The Most Popular Slots Available at 21.co.uk

One of the most popular of all casino games has to be the online slot game - and there are so many reasons for this. The reason they stand out from the rest is because they come in all different shapes and sizes, with all different themes and a whole host of innovative features.

Here, at 21.co.uk, you can find all sorts of popular variations, from progressive jackpots to classic fruit machines. We have Cluster Pays games, Megaways slots and some of the most popular slot games of all time.

Here you’ll find some of the most popular slots that exist at 21.co.uk.

What makes these slots popular?

Many of our most popular online slot machine games have five or more reels now, with some games having reels that you can unlock as you play - adding dynamism to the experience. That said, there are still many popular options that adopt the classic 3-reel layout. The 5-reel games also come with various numbers of paylines. You can find games with one payline - or there could be hundreds of thousands of paylines. Some games come with cluster pays mechanisms - so you just need to get a cluster of matching symbols to win - and there are some with anyway pays where you need to land matching symbols anywhere on the reels.

Then, of course, there are the bonus rounds and features to consider. The most popular slot games come with wild symbols - from standard wilds to sticky wilds, roaming wilds, expanding wilds and more. We also have the scatters to think about - which generally lead to free spins rounds - where you get to not only spin the reels for free but usually with extra wilds, multipliers and winning potential.

When playing the most popular online slots, you'll find all sorts of bonus rounds, from pick-me bonus rounds to jackpot wheels and more - each feature adding more dimensions to gameplay.

What's more, the graphics and animations have never been better - making the games more immersive than ever before.

Popular Slots to Play Online

Below you can find some of the most popular slots that exist online

Starburst

NetEnt's Starburst is a slot game that is admired for its gorgeous gem symbols and look - and is one of the most popular online slots ever. It is played on a 5-reel grid with 10-pay lines.

The game is masters simplicity which is one of the reasons why it has become so popular.

Rainbow Riches

Then we have the ever-popular Rainbow Riches slot, created by Barcrest, which is as traditionally Irish as it gets. Played on 5 reels with 20 paylines - and with bonus rounds like Road to Riches, Wishing Well, and Pots of Gold, every bonus feature comes with unique ways to win, adding variety.

Wish Upon a Jackpot

The Wish Upon a Jackpot slot opens up the game with 5 reels and 20 paylines. There all sorts of bonus features like Fairy Godmother Spin, Pinocchio Wilds, and the 3 Little Pigs Free Spins.

Book of Dead

There's no game quite as iconic as Book of Dead by Play'n GO, which delivers an Ancient Egypt theme. The game is played on a 5-reel grid and has 10 paylines. The game's main feature is the Free Spins feature, which is triggered by the Book of Dead symbol - which also acts as a wild and scatter.

Fishin' Frenzy

Then you have one of the most recognised deep-sea-themed slot games - Fishin' Frenzy by Blueprint Gaming. This fishing-themed slot game is played on 5 reels with 10 paylines. The game's main feature has to be the Free Spins bonus round, where you'll need to catch fish symbols for cash prizes.

Popular Slot Features

Free Spins

Free spins bonus rounds are found in most of the very best online slots, with games like Immortal Romance II offering all different types - and they're usually triggered by landing 3 or more scatter symbols anywhere on the reels at once. You'll then be awarded a set amount of free spins depending on how many scatters triggered the feature.

What's more, free spins are usually accompanied by other features, such as extra wilds and multipliers, for more diverse gameplay. In many games, you are even able to re-trigger the free spins. Your wins will be totalled up when the free spins round ends and added to your balance.

Megaways

Megaways games, such as Spartacus Megaways, offer a mega number of ways to win. With Megaways slots, there are 6 reels and the number of rows changes with every single spin, which means that the number of ways to win changes with each spin. Most Megaways games can expand up to 7 rows - which means potential ways to win can rise up to 117,649 - sometimes more.

Cascading Wins

Cascading wins add the potential for consecutive winning combinations to be formed - and is one of the standout features of games such as Gonzo's Quest.

Whenever you hit a winning combination, the winning symbols will be removed from the grid, and symbols will cascade into their place - potentially creating even more wins. This continues until there are no symbols. Some games even add multipliers into the mix.