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Online Slots: Getting started at Casumo

Casumo is a gold mine of online slots. From the classics to the newest titles, you can find everything in our casino lobby.

No matter what slot theme or developer you enjoy most, there’s a title for you, whether it’s a fruit machine, branded slot or big name progressive like Mega Moolah, we’ve got the goods to deliver the gaming experience you’re looking for. And, as we regularly update our collection, you’ll discover the latest titles from the most popular game providers on top of the most iconic spinners of the last decade!

Starting to play is as simple as laying a bet and spinning the reels. But first, you might want to know a little more about how to pick a slot from our gargantuan lobby and the best titles out there.

To provide you with everything you need to start playing, this page covers:

  • The best online slots to play for 2021

  • Why you should play slot games at Casumo

  • The different types of online slots

  • How to pick an online slot

  • How to play and win slots

  • The bonus rounds/features that make up the best online slots

  • And how to play online slots: Online Slots Guide

The Best Online Slots

From The Best Game Providers

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push gaming
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Daily additions... the hundreds of slots available

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Explore all the latest slots available at Casumo, from video slots to jackpots to all the biggest names in the game! 

Best Online Slots of 2021

New slots are released every month, so you’ll always find something fresh and exciting to play at Casumo, but if you’re looking to cut to the chase and head straight to the top titles for this year, then these are the games to start spinning.

Top Online Slots releases of 2021:

Delivering four reel sets in one game, Tomb of Dead Power 4 is an ancient Egyptian high volatility spinner from Blueprint Gaming. Continuing the “book of” franchise, it’s set on 5x4 reels with 3x4 rows in four grids. Each grid comes with 10 paylines and combined, the lowest bet is 20p (5p per grid). The quadrupled gameplay features expanding symbols, bonus spins, scatters, wilds, a prize wheel and a sky-high max win of 50,000x your stake!

Another hit number from NetEnt, Rome The Golden Age, provides players with all of the glory of the ancient empire as you spin the diamond formation reels using wilds, Golden Age symbols, bonus spins and progressive multipliers up to 1,000x to potentially walk away with huge prizes of 100,000x your total stake. It’s a high volatility spinner and a player favourite for the year! 

Are you ready to turn everything you touch into gold? Then this is a slot for you. Based on the fable of King Midas, it’s an action and prize packed game and one of Pragmatic Play’s hottest releases of the year! Featuring 5x3 reels, bonus buy feature, wilds with multipliers, bonus spins with sticky wilds and max wins that come in at a triumphant 5,000x your stake. When you’re ready, set your bets from 20p and start spinning to see if you can turn the reels to gold!

Gates of Olympus is an Ancient Greece themed slot and a captivating high volatility slot. Inclusive of tumbling 6x5 reels that award re-spins on each win, multipliers, bonus spins, and a bonus buy feature: this is a stunning and action-packed affair. What’s more, bets from just 20p! Will Zeus' realm open to you? Check it out and see if you pocket the max prize of 5,000x your bet.

Why Play Slots At Casumo?

As an award-winning casino, Casumo is one of the best places to play slot games. Here’s a few reasons why picking our casino is the top gaming choice:

  • The Casumo slots lobby has a multitude  of the industry’s top slot games to play.

  • You’ll find slots of every kind, that’s new slots, classic, video slots, and Megaways!

  • We add new games to our collection every month and stay on top of the latest gaming trends to bring you the best in online entertainment.

  • There are bet levels and bonus types to suit players of all stripes.

  • We work with the top game providers, including NetEnt, Play’n GO, Big Time Gaming, Quickspin, Red Tiger, and many more!

  • Enjoy daily slot Reel Races and compete head to head against other players to top the tournaments leaderboard and win.

  • All of our slot games are mobile-ready so that you can play on any device

Different Types of Online Slots

Slots come in all sizes, shapes, and bonus types (don’t worry, we’ll take you through the different bonus types and symbols below).

From the earliest style and the start point, the classics, which come with three reels and singular paylines, to the most current releases for this year, Megaways that offer hundreds of thousands of ways to potentially win, here are the main types you need to know about.

The Classics: These were the first online slots created and come with three reels and fewer than ten paylines. Graphically, they’re like the traditional slots you’ll find in Vegas or your local betting shop: paytable on the screen and filled with fruit symbols, liberty bells, and lucky 7s. 

With simplified gameplay, there are no bonus rounds. Match three symbols, and the machine pays. Try spinning Mega Joker, Diamond Duke, and 7’s on Fire for the best classic slots. 

Video Slots: Video slots are more feature-rich and come with cutting-edge graphics. Highly stylised, they have five reels up to 243 ways to win, plus, are packed with bonus rounds and symbols like wilds, scatters, bonus spins, re-spins. 

Video slot themes stretch as far and wide as the creator’s imagination, from branded titles like Anchorman and Bridesmaids to ancient Aztec adventures in Gonzo’s Quest to the American wild west with Dead or Alive. Video slots are a UK player favourite and have been ever since online slots made remarkable improvements.

Fixed and Progressive Jackpot Slots: Jackpot slots are the most interesting games to spin. They can be fixed, where the win amount is set, or progressive, where a percentage of each player’s stake is added to an ever-growing prize pot.

Most jackpot games are video slots, and you’ll win the jackpot by beating the bonus round, adding even more excitement and anticipation to the game. If you’re looking to play for million-pound sums and the hottest jackpot titles, check out Divine Fortune, Mega Fortune, Mega Moolah, Sherlock and Moriarty Wowpot, and Sisters of Oz Wowpot.

Megaways™: Megaways slots are at the forefront of gaming trends right now and offer thousands of ways to win by adapting the number of reel spaces and symbols in play with each spin. That’s right, no two spins are the same, and there’s everything to play for! 

Some of the hottest titles in this department include Bonanza, Buffalo King, Extra Chilli, Vikings Unleashed, and Pirates Plenty.

New Slots: As the slot industry seeks fresh ways to push the genre forward, new slots can come with any number of features and many ways to win! From bonus buy buttons that let you buy your way into a bonus round to new reel setups and even live gaming, the latest releases deliver non-stop gaming action, and there’s no particular one-size-fits-all model! Tomb of Dead Power 4 is a top-notch example of a brand new slot.

How To Choose an Online Slot

Slots are created based on math models, payouts, and different graphic and thematic styles. With so much choice, you’re probably wondering where to start and how to pick the perfect slot. You can use slots stats to understand more about a game before you play and to help you decide. Here’re Casumo’s top tips on how to select a slot to suit your playing style.

RTP: This stands for Return to Player and is the total stakes returned to players over time. For example, if a slot has an RTP of 96%. Across the total stakes, the game returns 96%, and the house edge or casino profit is 4%. 

Slot Volatility: Volatility describes how often a slot game hits a win and the size of the payout. A high volatility slot has payouts that are few and are between but large in size. In contrast, low volatility has more frequent but smaller wins. A medium volatility slot is the perfect blend of both.

Every slot falls into one of these three categories, so if you know how often you like to win and the size of the payouts you expect, you can pick appropriate games.

Bonus Round and Bonus Spins: The paytable is where you’ll find out everything you need to know about a slot game, including whether there’s a bonus round, how to trigger it, and what you can win. If you like a particular type of bonus, then check the paytable of different games to find what you enjoy the most,  or, check for a bonus buy feature! 

Multipliers & Max Win Potential: Every slot game is unique and comes with a different max win. Developers display maximum wins as coin wins or cash amounts. Max wins can vary from $5,000 to $500,000, and you can find this information in the paytable. 

Slot Theme and Design: The last point is the game theme and design. If you’re familiar with slots, you’ll already know that each provider has a different graphic style, and they vary quite considerably to appeal to different audiences.

What’s more, you can find hundreds of different slot themes at Casumo - we’ve already mentioned a few on this page, but some we haven’t covered that are top-rated options include: 

  • Asian

  • Animals

  • Aztecs

  • Pirates

  • Sports

  • Egyptians

  • Adventure

  • TV/Movie branded titles

Just like films or a good book, we all have different genres that appeal, and casino games are no different, so it’s pretty easy to pick your perfect slot game by sticking to themes that you enjoy!

We've got the biggest jackpot slots!

How to play Slots

Make a bet, spin the reels and wait for the symbols to stop. Get three identical symbols on the middle vertical row and win the big bucks!

Easy, right? Well yes, originally slots were that simple, but they are a little more complex than that nowadays.

This page will give you all the information and get you started, explain basic and expert stuff followed by some amazing casino tips.

Slot machine anatomy

Classic slot machines have three reels with only one horizontal payline. Today’s video slots usually have five reels, multiple paylines, special game features and bonus games which gives the player more winning possibilities. These are the common basic parts of a slot machine.

Symbols are images that usually spin vertically. A symbol’s value varies, and usually the more rare it is, the higher the value.

Paylines are paths going across the reels, usually from left to right. Alignment of identical symbols on one or more paylines means win.

Reels are vertically spinning groups of symbols. When they stop, random symbols appear. Slot machines usually have 5 reels.

Spin is the button you click to start the game and get the reels rolling. Similarly, Autospin spins continuously for a specified time.

Coin value and Bet Level both adjust how much you play for per spin. Decreasing or increasing the dials will lower or higher your bet amount.

Paytable is a list of payouts on a slot machine. This shows how many coins or credits the player will win for each combination of symbols.

Winning in slots

Depending on how the symbols fall when the reels stop, you may get a winning combination. Usually you win by collecting three or more identical symbols in a row from left to right. The more paylines a slot has, the greater chance of winning, and the more complete a payline is, the more you win. How you win, and how much you win, is also affected by the various game features and feature symbols that most games have. Check the games’ paytable for detailed information on how to win.

Ways to win

Win left to right

This means you’re winning by collecting identical symbols in a row from left to right.

Slot with this type of win: Fruit Shop

Win Both ways

This means that you can win by collecting identical symbols in a row from both left and right.

Slot with this type of win: Turning Totems

Wild feature symbols


Regular wild symbols replace most other symbols, and makes it easier to form winning combinations on the reels.The only symbol it doesn’t replace is the so called Scatter symbol.

Slot with wilds: Reel Rush

Expanding Wilds

Expanding Wilds will expand and cover the entire reel. More wilds on a reel will increase your winning chances.

Slot with expanding wilds: Starburst

Stacked Wilds

Stacked Wilds means 2 or more wild symbols after each other on a reel, depending on which game it is. Some slot games have the possibility of getting stacked wilds on every reel, while others have them appearing on specific reels.

Slot with stacked wilds: Wild Turkey

Walking Wilds

Walking Wilds progressively move to the side after every respin at no extra cost to the player. They disappear from the reels after reaching the last reel.

Slot with walking wilds: The Invisible Man

Other feature symbols

Except for Wilds, there are a lot of other different symbols with special features. These are some of the most common ones.

Scatter symbols

Scatter payouts multiplies the total bet and not just the line bet. They usually pay out directly when three or more of them appear anywhere on the reels, not necessary on a payline. Scatter is also the symbols that usually trigger bonus games/free spin rounds.

Slot with scatter symbols: Hall of Gods

Colossal symbols

Colossal symbols are symbol blocks of 2x2 or 3x3 which increases your chances to get a complete payline. It appears as an overlay anywhere on the reels and spins separately on top of the reels.

Slot with colossal symbols: Spinata Grande

Bonus game symbols

Bonus game symbols differ from slot to slot and they are often Scatter symbols. They trigger different bonus games that can be described as "a game within the game" in which players have the chance to win extra huge prizes.

Slot with bonus game symbols: Mega Fortune

Game Features

Except the special symbols, there are also some game features that can help you win more. Game features varies from game to game, and so does the terminology among game providers.

Random wilds feature

Random wilds feature means that regular wilds can occur on the reels at any time of the game play.

Slot with the random wilds: Dracula

Gamble feature

Gamble feature allows players to multiply the winnings that they receive on a particular spin. It’s usually activated by allowing the player to guess the correct color of the cards on the next spin.

Slot with the gamble feature: Book of Ra

Respin feature

The respin feature lets you respin the reels on your next spin, helping you complete winning combinations. All of the other reels will be locked in place. Respin comes in many variations, and you can respin all reels on many of the slots. It’s often used with sticky wilds.

Slot with respins: Stickers

Tumbling reels

These are also known as Avalanche feature / Cascading reels / Dropping symbols. As line wins are awarded, the winning symbols disappear, causing symbols from higher up on the reels to fall down into their place. This creates brand new possibilities to win big without risking any additional credits.

Slot with Tumbling reels: Da Vinci Diamonds


Multiplier is a feature that often is combined with tumbling reels. The multiplier simply multiplies your respin win. How many times depends on how many wins you win in a row.

Free Spins

Free Spins are usually triggered by the combination of so called "Scatter symbols", but sometimes in other ways. During these rounds, some more perks can be given, which usually means bigger wins than during the classic gameplay.

Expert stuff

Once you’re familiar with the basics of slot machines, it’s time to take it to the next level. Here are some more advanced slot terms you should learn in order to become a full fledged casino pro.

Hit frequency

Hit frequency is defined as how often a slot machine will have a winning outcome. A hit frequency of 10% means that 1 out of 10 spins has a winning combination. Machines with lower hit frequencies tend to offer larger wins when it pays.

Payback rate (RTP)

Payback is an overall percentage that a slot gives back to all its players. This percentage is usually around 90-99%, depending on the slot.


This basically measures the size of the winnings. Low volatility slots will give you lots of little payouts often, whereas slot machines with high volatility work the other way around.

At Casumo you can play both classic slots and video slots from Net Entertainment, Thunderkick, IGT, Greentube, Play ‘n Go, Quickspin, Williams Interactive, Bally, Barcrest and Shuffle Master. All our game providers have a great selection of high quality games and we’re adding new ones every month.

Top 3 Most Popular Online Slots For UK Players

Online slots are the heart of an online casino and here at Casumo, we’ve got you covered with over 1600 games to choose from. Online slots came a long way since their inception, evolving from simple 3 reel slots to high-tech video slots with cascading reels, free spins features and bonus rounds that will get any slot aficionado off their feet. We’ve shortlisted three of the best UKs’ favourite online slots and the results are in:

Big Bass Bonanza 
Pragmatic Plays’ Big Bass Bonanza online slot is a top favourite amongst UK players. The 5 reel, 10 payline online slot comes with a generous RTP of 96.71% with a free spins feature that keeps on giving. The maximum this online slot can payout is a staggering 2100x your original stake, making it a top favourite amongst UK players. 

If you’ve played slots online before, chances are you’ve come across NetEnt’s classic Starburst slot. With an RTP of 96.06% and a Wild feature that triggers respins, it makes it a top contender for one of UK’s most popular online slots. The ‘win both ways’ feature gives players additional winning opportunities as it pays out for winning combinations from left to right and from right to left. Even after close to a decade after it’s release, Starburst online slot is still a top favourite amongst UK players. 

Jammin Jars
Jammin Jars was a huge release by Push Gaming, an online slot so popular they had to release a sequel, Jammin Jars 2. This online slot has an RTP of 96.8% and if lady luck makes 25 strawberries appear on the reels, you’re in for a payout of 20,000x your original stake. The Rainbow Feature and the Jam Jars multipliers are just a few reasons why the online slot is a hit in the UK. Oh, and there’s a neat free spins feature that makes Jam Jar symbols sticky, resulting in higher wins.