Ultimate Online Slot Games Guide

This ultimate guide to online slot games covers a lot of territories: pay lines, bonus features, themes, and return-to-player (RTP). It’s our job to study the latest online slots on the market and play the games to test them out. Thus, we provide the most detailed reviews and analysis of the latest online and mobile slots on the Internet.

Benefits of Playing Online Slot Games

Online slots are one of the most popular games at casino sites. That is why we are reviewing hundreds of slot games so you can play and win! These are some of the benefits to playing slot games at online casinos, these include:

  • Big Jackpots: Online slots have the biggest fixed jackpots and progressive jackpots.
  • Play for Free: On our reviews you will be able to try popular slot games for free!
  • Bonus Features: 5-reel video slots have wild symbols, scatter pays, free spins, and bonus modes to keep the game exciting.
  • Licensed Themes: License slots have clips and soundbites from your favorite movie, tv, comics, and pop music franchises.
  • Cinematic Graphics: 3D slots have virtual graphics which are entertaining and visually stimulating.

Best Online Slot Casinos

#1 Ranked Online Casino Site

  • 1
    BetOnline Casino
    • Accepts US Players, Highly Recommended
    • Online, Download, Live, & Mobile Casino
    • Over 100 Casino Games
    Deposit Options include:
    • visa
    • mastercard
    • skrill
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    100% up to $3,000
  • 2
    Cafe Casino
    • USA Players Accepted & Mobile-Friendly
    • Big Bonuses and Over 330 Casino Games
    Deposit Options include:
    • visa
    • mastercard
    • debit
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    500% up to $5,000
  • 2
    • Easy Credit Card Deposits
    • 200+ slots + many other casino games
    • Excellent mobile options
    Deposit Options include:
    • visa
    • mastercard
    • wire
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    200% up to $1,000
  • 2
    • Accepts US Players, Highly Recommened
    • Online, Download, Live, & Mobile Casino
    • Over 100 Casino Games
    Deposit Options include:
    • visa
    • mastercard
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    100% up to $3,000
  • 3
    Betway Casino
    • Uses the Microgaming Software
    • Fast Cashouts in Just 1-7 Days
    • Online, Mobile, Instant & Live Play
    Deposit Options include:
    • visa
    • mastercard
    • paypal
    • neteller
    Compatible with:
    • windows
    • apple
    • mobile
    100% up to $1,000
    100% up to €1,000
    100% up to £1,000
  • 3
    888 Casino
    • Operating in Good Standing Since 1997
    • Great Graphics and Sounds that are Updated Frequently
    • Fast and Secure Credit Card Deposits
    Deposit Options include:
    • visa
    • mastercard
    • paypal
    • neteller
    Compatible with:
    • windows
    • apple
    • mobile
    100% up to $200
    100% up to €140
    100% up to £100
  • 3
    Spin Palace
    • Premium 24 Hour Live Support
    • Biggest Progressive Jackpots
    • Safe and Trustworthy Deposit Options
    Deposit Options include:
    • visa
    • mastercard
    • paypal
    • bitcoin
    Compatible with:
    100% up to $1,000
    100% up to €1,000
    100% up to £1,000
  • 3
    Jackpot Casino
    • Big Jackpots and Massive Deposit Bonuses
    • Over 400 Online Casino Games
    • Play Live Dealer Games
    Deposit Options include:
    • visa
    • mastercard
    • paypal
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    100% up to $1,600
    100% up to €1,600
    100% up to £1,600
  • 3
    • Large Australian Bitcoin-Friendly Casino
    • Mobile, Flash, and Download Play Options
    • Fastest Payouts
    Deposit Options include:
    • visa
    • mastercard
    • paypal
    • neteller
    Compatible with:
    • windows
    • apple
    • mobile
    200% up to $1,000
  • 3
    Fair Go Casino
    • Safe and Trustworthy Australian Casino
    • Mulitple Daily Deposit Deals
    • 100s of Pokies, Slots, and Table Games
    Deposit Options include:
    • visa
    • mastercard
    • wire
    • bitcoin
    Compatible with:
    • windows
    • apple
    • mobile
    • linux
    100% up to $1,000

Complete List of Online Slot Games

We are reviewing every single slot game you can find at online casinos so you can have all the information in one place. On each game review you will learn the rules, buttons and special features. As a bonus to our visitor you can even try them all for free!

Top Online Slots Games

Slot Name Theme Reels Paylines Software Casinos
777 Deluxe Logo 777 Deluxe Fruits & Symbols 5 10 RealTime Gaming Cafe Casino
Delicious Candies Logo Delicious Candies Candy 5 5 RealTime Gaming Bovada CasinoCafe CasinoSlotsLV
Dragons Logo Dragons Dragons 5 25 RealTime Gaming Cafe CasinoSlotsLV
Fire & Steel Logo Fire & Steel Video Slots 5 20 Betsoft BetOnline Casino
Giovanni's Gems Logo Giovanni's Gems Video Slots 7 7 Betsoft BetOnline Casino
Good Girl Bad Girl Logo Good Girl Bad Girl Angels & Devils 5 15 Betsoft BetOnline Casino
Sugar Pop 2: Double Dipped Logo Sugar Pop 2: Double Dipped Candy 7 7 Betsoft BetOnline Casino

Below is the complete list of online casino slot games that can be found at top rated casino sites. Click on your favorite game to find out more.

Slot Name Theme Reels Paylines Software Casinos
777 Deluxe Logo 777 Deluxe Fruits & Symbols 5 10 RealTime Gaming Cafe Casino
Aztec Treasures Logo Aztec Treasures Classic 3 30 Betsoft BetOnline Casino
Delicious Candies Logo Delicious Candies Candy 5 5 RealTime Gaming Bovada CasinoCafe CasinoSlotsLV
Dragon Kings Logo Dragon Kings Dragons 6 10 Betsoft BetOnline CasinoMyBookie Casino
Dragons Logo Dragons Dragons 5 25 RealTime Gaming Cafe CasinoSlotsLV
Fire & Steel Logo Fire & Steel Video Slots 5 20 Betsoft BetOnline Casino
Giovanni's Gems Logo Giovanni's Gems Video Slots 7 7 Betsoft BetOnline Casino
Good Girl Bad Girl Logo Good Girl Bad Girl Angels & Devils 5 15 Betsoft BetOnline Casino
Pirate’s Revenge Logo Pirate’s Revenge Pirates 5 9 Digital Gaming Solutions BetOnline CasinoSportsbetting.ag
Pistols & Roses Logo Pistols & Roses 1980s, Western 3 1 Rival Gaming Cafe CasinoSlotsLVBovada Casino
Sugar Pop 2: Double Dipped Logo Sugar Pop 2: Double Dipped Candy 7 7 Betsoft BetOnline Casino

Other Slot Games Soon To Be Reviewed

  • 4 Seasons
  • 5 Reel Circus
  • 5 Times Wins Progressive
  • 7th Heaven
  • 8 Lucky Charms
  • A Christmas Carol
  • A Day at the Derby
  • A Night In Paris
  • A Night With Cleo
  • A Switch in Time
  • After Night Falls
  • Alkemor’s Tower
  • All Aboard
  • Amigos Fiesta
  • Arabian Tales
  • Ares
  • Ares: The Battle of Troy
  • Arrival
  • As the Reels Turn 1
  • As the Reels Turn 2
  • As the Reels Turn 3
  • Astral Luck
  • At the copa
  • At the Movies
  • Atlantic Treasure
  • Atomic Age
  • Aussie Rules
  • Baby Boomer’s Cash Cruise
  • Back In Time
  • Barbary Coast
  • Best of Luck
  • Big Cash Win
  • Big Money Bigfoot
  • Birds
  • Birds of Fury
  • Black Gold
  • Blazin’ Buffalo
  • Blood Eternal
  • Bowled Over
  • Bulletproof Babes
  • Bust-A-Vault
  • Caesar’s Empire
  • Caesar’s Triumph
  • Candy Cottage
  • Cash Money Mermaids
  • Catsino
  • Champs Élysées
  • Charms and Clovers
  • Chase the Cheese
  • Chicken Little
  • Cirque du Slots
  • Cleopatra’s Coins
  • Codename: Jackpot
  • Coins of Olympus
  • Cosmic Quest I: Mission Control
  • Cosmic Quest II: Mystery Planets
  • Costume Party
  • Crazy Camel Cash
  • Cream Of The Crop
  • Crystal Waters
  • Curious Machine Plus
  • Demi Gods
  • Derby Dollars
  • Desert Kingdom
  • Diamon Dozen
  • Diamond Cherries
  • Diamond Dazzle
  • Diamond Dozen
  • Diamond Dragon
  • Diamond Dreams
  • Diamonds Downunder
  • Diggin’ Deep
  • Dino Island
  • Dirty Martini
  • DJ Moo Cow
  • Dog Pound Dollars
  • Doo Wop Daddy-O
  • Dr. Jekyll & Mr. Hyde
  • Dragon Princess
  • Eggstravaganza
  • El Luchador
  • Enchanted
  • Event Horizon
  • Exterminator
  • Fa-Fa Twins
  • Fantastic Fruit
  • Fantasy Fortune
  • Fast & Sexy
  • Fast Lane
  • Fire & Steel
  • Firestorm 7
  • Five Reel Bingo
  • Five Times Wins
  • Five Times Wins Progressive
  • Five-Reel Bounty Hunter Slots
  • Five-Reel Fruity Fortune Slots
  • Fixer Upper
  • Flea Market
  • Flying Colors
  • Food Fight
  • Football Frenzy
  • For Love & Money
  • Forbidden Slot
  • Fortune Keepers
  • Frankenslots Monster
  • Fruit Frenzy
  • Fruit Zen
  • Future Fortunes
  • Genies Fortune
  • Ghouls Gold
  • Gladiator
  • Gladiator Wars
  • Global Cup Soccer
  • Gnome Sweet Home
  • Gobblers Gold
  • Goblin’s Gold
  • Gold Diggers
  • Gold Rush
  • Goldbeard
  • Golden Gorilla
  • Goldenman
  • Good Fishes
  • Grandma’s Attic
  • Great 88
  • Greedy Goblins
  • Gridiron Glory
  • Gusher’s Gold
  • Gypsy Rose
  • Heavyweight Gold
  • Heist
  • Hercules the Immortal
  • Heroes Realm
  • Hobo’s Hoard
  • Hole in Won
  • House of Fun
  • Hydro Heat
  • Ice Picks
  • Indiana Jane
  • Invaders
  • Invasion
  • It Came From Venus
  • It Came From Venus Plus
  • Jack The Ripper
  • Jackpot Jamba
  • Jacques Pot: Gourmet Slot
  • Japan-O-Rama
  • Jenny Nevada & The Diamond Temple
  • Jolly Roger’s Jackpot
  • Jumbo Joker
  • Kawaii Kitty
  • Knights Conquest
  • Koi Garden
  • Legend of the Nile
  • Leonardo’s Loot
  • Lion’s Lair
  • Lion’s Roar
  • Loco 7’s
  • Lost
  • Lost Secret of Atlantis
  • Lucky 7
  • Madder Scientist
  • Major Moolah
  • Mamma Mia
  • Mega Gems
  • Mega Wins
  • Metal Detector
  • Midway Madness
  • Milk the Cash Cow
  • Mister Money
  • Money Magic
  • Moonlight Mystery
  • Moonshiner’s Moolah
  • More Gold Diggin
  • Mr Vegas
  • Multplier man
  • Mystic Wolf
  • Ned and his Friends
  • Nuclear Fishin’
  • Ocean Treasure
  • Ogre Empire
  • Once Upon A Time
  • One Million Reels BC
  • Opera Night
  • Out Of This World
  • Panda Party
  • Penguin Payday
  • Pharaoh King
  • Pigskin Payout
  • Pinocchio
  • Preicous Treasures
  • Psychedelic Sixties
  • Pub Crawlers
  • Puppy Love Plus
  • Queen of Kings
  • Rain Dance
  • Red Sands
  • Red, White & Bleu
  • Reel Blood
  • Reel Circus
  • Reel Crime 1: Bank Heist
  • Reel Crime 2: Art Heist
  • Reel Fighters
  • Reel of Fortune
  • Reel Outlaws
  • Reel Party
  • Reel Party Platinum
  • Reels of Wealth
  • Reign of Gnomes
  • Retro Sci-Fi
  • Rise of Poseidon
  • Robin Hood
  • Rock On
  • Rockstar
  • Roll out the Barrels
  • Ronin
  • Rooks Revenge
  • Royal Reels
  • Safari Sam
  • Samurai’s Path
  • Scary Rich
  • Scary Rich 2
  • Scary Rich 3
  • Secret Garden
  • Secrets of a Geisha
  • Serpents Treasure
  • Sevens & Stripes
  • Sevens and Bars
  • Sevens and Stripes
  • Shamroock Isle
  • Sherwood Forest Fortunes
  • Shopping Spree
  • Silver Unicorn
  • Sin City Nights
  • Six Shot Showdown
  • Slots Angels
  • Snow White
  • Snow White & The Poison Apple
  • Snow Wonder
  • So 80’s
  • Space Traders
  • Spartan Warrior
  • Spy Game
  • Stampede
  • Star Jewels
  • Streetball Star
  • Strike Gold
  • Sugar Pop
  • Summer Ease
  • Super Diamond Mine
  • Surf Paradise
  • Surprisng 7
  • Swinging Sweethearts
  • Tahiti Time
  • Tea Cup Dragons
  • Ten Times Wins
  • Terracotta Wilds
  • The Angler
  • The Back Nine
  • The Bees
  • The Curious Machine
  • The Ghouls
  • The Golden Owl of Athena
  • The Magic Shoppe
  • The Mob Heist
  • The Slotfather
  • The Slotfather 2
  • The Tipsy Tourist
  • The True Sheriff
  • Thunderbird
  • Tiger Treasures
  • Tigers Claw
  • Travel Bug
  • Treasure Island
  • Treasure Room
  • True Illusions
  • Tycoon Plus
  • Tycoon Towers
  • Under the Sea
  • Victory Lane
  • Viking Age
  • Viking’s Victory
  • Vintage Vegas
  • Virtual Racebook 3D
  • Wacky Wedding
  • Watch the Birdie
  • Weekend in Vegas
  • Western Wildness
  • Whale O’Winninings
  • Wheel of Cash
  • WhosPunit
  • Whospunit Plus
  • Wild Carnival
  • Wild Safari
  • Wild Wild Spins
  • Wind Mill
  • Winter Wonders
  • Witches and Wizards
  • Wizards Castle
  • World of Oz
  • Zobiezee Money
  • Zombies Vs Cheerleaders
  • Zombies Vs Cheerleaders II
  • Zombiezee Money

Show More ↓ Show Less ↑

How to Find the Best Online Casino to Play Slot Games

Before you choose an online casino for real money play, there are a few factors to take into consideration. We’ll recommend the best online casinos for US slots players, but you want to do your own analysis based on your needs. Here’s a quick checklist to help you decide on the best slots site for you.



Sites need 128-bit SSL encryption to assure payouts are safe, a professional verification process, and the kind of payment methods which protect your identity.

Reputable Casino

Reputable Casino

It doesn’t matter if you win big if the casino operator doesn’t pay out your winnings — or pay them in a timely fashion. We recommend famous and reputable casinos.

Return to Player


A games RTP is important because this is the return you can expect. If two games are similar but one’s RTP is 97% instead of 93%, that’s important.

Game Selection

Game Selection

Most slots players get bored with the same games all the time, so you want an online casino with scores or even hundreds of online slots.

Favorite Slot Game Type

Favorite Game Type

5-reel video slots have a lot of bonus features, pay lines, and big jackpots. 3-reel classics have traditional themes and frequent hits of fixed jackpots.

Reputable Software Providers

Favorite Software Provider

Different slots developers have different strength. RealTime Gaming has lots of random jackpots and big progressive slots. Rival Gaming has lots of bonus features and interactive bonus games. Betsoft has fun themes and good graphics.

Best Online Casinos to Play Online Slot Games

When looking for places to play online slot games on the internet you are likely to find hundreds of sites promoting the best games. We encourage visitor to only play at recommend online casinos to avoid any scams. The following USA friendly online casinos have the best combination of slot bonuses, games selection, safety, and dependability.

Rank Casino # of Slots Bonus
#1 Slots.LV Online Casino LogoPlay at Slots.lv 194 Bitcoin Bonus $7,000
Welcome Bonus $5,000
Weekly Double-Up Bonus $100
#2 betonline casinoPlay at BetOnline 99 Slot Bonus $1,000
Slot Scramble $25,000
#3 Cafe CasinoPlay at Cafe Casino 200 Slot Bonus $5,000 (CAFE500)
Bitcoin Welcome Bonus $6,000 (CAFE600)
No/Max Cash-out Welcome Bonus 100% (CAFE100)
#4 Bovada logo smPlay at Bovada 203 Bitcoin Welcome Bonus $5,000
Casino Welcome Bonus $3,000

How to Play Online Slot Games

Follow this step-by-step guide to playing online slots in a few easy steps. If you’ve ever played a slot machine in a brick-and-mortar casino, then the adjustment period will be short. Game developers design the online slot controls to mimic electronic slots in land-based casinos. In case you need a refresher, follow these four easy steps.


Pick Your Favorite Slot Game

Choose a title from the big list of slots in the online casino. Most sites have sections like 5-reel slots, 3-reel slots, and progressives.


Select Coin / Bet Size

Before you click “Spin”, use the bet size control to choose the right denomination. Play the max bet of 5 coins, but lower the denomination to the bet size you find comfortable.


Select Paylines

Most online slots have staggered payouts, so choose the max pay lines to activate the biggest jackpot. Once again, adjust bet size down if the max pay lines make you uncomfortable.


Hit the Spin Button

Now that you have the coin denomination and max pay lines right, hit “Spin” to get your results. Follow these steps again and again throughout the slot session.

Playing Online Slot Games for Free

Can you play online slot games for free? Yes! If you haven’t figured out which slots game to play, most online casinos offer a free version of the game. On our slot game review, you will be able to play all the games for free. That way you can give the game a try before playing for real money.

How to Play Online Slots for Free

Playing for slot games for free at your favorite online casino is simple. Just follow these easy steps:

  • Step 1: Visit a recommended online casino.
  • Step 2: Find the slot section
  • Step 3: Search for your favorite slot game and click on the title,
  • Step 4: You’ll be asked whether you want to play for real money or play in practice mode
  • Step 5: Choose the practice play before actually paying to play.

Practice play is beneficial because you can learn the game controls and bet denominations before spending your hard-earned cash. Also, if the slot’s theme isn’t entertaining or annoys you, then you can find a better mobile slot to play.

Strategy to Play Online Slot Games

Las Vegas and Atlantic City casinos are experimenting with skill-based slots, but online slots do not require skill to play. Though slots games are games of chance, that doesn’t mean a player can’t benefit from a few helpful strategy tips. Follow these strategies when you begin to play slots online to save yourself some money. The more spins you play, the more chances you have to win a life-altering jackpot.

  • Max Out Slots Bonuses: Most online casinos these days tailor welcome bonuses, reload bonuses, and weekly bonuses for slots. Read about casinos’ promotions and strategize how to max out your bonus cash.
  • Read RTP Percentages: Play online slots with a higher return-to-player percentage. Simply by playing a game with a better-expected return, you save yourself money while you play.
  • Calculate the Breakeven Point: Progressive jackpot slots have a point where the pot becomes so big that the game has a positive expectation. While this doesn’t increase the odds you’ll win, it does mean that you’re playing a slot with a good gamble.
  • Use Money Management: Learn about basic money management techniques. Bankroll calculation, loss limits, and win goals won’t change the odds, but they will save you money during your gaming sessions.

Types of Online Slot Games

Online casinos have a wide variety of video slots available. Read through the list of slot games you might encounter as you get into the world of slots play online. Game designers sometimes mix and match concepts, so some of the online slot types below aren’t mutually exclusive.

  • Classic/Fruit machines/3 Reel

    Classic 3 ReelCalled 3-reel-spinners, classic slots, or fruit machines, these were the original games with 3 reels and 1 pay line. Fruit slots were so-called because their reel symbols were fruit or other basic symbols.

  • 5 Reel Slots

    5 Reel Slots5-reel slot machine came about when electronic slots were invented. These have more reels, more pay lines, and thus bigger jackpots.

  • Video Slots

    Video SlotsVideo slots use a video screen for more interesting graphics and themes. 5-reel video slots are the most popular slots because they use cutscenes, video clips, and interactive bonus games.

  • 3D Slots

    3D SlotsThe ultimate in video slots, 3D slots have 3D graphics that pop off the screen. 3D slots might portray movie scenes or have reel symbols that seem to come off the screen.

  • Multiplier Slots

    Multiplier SlotsMultipliers are popular because they increase the size of the jackpot by 2x or 100x their original value. Some multiplier jackpots have reached $100,000 or more.

  • Licensed Slots

    Licensed SlotsA slot machine based on a pop culture franchise. You can play slots while being entertained by your favorite movie, tv, or comics characters — or musical acts.

  • Multi-Line Slot Games

    Multi Line Slot GamesPaylines are a way to increase the jackpot. Video slots often have 9 lines, 15 lines, 25 pay lines, or even 50 to 100 winning lines.

  • Progressive Slot Games

    Progressive Slot GamesInstead of a fixed jackpot, the top prize increases over time. Every time a player spins and doesn’t win the jackpot, the accumulated pot grows.

  • Wide-Area Progressive (WAP)

    Wide-Area Progressive SlotsThe biggest progressive slots there are. Dozens of online slot games feed into the same jackpot, increasing it at a fast and exciting pace.

  • Poker Machines

    Poker Machine SlotsThis is the Australian name for slot machines. Many Australians call these the pokies.

  • Virtual Reality Online Slot Games

    Virtual Reality Online Slots GamesOnline slots which require a VR headset. Virtual reality slots take graphics and bonus games to the next level with immersive videos.

  • Mobile Slot Games

    Mobile Slot GamesSlots delivered to your smartphone or tablet computer screen with a downloadable mobile app. Slots played on Android phones, iPhones, and iPads for players on the go.

Understanding Slot Volatility and RTP

Online Slot Volatility and RTPSlot players don’t need an advanced degree in mathematics to play, but it helps to learn the basics of probability as it applies to slots. Return-to-player (RTP) is important for determining which slot machine is best. The RTP is the expected payout expressed as a percentage. If a slot machine has an RTP of 97%, you can expect to win back $97 for every $100 wagered. If the RTP is 101%, then you can expect to win back $101 for every $100 wagered.

The higher the RTP, the better the slot machine. An RTP greater than 100% is a positive expectation slot, which almost never happens unless you play a progressive slot with a jackpot which has surpassed the breakeven point. An RTP less than 100% is a negative expectation slot. With a negative expectation slot, if you subtract the RTP from 100%, you get the house edge. For an online slot with an RTP of 97%, the house edge on the game would be 3%.

What Is Slot Volatility?

Online Slot VolatilityVolatility is another concept slot players need to understand. We talk about theoretical expected return, but in practice, each slots session is likely to deviate from the RTP somewhat. Volatility is how much a game tends to deviate from the RTP. As a general rule, slot games with high payouts but low return-to-player tend to have a high volatility.

Slots with fixed jackpots tend to have a high RTP, which is why some players prefer 3-reel classics. These games are less volatile, meaning you’re more likely to have winning sessions and hit the jackpot more often. Playing slots with high volatility, you’ll have more losing sessions but tend to win bigger jackpots when you do win.

The important thing with volatility is it’s neither good nor bad. Some players want a game with high volatility because bigger jackpots are what they want. Some players prefer low volatility because they want more winning sessions and better odds. Learn what you want, study slots’ volatility, and you’ll pick slot games you like more often.

Online Slots Glossary

When it comes to playing slots online, it is very important to know all of the terms so you have a good idea of what all the features, buttons and prizes mean. We have compiled a complete list of all the terms that will help you play slots like a pro.


A feature which lets players set the machine to spin without hitting the “Spin” button. Players can set 1 to 100 automatic spins on most games with autoplay.

Bonus Game

A common feature on slot machines, this triggers a game-within-a-game which is often interactive. Spins stop for a time and the player makes decisions to get bonus coins without risking money.

Coin size

Slots have different coin denominations so you can vary the bet to your comfort level. Use the (^) or (v) buttons to adjust your bet size.

Fixed Jackpot

A set amount a player wins if they hit the jackpot combination. This is the traditional payout in slot machines, also called a flat-top slot.

Free Spin

A bonus feature allowing players additional spins without risking coins. Free spins often activate when 2 or more scatter symbols appearing on the reels, with more scatters meaning more free spins.


A slang term for a winning spin on a slot machine.


The largest prize on a slot machine. Slots with fixed jackpots are called flat-top slot machines, while slots with accumulated jackpots are called progressive slot machines.


Also called pay lines, these are reel combinations which trigger wins. The common numbers for pay lines are 1 line, 3 lines, 9 lines, 15 lines, 20 lines, 25 lines, 30 lines, 50 lines, or 100 lines, but any number is possible.

Max Bet

This is the maximum wager you can make on a slot machine. Often, a player has to make the max bet to unlock the top jackpot.


The multiplier feature multiplies the size of a bonus or jackpot by a factor of 2x or more. Some multipliers go as high as 100x the bonus, but most are between 2x and 10x.

Pay line

A winning pattern on a slot machine. Slots might have 1 pay line or 100 pay line, but if it’s activated and the symbols align in the pattern of a pay line, you win money.

Payout Percentage

The probabilistic percentage a player can expect to win back when the player. Also called the RTP. You might win more or less than the expected payout, but this is what you should expect to win when playing a game.

Progressive Jackpot

The biggest type of slots jackpot. The progressive pot continues to grow until somebody wins it, often building into the millions of dollars.

Random Number Generator

Also called an RNG, the random number generator is a computer chip which determines random results on an electronic slot. RNGs have been used for 40 years and are a proven technology.


The spinning wheels that contain symbols. Most slots have 3 reels or 5 reels, though 6-reel and 7-reel slots exist.

Scatter Symbol

Scatter symbols can appear anywhere on the reel to give the player benefits. Scatter pays give random payouts, while scatter symbols unlock bonus games or free spins.

Slot Type

A term describing a broad category of a slot machine: licensed slots, electronic or machine slots, 5-reel or 3-reel slots, progressive or fixed slots, or Class II (tribal) or Class II (Vegas-style) slots.

Staggered Payout

A slot machine which offers a bigger percentage payout when you bet more coins. A 1-coin jackpot doesn’t pay the full jackpot, so you need to bet 5 coins.


These are the icons on reels, often tied to the theme of the game. Match enough symbols and you receive a prize.

Ways to Win

Instead of pay lines, slot machines which have other winning combinations. Began with “243 ways to win”, but now have “1028 ways to win” slots.

Wild Symbol

Wild symbols can replace any other symbol (except scatters) to build a winning combination. Online slots have all kinds of wild symbols: wild multipliers, stacked wilds, expanding wilds, trailing wilds, sticky wilds, and cascading wilds are just a few examples.

Why Play Online Slots

Slot machines have been the cornerstone of casino gaming for decades, and now you can experience them in all their glory at online casinos! With hundreds of slot games, themes, and features, you will have endless hours of fun, all while winning the big jackpots.