Microgaming

Immortal Romance

Microgaming

RTP: 96.86% Medium Volatility
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Eye of Horus Slot by Blueprint Gaming

Eye of Horus

Blueprint Gaming

RTP: 96.31% Medium Volatility
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The Dog House Megaways Slot by Pragmatic Play

Dog House Megaways

Pragmatic Play

RTP: 96.55% High Volatility
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Jammin' Jars Slot by Push Gaming

Jammin' Jars

Push Gaming

RTP: 96.83% High Volatility
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Thunderstruck II Slot by Microgaming

Thunderstruck II

Microgaming

RTP: 96.65% Medium Volatility
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Fire Joker Slot by Play'n GO

Fire Joker

Play'n GO

RTP: 96.15% Low Volatility
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Sugar Rush Slot by Pragmatic Play

Sugar Rush

Pragmatic Play

RTP: 96.50% High Volatility
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Understanding Slot Game Features

Modern video slots incorporate numerous features beyond basic spinning reels. Understanding these mechanics helps you choose games suited to your preferences and playing style.

Megaways Mechanic

Developed by Big Time Gaming, Megaways offers a dynamic reel system where each spin produces a different number of symbols per reel. This creates up to 117,649 ways to win on a standard 6-reel setup. Licensed by numerous providers, Megaways slots have become incredibly popular among UK players seeking high variance action.

Cluster Pays

Instead of traditional paylines, cluster pay slots award wins when matching symbols connect in groups of five or more. Popular cluster pay games include Reactoonz and Jammin' Jars. The mechanic enables multiple wins per spin through cascade features that remove winning clusters and drop new symbols.

Bonus Buy Feature

Many modern slots allow players to purchase instant access to bonus rounds rather than waiting for trigger symbols. While this costs significantly more than regular spins (typically 50-100x stake), it guarantees bonus features immediately. Note that bonus buy features are disabled on UK licensed casinos due to UKGC regulations.

Progressive Jackpots

Games like Mega Moolah accumulate jackpots across all participating casinos. A small percentage of each bet contributes to the prize pool, which continues growing until someone wins. While base game RTP is lower on progressives, the life-changing jackpot potential attracts many players.

Ready to try these popular slots? Visit our recommended casinos to find the best places to play with welcome bonuses and fast withdrawals.

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All slots available at our recommended UKGC licensed casinos

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