Mercy of the Gods
Mercy of the Gods

What Are the Best Online Casinos for Slots in the US?

Are you a slot lover? Look no further. We’ve come up with a list of popular slots and where to play them. We considered several aspects such as bonuses, mobile compatibility, and support from top game manufacturers.

Online Slot GameBest Casino To Play In
Mercy of The GodsCaesars, Borgata, Unibet
Cleopatra IIBetMGM
Gonzo’s QuestBetMGM, Caesars
Atlantis MegawaysBorgata
Thunderstruck IIBetMGM, Borgata
Book of DeadBetMGM, Borgata
Clue Cash MysteryUnibet, Borgata, BetMGM
ReactoonzBorgata, BetMGM
How to play online slots
How to play online slots

Online Slots Real Money vs Free Slots 

The beauty of online slots is that you choose how you want to play. There are some games you can only play after putting in real funds, which is the most common way of enjoying casino games. But you can also opt to play for free, just to get a feel of what the game is about. The option you pick is entirely up to you. 

What are Online Slots? 

Online slots are random number generator casino games (RNG-operated), where you spin the reels and hope your luck coincides with a win. They are the virtual adaptation of standard fruit slot machines you see in land-based casinos. 

Slots are a popular favorite because they carry a wide range of themes and offer engaging gameplay. Most players can’t stay away because of how simple they are. 

Advantages of playing Online Slots with real money 

Some perks of playing online slots for real money include:

Advantages of playing Online Slots for Free 

On the flip side, you can enjoy slots for free and benefit from the following:

Click here to learn where to play slots for free!

Are Online Slots Safe To Play?

Online slots should be played for entertainment purposes, and not as a get-rich-quick scheme. We encourage all players to play responsibly.

For more information on responsible gambling, visit our page here

Are Online Slots Legal in the US?

With so many certifications and regulators, players can feel confident that playing at legal online casinos in the US is safe and secure. And we assure you that we only promote casino sites that operate under regulated jurisdictions.

Click here for a full list of Gambling Licenses.

Are Online Slots Fair?

The best online slots are safe to play at any legal casino in the US. And to guarantee that all game outcomes are fair and random for all players, state agencies regulate and give licenses to casinos using random number generator (RNG) software. 

In addition to being heavily monitored, licensed, and regulated by state and federal government agencies, many operators also use third-party agencies to certify their games’ fairness and monitor their software over time.

Why Play Slots Online?

Playing in the comfort of your home is one of the biggest benefits of playing online slots. But there’re other advantages such as game availability, attractive rewards, easy payments, flexible stakes, and others. Learn more with the table:

Online SlotsSlot Machines in Landbased Casinos
Play from your home
Variety of games

When you play online, you simply pick the game you want to play. There’s no need to wait for your slot machine to become available as you do in land-based casinos. You’ll also find more attractive bonuses when playing online but also free spins, cash rewards, etc.

All The Slots Types

3-Reel Slots93.98% – 95.06%x1000 – x2500
5-Reel Slots95% – 99.1%x500 – x60000
7-Reel Slots96%-98%x2000
Classic Slots93.98% – 95.06%x1000 – x2500
Multi-Payline Slots96% – 98.8%x10000 – x60000
Bonus Buy Slots94% – 97.7%x1000 – x13000
Progressive Jackpot Slots96.1% – 96.6%x500 – x2841
Megaways Slots95.7% – 97.7%x500 – x80150

3-Reel Slots 

Triple Diamond 1
Play Triple Diamond Slot

3-reel slots are also described as classics because they’re digital representations of physical slot machine games that have been popular for decades.

Symbols are spread across three reels and, in general, these slots have between one and five paylines. Their no-fuss dynamics make them popular with those that love action. Red, White, & Blue is an example of a popular 3-reel slot. 

5-Reel Slots

Big Win on Gonzo's Quest
Win Big on Gonzo’s Quest

5-reel online slot machines are the bigger brother of 3-reel spinners. The addition of two extra reels brings more symbols and paylines to the party.

This creates more opportunities in terms of ways to win, payout potential, and bonuses. One of the most popular 5-reel slots you’ll find is Gonzo’s Quest

6-Reel and 7-Reel Slots

Just when you think the game creators can’t possibly keep adding to the excitement, they do. You can find slots today with even six or seven reels. Usually the more reels, the more chances you have to win. 

Classic & Fruit Slots

Fruit slots are, as you’d expect, filled with fruit. These games typically fall into the classic category as well as the 3-reel category.

There are fruit slots with 5 reels. However, these nostalgic hits usually have 3 reels packed with cherries, lemons, oranges, and other juicy treats.

Fruit Shop is a popular fruit slot you can find at multiple online casinos. You can read our review of the Christmas edition here

Progressive Jackpot Slots

NetEnt Divine Fortune Slot
Divine Fortune Progressive Slot

The big dogs of the slots world are progressive jackpot games. The appeal of jackpot slots is obvious. Alongside fixed prizes, these games have progressive prize pools that continue to grow until someone wins.

A small amount from everyone’s bets is added to the pot, which means you could win $1 million+ from a spin costing less than $1!

You can find many exclusive progressive slots at all the best slot sites in the US. 

Megaways Slots

BTG Megaways Slots
Megaways Slots Brought to you by Big Time Gaming

One of the latest innovations in casino gaming is Megaways. This technology was developed by Big Time Gaming and now it’s being applied to many of the industry’s biggest hits.

The defining feature of Megaways is that it adds a random payline system to a slot.

Each time you spin, the number of ways to win changes. Depending on how things line up, you could have 117,649 ways to hit winning combos! Monopoly Megaways is a popular version of this type of slot. 

Multi-Payline Slots

Slot Paylines 1
Slot Paylines on Book of Ra

Real money slots online have just one payline for you to match the symbols on. Today, slot games have multiple paylines, some will even let you match left-to-right and right-to-left.

These extra ways of matching decrease the risk and increase the thrill of playing. 

Bonus-buy Slots

Bonus-buy real slots online allow players to buy a bonus game directly in the game. While the initial buy can be expensive, players might find that they saved money in the long run by not having to spin the reels to earn the bonus game. You can learn more about bonus-buy slots here

7 Steps To Master the Game of Slots

How to win more on slots

Many casino games take a certain amount of skill to play. But playing slots is more a matter of luck. This is especially true with online slots as they use RNG software to guarantee that the outcome is always random. 

But here are some things you can do to increase your chances of winning: 

  1. Investigate Payouts

All slot machine games are different, some pay out better than others. While there are reasons to go for a lower-paying game, it’s important to know what you’re getting into. A tip for new players is to stick to high payout slots.

  1. Make sure the RTP s acceptable

RTP stands for Return to Player. This is the amount of money you can expect to win back over time in any given game. If a game’s RTP is 97%, you can expect to receive 97% of your bets returned as wins. 

This means that if you bet $100, the average would be to win $97 back. Of course, you may win more than $100, and you may lose more.

  1. Check volatility in Slots

Volatility is the riskiness of a game. It has to do with how big the wins are, and how long you have to wait, on average, to win. If a game has high volatility, that means you may expect long dry periods of no hits before you win. But if you do win, payouts are bigger in high-volatility games.

Higher volatility equals higher risk. And while the payouts are larger, they’re fewer. It’s best to play when you have a lot of time and a lot of cash on your hands.

You have a moderate win-loss ratio with these slots. It’s a good balance between winning or losing spins.

Lower volatility equals lower risk. Payouts are smaller but more frequent.

  1. Pick the right Slot Bonus

You can enjoy your favorite slots with some amazing bonus rounds. For that, we offer you:

  1. Practice for free!

There’s a slot game for every type of player out there. To find yours, try slot games in demo mode at the top online casinos, or grab a bonus and start earning your way toward some big wins today.

  1. Watch Streamers Play

You can learn a lot from watching other people play. Streamers not only spin the reel but explain the dynamics of the slot machine and give away tips on how to make the most of free spins, bonus rounds, and other features.

  1. Learn the Lingo
PaylineAn imaginary line on which symbols need to appear for a winning combination to be formed.
ReelsThe ‘columns’ of online slots, and can be understood as vertical barrels with symbols that you spin to land the winning combinations.
JackpotThe biggest payout that is possible on a certain slot game. You cannot win more than a jackpot.
Free SpinsA set of spins that are played out as a bonus.
Wild Symbols A symbol that replaces all other symbols in the game.
ScatterA symbol that activates a slot’s bonus game if you land a certain number of them. 
AutoPlayAutoPlay allows a player to set a specified number of spins to spin on their own rather than manually.
MultiplierMultipliers are generally attached to a symbol that, when matched, multiplies the player’s winnings by that number. 
Max BetMaximum (or Max) Bet is the largest amount a player can wager on a payline. The concept is “the larger the bet, the bigger the payout.” 
Min BetThe smallest amount a player can wager on a payline.

How Do Slot Games Work?

Online slots work because of random number generators (RNGs). Through the use of RNGs online casinos and software suppliers can ensure that outcomes are as near random as possible.

To make the titles unique, certain aspects of slots are hard-coded into the game. This includes features such as the return to player percentage (RTP) and the game’s volatility (payout frequency).

How Are Slots Made?

Slot providers are the software companies that create the games we play. It’s their responsibility to make sure that their games are using RNG software and adhere to all laws and regulations where their games are played. 

1. NetEnt

NetEnt has one of the largest slot libraries in the world. They’re a Scandinavian company that has been in the industry since 1996. They have plenty of experience in creating games that please a large swath of players.

NetEnt was purchased by Evolution, but all of its titles are still under the NetEnt name. 

2. Big Time Gaming

Big Time Gaming, or BGT, is known for the Megaways slots. These slots give players more ways to win than any other type of online slot.

BTG is new in the US markets, and as such their games are currently only available at Golden Nugget. New players to Golden Nugget get 200 free spins to play on these Megaways slots as part of their welcome bonus.

3. IGT

IGT is also known as International Gaming Technology. They’re one of the top online slot providers in the world. They offer various types of slots with familiar themes including their Cleopatra series, Ghostbusters, Baywatch, and Wheel of Fortune.

You can find and play IGT games at numerous of the top online casinos in the US.  

  1. Microgaming

Microgaming developed the first online gambling software in 1994 and they’re still one of the top game providers in the world.

  1. Red Tiger

Based on the Isle of Man, Red Tiger was created by a team of industry professionals in 2014 after working for some of the top gaming companies in the world. 

Play Mobile Slots

The best slots sites have multiple ways to enjoy their reels on mobile. You can use either the iOS or Android app depending on your mobile device. There’s always a web app that needs no download and works across various platforms, giving instant access to the mobile casino.

In many cases, the mobile casino is our game mode of choice. Why? Well, it’s quite simple – convenience. When you play on mobile, you have access to roughly the same games and casino privileges everyone else enjoys. But you can also choose when and where to play.


Online slots continue to be the most popular online casino game in the US. And as the industry grows, new features and graphics are introduced in them such as Artificial Intelligence (AI) and 3D graphics.

To offer something to each type of player, these games are in constant evolution. Developers have their part too in designing and adding new attributes. This is why we can expect to see new and exciting titles coming to top casinos.

Still not sure what the right online slot game or casino is for you? Read our online casino reviews to find the latest offers and newest games.

Frequently Asked Questions

Online slots use a clever system of random number generators to determine outcomes. These random number generators determine what you ultimately get on the reels. This means there is nothing you can do to influence the result on a slot machine.
You first need to establish if you are in a legal jurisdiction. Our site has information on all slots-legal states and the online casinos you will find there. Create an account and either secure a bonus or deposit funds using your preferred payment method. Once you have got that out of the way, select a game and play.
Starburst is the most popular slot in the U.S... and Europe! Starburst was developed by NetEnt.
There is no strategy that can guarantee to win at slots. You must only keep an eye on how much you are spending and hope for the best.
Sites like the Golden Nugget allow you to play slots for free. Here you will only be playing for fun, but if you utilize non-sticky bonuses, you can play for free and win real money.
Casino Expert
Once upon a time, there was a girl named Stephanie. Curious by nature, she tried several jobs. She was a waitress, a teacher, and even a cook! That last one she didn’t see coming. But she’s a believer that life has many turns and that one must embrace each one. Now a content writer for, we trust Stephanie is all-in in this new chapter.

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