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In this category page, we’ll cover everything you need to know about online slot machines, from the intricate mechanics that make these games so exciting and unique, to the bonus features that bring them to life.

We’ll look at the rules, features, symbols, fairness and more, shining a spotlight on the online gambling industry’s most versatile and sought-after games and going some way to explaining why they are so popular.

You can find hundreds of different real money slot machines at MansionCasino. These vary in size, style, themes, and more—all of which we’ll discuss in this guide.

Slot Machines

Real money slot machines have a variety of reels, paylines, symbols, and features. These all come together to make the games distinctive and to set them apart from the thousands of others out there.

Some of the most common setups are described in examples below:

  • 5 reels; 10 to 20 paylines: These slots are very common and include some of the most popular slots ever created, including NetEnt’s Starburst. They have a fixed number of paylines and a familiar grid, often spread across 3 reels.
  • 243 Ways to Win: These slots essentially create paylines out of every consecutive symbol, thus increasing the possibility for winning combinations. They can occur on many different grid systems. Games include The Dark Knight Rises.
  • MegaWays: Created by Big Time Gaming and licensed to many other developers, the MegaWays mechanic creates a different number of paylines for each spin by randomizing the reels and rows. There can be over 100,000 paylines on some of these games, including Bonanza and MegaWays.
  • Grid Systems: Casino slot machines have been known to use unique grids, from one that begins with one or two rows and then expands to several, to ones that increase and decrease, creating a pyramid shape. One of the most unique slots here on MansionCasino is Finn and the Swirly Spin, whereby all symbols spiral into the centre.

Progressive Jackpot Slots

Some of the most celebrated and sought-after casino slot machines are progressive jackpot slots. These online slots work just like any other game, but with one key difference: A small percentage of each payment is put aside to build a jackpot.

This jackpot steadily builds over time, growing incrementally with each spin taken by each player. The jackpot is then released to one lucky player, after which it resets and the process repeats.

Most progressive jackpots are paid at random and can be triggered during any spin. Some of them are dependent on the state level. In these cases, they will either payout when that level has been reached, or they will pay a percentage of the jackpot to every winner below that level.

Whenever you play slot machines online, you’re tied to a specific set of rules and maximum payouts. Progressive casino slot machines, on the other hand, offer limitless potential, with jackpots that climb to staggering amounts (often in excess of £100,000, sometimes over £1 million) and can be won by anyone.

Take a look at these top jackpot slot machine games available at top UK online casinos:

  1. Mega Moolah
  2. Gladiator - Road to Rome
  3. King of Olympus
  4. Age of the Gods: God of Storms
  5. Age of the Gods: Rulers of Olympus
  6. Age of the Gods: Mighty Midas
  7. Gladiator Jackpot
  8. Age of the Gods: Medusa & Monsters
  9. Furious Four
  10. Age of the Gods: Ruler of the Sky

Online Slots Rules

For the most part, real money slot machines are not complicated. They are designed to be straightforward, ensuring they can be picked up, played, and enjoyed with little fuss or preparation.

However, whether you’re looking to play slot machines for free with a bonus or play with real money, it pays to be prepared. Take a look at these basic rules before you play slot machines online:

  • Bet Sizing: Whether you’re using a slot machine app or playing through your desktop, the first step is to set your stake level. This is done one of two ways:
    • Total Bet – Some slots simplify the bet sizing process by offering a single option for “Stake Size” that you can increase or decrease.
    • Coin Bet – Other slots require you to change the “Level” and the “Coin Size”. In this case, the “Level” essentially refers to the number of coins gambled per line or spin, while the “Coin Size” defines the value of each coin.
  • Symbols: All casino slot machines have a series of unique symbols. These symbols form winning paylines and unlock features, depending on the category they fall into:
    • Basic – These symbols range from “Basic” to “Main”, with the latter triggering the higher payouts. Typically, 3 matching symbols are needed in a single payline to trigger a win.
    • Wilds – A Wild can be used in place of all other symbols, helping to complete winning paylines.
    • Scatter – The Scatter symbol is used to trigger instant wins or unlock bonus features. In most cases, 3 or more are needed, and they can appear anywhere on the reels.
  • Additional Features: These features add an extra dimension to the slot and come in several forms:
    • Bonus Rounds – These features are essentially mini-games where the goal is to make selections and reveal winnings.
    • Free Spins – The average Free Spins feature awards a fixed number of spins, with all winnings accumulated through the feature being released at the end.
    • Random Features – These features are triggered at random throughout the regular play and are often mini versions of bonus features.
  • Game Info: You can find more information relating to a specific slot machine in the game’s Paytable. This contains information about payline numbers and locations, as well as symbols, features, and more.

Online Slots

You should always look for slots that suit your personality and your play style. The goal is to enjoy yourself, after all, and this is much easier to do if you’re actually drawn to the game you’re playing!

Volatility is key as well, but it’s so often overlooked. If you’re planning a short session and you’re the sort of player who is delighted with any kind of return, then a low volatility slot may be preferable. This way, you have a higher chance of getting a return. If you only really care about the big wins and/or you’re planning an extended session, a high volatility slot may be better.

Budgeting is also important. Proper bankroll management is used by everyone from amateur slot players to professional card players. It helps them keep their finances in check, to monitor incomings and outgoings and to avoid losing or risking more than they can afford.

Create a budget, base your deposit and playing sessions on this budget, and then stick to it at all costs!

Software Providers

You can find hundreds of top slots at MansionCasino. These games are provided by some of the biggest developers in the iGaming sector, including Microgaming, NetEnt, Playtech, Realistic Gaming, and Blueprint Gaming.

The developers create the games, they make sure they are safe and fair, and then we host them on our site. This is standard practice throughout the industry and it’s why you’ll see many of the same games across multiple casinos. It means we can focus on what we do best, which is offering big promotions and dealing with your needs, while they can do what they do best, which is creating the best online slots!

Play Online Slots for Real Money

To play slots online for real money, sign up to online casino today, make a deposit, find your game of choice, and start playing! That’s all there is to i

If you don’t have an account with online casino, now is a good time to sign up and join in. Try a Welcome Bonus available to all new players and this is a great way to introduce yourself to our games.

Online Slots Glossary

  • Bonus Feature: An additional game that awards extra features when triggered.
  • Expanding Wild: A Wild symbol that expands into more spaces, filling entire reels and rows.
  • Fixed Jackpot: A set jackpot that does not increase and can be won randomly or via a game feature.
  • Gamble: A feature that can be triggered following a winning payline. It allows players to “gamble” their winnings, often on the turn of a card.
  • Spins: A feature, often triggered by a Scatter, that awards a fixed number of additional Spins.
  • Maximum Bet: A button that automatically sets the maximum stake/line amount.
  • Multiplier: A feature (in the form of a symbol, mechanic, or bonus feature) that multiplies winnings.
  • Nudge: An old-school slot feature that “nudges” the reels to create wins. It’s nowhere near as common on online slots, but it can still be found from time to time.
  • Progressive Jackpot: A jackpot that builds gradually with every spin across all player sessions, before being released at random.
  • Payline: A fixed line on the game-screen. A win is awarded when matching symbols appear in this line.
  • Payout: An amount of money paid to the player following a winning spin.
  • Paytable: An info-pane containing details of the slot, including payouts and paylines.
  • Reels: Vertical lines of symbols that spin randomly. Most slots have 3 to 5 of these.
  • Rolling Reels: A mechanism that can trigger a series of wins following a single spin. The winning symbols all disappear, and new symbols fall into place, sometimes accompanied by an increasing multiplier. Rolling Reels is the term used by Microgaming, but this mechanism is also used by other developers, including NetEnt (Avalanche) and Playtech (Cascading Reels).
  • Scatter: A unique symbol that awards instant wins or triggers bonus rounds when a fixed number appear anywhere on the reels.
  • Sticky Wild: A Wild that locks onto the reels and remains fixed in place for multiple spins.
  • Return to Player (RTP): An RTP is the average payout returned to a player over the course of an extended session. For instance, if a player places 100 £1 bets on a 95% RTP slot, the average expected return would be £95.
  • Themes: The slot theme is the defining aesthetic, whether it be related to a specific movie, piece of music or TV license, a classic “Fruit” or “Jewel” theme, or an original theme based on Fantasy, Sci-Fi, or something else.
  • Volatility: The volatility ranges from “low” to “high”. It describes how often the slot pays-out, with “low” being a slot that pays small amounts frequently and “high” being one that pays larger amounts more infrequently. Volatility is also known as “Variance”, although the latter is typically used to refer to card games like poker.
  • Wild: A symbol that builds winning paylines by substituting for other symbols. The Wild is often, but not always, the biggest symbol in the game and can return fixed jackpot wins when it fills an entire payline.

Online Slots Summary

Our dedicated slot machine app and our vast selection of real money online slots are what makes MansionCasino unique. We have one of the largest and most varied games rooms on the internet and when you sign up and deposit all of these games will be at your mercy.

Make sure you claim your Welcome Bonus if you’re signing up for the first time. If you have any issues, we have extensive help files and FAQs to guide you through and you can also contact our dedicated customer support team via Live Chat (available to all members in the account section), phone and email.