Online Slots - The Ultimate guide for online slot machines

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What Are Slot Machines and How Do They Work?

Online slot machines are traditional versions of Casino games. We offer the best casino games, they provide payouts that are generally higher than land Casino games. This particular section of casino games has drawn a huge fan base in India and abroad. 

Online slots at Casumo

Casumo has over 850 kinds of online slot games.  Some of its best slot games are Fishing Frenzy, King of Slots, Slot Dice, Slots of Gold, Fruit Slot, Volatile Slot, and many more. Casumo has both classic slots and video slots backed by powerful software like Net Entertainment, Thunderkick, IGT, Greentube, Play 'n Go, Quickspin, Williams Interactive, Bally, Barcrest, and Shuffle Master.

Online Slots Compared to Land Based Slots

Online slots are a version of land-based slot games. However, there are still some differences between the two. Unlike land-based slots, online slots are available everywhere and anywhere. No climatic change or holidays can stop you from gambling online. You can play whenever and wherever you want to. You don't have to dress up for the occasion or travel to a specific location for a game. There is no time barrier, and you don't have to be worried about crowds or noisy rooms. There are no limitations to playing only on a single platform. You can also play on your mobile phone if you don't have a computer. 

Another interesting thing is that online slots provide way more bonus than land-based games. This is why more players are attracted to online slots rather than paying the expenses of traveling to a real Casino. 

Types of Slot Machines

There are different types of slot machines. Some of the most popular versions are below:

3 reel classic slots

Most of the casinos around the world offer 3 reel slots. Even if the game has quite an old-fashioned look and feel, it still remains to be one of the most incredibly popular games. This is because the payout in these games is really good, and they provide a huge adrenaline rush when they hit.

5 reel slots

One of the factors contributing to the popularity of 5 reel slots is that it creates more winning combinations and increases a player's chance of hitting. Even then, as it goes with every other slot game, here too, the payouts are decided by the chips in the game. In a statistical manner, small ones are more frequent than huge ones. Luck is a common contributor to winning. The game uses random number generators, and there is no telling who wins the game. You can either have hot winnings or lose coldly.

Progressive slots

Progressive slots are known to offer jackpots. These jackpots 'progress' with every bet a player makes until someone wins. As soon as someone wins, the jackpot resets to the starting value and starts increasing again. The amount of the bet that the jackpot rises with is also decided by the percentage of action on the machine.

Video slots

One of the most popular computerized versions of slots is the video slot game. This version is basically a digital version of land slots. However, the difference between the two is that video slots come with a wide variety of additional features like scatter symbols, bonus features, and wilds.

Mega spin slots

In very simple terms, mega spin slots can be defined as slot machines that boast multiple sets of reels of different types in one. This is why this is one of the most entertaining forms of online slots.


As the name suggests, multipliers are slot games with unique features that career around the ability to multiply your winnings in a predetermined figure. The aim of the game is to increase your winnings by many folds. 

Multi-Payline Slots

Multi-payline slots are online slots where players can play for more lines and symbols. They need to gamble more with each spin so that they can hit the perfect jackpot. This game also gives you access to some of the best bonus features. You can win free spins, instant wins, or any feature of The Wheel of Fortune.

3D Slots

3D slots are the new variant of slots in this generation. It has marvelous HD visual effects, high-quality soundtracks, and a decent storyline. The characters may seem like leaping out of the screen, and the symbols look like they are spinning in a three-dimensional form. 

Popular Slot Machine Software Providers

Good software is the deciding factor for whether the website is worth investing in or not. The following powerful software makes any online casino trustworthy and reliable:


Cutting-edge, commitment to quality and innovation - that's what Playtech is all about! Since the company's kickoff in 1999, its approach has always been centred on the development of top-notch gaming products and content. This industry leader has now grown into the largest online gaming software supplier traded on the London Stock Exchange with offices in 19 locations worldwide.



NetEnt is a company from Sweden. It is one of the biggest organizations that provides a combination of licensed and original games. This is one of the best software to be installed for gamblers. It also has some of the best progressive jackpots you can find globally.



Microgaming has been one of the biggest names when it comes to casino software. The company thrives because of its heavy influence and high-quality performance. It is one of the most trusted software when it comes to choosing a legitimate website for gambling.

Microgaming India


Play'n Go is widely known for providing excellent mobile software services. It is also found on online Casino websites for smooth functioning.



IGT, IGN, or International Game Technology is a marvelous company providing slot software development. The company has contributed to developing some of the best slot games that you can find in online casinos.



Quickspin is a wonderful software developer for slot games and Casinos. The company is from sweet in and has been recently introduced in the world of casinos. It has so far been successful in entertaining gamblers around the world and has been the pride work of skillful engineers.


What are the most popular/favorite Online slots in India?

Book of Dead

The Book of Dead is probably one of the most popular slot games in India. The game uses play'n Go software services. Gamblers can book this slot game and enjoy various features like interesting themes, free spins, and other such exciting deals. It has scored its place in the topic because of its popularity in India.

Jurassic Park Slot

The Jurassic Park slot has become the hub of interest for Indians. The software provider of this game is Microgaming, which means it is quite a trustworthy game. This lot is based on themes like movies and provides 3D graphics to raise more interest in the players of India.

Thunderstruck II

Thunderstruck II is also one of the most popular slot games in India. Its specialty is that it has the ability to offer various huge, free bonuses as rewards around the globe. It has been one of the best attractions for both new and old players.

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: Koi Princess

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: Jammin Jars

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: Fat Rabbit

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: Matsuri

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: Piggy Riches

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: Spartacus

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: Gigantoonz

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: Lady of fortune

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: Gonzo’s Quest


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.

Slots Terms and Glossary

  • Rtp
     It is a percentage of the total money a player wagers that is paid back by the slot machine to the players. The total is calculated after thousands of spins.


  • Pokies
     Pokies or pokie machines is the Australian term for slot machines.


  • Multi spin
    Multi spin are slots having multiple play lines. With every line, the wager increases, and it gives race to the chances of winning. 


  • Fruit machines
     It is a gambling machine that uses coins and produces random combinations of various symbols. These symbols are generally pictures of different fruits.


  • High roller
     Any player who gambles a large amount of money is called a High roller.


  • Bonus games
     These offer large jackpots to attract players.


  • Active Payline
     The current play that will result in a payout if it has the winning combination. Those with multiple paylines generally offer players a chance to choose how many pay lines they wish to keep active. 


  • Auto Play
     When the player spins the reels for a certain number of times automatically without pressing any button.


  • Bet Max
     Betting the maximum number of lines and the maximum amount on the current line. 


  • Bet Per Line
     The amount per line that is multiplied by the total active paylines meant to determine the total bet for each spin. 


  • Bonus Feature
     Features that give the player a chance to win in a bonus payout or to earn free spins.


  • Classic Slot
     A traditional slot game that contains 3 reels and just one payline


  • Coin Size
     Amount wagered on every spin that is measured via the number of coins to determine the worth of each coin.


  • Fixed Jackpot
     A fixed amount of jackpot that is won at a time.


  • Free Spins
     Spins where gamblers can score winnings without paying for it.


  • Hit
    Synonyms slang for a winning spin.


  • Loose Slot
     Synonyms slang for a slot game with a high payout.


  • Mechanical Slots
     Slots having traditional physical reels rather than virtual ones.


  • One-Armed Bandit
     Synonyms slang for slot machines. 


  • Pay-line
     A specific line which goes across the reels. It has symbols appearing and winning combinations that give you a payout.


  • Payout Percentage
     The total percentage kept on stakes for a slot to pay out over time. 


  • Pay Table
     The total possible winning combinations on a slot machine along with the payouts.


  • Progressive Jackpot
     A jackpot that increases with every bet you wager.


  • Random Number Generator
     A computer-generated program that determines where the reels will stop with each spin.


  • Reels
     The rotating stripes where different symbols appear to determine a winning combination.


  • Scatter
     Symbols that don't need a specific combination on any active payline for a win. They are also used to activate bonus features.


  • Symbol
    The different symbols drawn on the reels to determine a winning combination.


  • Tight Slot
     Synonyms slang for a slot game with a low payout percentage.


  • Wild Symbol
     Symbols that are meant as a substitute for other symbols to create a combination to win.


  • Winning Combination
     A combination of symbols that give you a payout.


How often does an online slot machine hit the jackpot?

Is each reel on an online slot machine random?

How do Free Spins work?

What is a welcome bonus, and how do I use it to play slots

Are online slots really random?

Do Online casinos change the payout on slot machines?

What is the difference between class II and class III slots?

Can you cheat a slot machine?

Do online slot machines vary from casino to casino?