Discover the best online slots like Money Train 4 (RTP 96.1%). Find top slot sites, free spins bonuses, and play 16,800+ free demos.

Discover the best slots and where to play them. Chosen by our experts, after testing 1,000+ games, these slots offer jackpots, high RTP rates, top bonus features, and up to 200,000 x stake per spin. Ready to play? Find a trusted US slot site below.

Read More 5/5 The month’s best online slot:

• Max win: 150,000 x bet
• 20+ bonus features
• High volatility
• RTP: 96.1%

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See over 90 Casino ReviewsSome slots never fall out of favor. Often these titles offer familiarity as they’re based on branded games. Others have become cult classics in their own right, through high payout rates or great features.

Here’s a few of the most popular casino slots this September. Practice and play for fun, then deposit to be in with a chance of winning real money.

Cleopatra Play for freePlay for Real Money Da Vinci Diamonds Play for freePlay for Real Money Buffalo Play for freePlay for Real Money Buffalo King Play for freePlay for Real Money 88 Fortunes Play for freePlay for Real Money Mega Jackpots Wheel of Fortune on Air Play for freePlay for Real Money Jin Ji Bao Xi Endless Treasure Play for freePlay for Real Money Triple Double Da Vinci Diamonds Play for freePlay for Real Money Lucky Larry’s Lobstermania 2 Play for freePlay for Real Money Triple Red Hot 777 Play for freePlay for Real MoneyCheck out our expert’s top 10 online slots for real money. Learn which titles are perfect for you, based on features, software provider, and our Casino.org rating.

View the slots quickly below, then read on for in-depth reviews.

Examine what makes these slots stand out, what players think, and all the need-to-know stats.

Money Train 4 by Relax Gaming

The final installment in the Money Train series, Money Train 4 is a 6x6 grid slot with a scatter pays mechanism. With a high-octane theme and superb graphics, it boasts 20+ bonus features and you can win up to 150,000x your stake on every spin.

💡 Editor’s insight: For me, Money Train 4 was the best release of 2023. Bonus symbols, like the Upgrader, can cause chain reactions across the reels leading to huge wins. The theme is a bit Mad Max too, which suits the high volatility.

💬Provider insight: “Money Train 4 offers the very best in what has been a brilliant series of games, which is reflected in reviews from leading streamers and affiliates. We hope that players love this new Money Train experience.” - Shelley Hannah, CPO at Relax Gaming

⭐ Casino.org rating: 5/5 | 🏅 Best slot for: fearless players hunting big wins

A more recent update of the hugely popular Starburst slot, Starburst XXXtreme features all of the galactic graphics you know and love but with souped-up payouts. Starburst wilds are still present but now come with multipliers. Plus, Starburst XXXtreme offers 200,000 x stake max wins.

💡 Editor’s insight: Though Starburst still draws in players, I much prefer Starburst XXXtreme. Wild multipliers combine to be worth up to 450x, and the max win amount definitely appeals. Higher payouts mean higher volatility, however. Don’t expect as zen an experience as the original.

💬Provider insight: “Everyone knows the Starburst name. It’s been a slot favorite for years. We’ve worked hard to keep classic features and the team has done a great job at incorporating them into an XXXtreme version." - Todd Haushalter, CPO at Evolution

⭐ Casino.org rating: 5/5 | 🏅 Best slot for: players looking for a twist on a classic

One of the most popular Megaways slots available in the US, Bonanza Megaways uses Big Time Gaming’s patented Megaways mechanism to offer you 117,649 ways to win. Played over 6 reels, it comes with 3 bonus features. Cascading wins enhance the base game, while the free spins round comes with added multipliers.

💡 Editor’s insight: I always enjoy Megaways titles but Bonanza Megaways is something of a cult classic. Your biggest winning opportunities come during the free spins round, as multipliers can give you 26,000x stake wins. Although the graphics are a little dated now, in my opinion, the slot still deserves a place on our recommended list.

💬 User review: “Try Bonanza by Big Time Gaming!! Cascades + Megaways = insane potential! - Glimmer_Snuggle_bear, Reddit

⭐ Casino.org rating: 4.9/5 | 🏅 Best slot for: Megaways fans

Released in 2023, Gates of Olympus 1000 takes the original Pragmatic Play slot to a new level. While the design and theme are almost identical to the well-loved Gates of Olympus slot, this new version comes with higher multipliers and the chance to win up to 15,000x your bet per spin. Played on a 6x5 grid with a scatter pays mechanism, tumbles create consecutive wins too.

💡 Editor’s insight:Pragmatic Play has released a series of ‘1000’ slots recently, but Gates of Olympus 1000 is by far my favorite. The graphics still look sharp and the payouts are three times higher than before. This is thanks to a rewarding 1000x multiplier which can land randomly during the base game or free spins.

💬 Provider insight: “Zeus is back with a bang in this striking sequel to our iconic ancient Greek-themed release. Gates of Olympus 1000 takes one of Pragmatic Play’s most popular and successful slots ever and massively boosts its win potential." - Irina Cornides, COO at Pragmatic Play

⭐ Casino.org rating: 4.6/5 | 🏅 Best slot for: scatter pays with a classic theme

With 6 reels and 4,096 ways to win, Buffalo Blitz II is one of the best slot sequels around. It’s highly volatile, and comes with 5x multiplier wilds in the base game. Land scatter symbols to trigger the free spins round, and win up to 100 free games. During the bonus round, the unique Ways Boost engine allows you to play with 14,400 ways to win.

💡 Editor’s insight:Although I always loved the original, I much prefer playing Buffalo Blitz II. Multipliers can land during the base game, which is quite rare. As this is a high variance slot, however, I recommend playing when you have a bigger bankroll that can see you through any dry spells.

💬 User review: “Deposited $5, and was playing Buffalo Blitz II. Did good so upped my bet. I got it up to $1K, and when I got down to $900, I cashed in!" - wessdude79, Reddit

⭐ Casino.org rating: 4.9/5 | 🏅 Best slot for: high volatilty fans

Are you a slot fanatic? Have you played all of our recommended games already? Try the latest releases for free instead.

Kitty Kollect Play for freePlay for Real Money Big Game Fishing Play for freePlay for Real Money Book of Xerxes Play for freePlay for Real Money Highway Rebels Play for freePlay for Real MoneyOnly the best online slots make it to this page. To decide which are worth spinning, we look at the following factors:

Return to player rates

Before anything else, we check the slot’s return to player (RTP) rate. Slots have an average RTP of 96%, so anything below this won’t make the cut. Marching Legions by Relax Gaming and 1429 Uncharted Seas by Thunderkick win this round, with industry-leading RTPs of over 98%.

💡 Expert insight:The return to player rate represents the percentage a slot will pay back to players over time. While this is a theoretical rate, calculated over millions of spins, it’s still important. Simply put, the higher the RTP, the better your chances of winning in the long run.

Maximum win figures

All slots have a maximum win amount, per spin. This is expressed as a multiplier (e.g. 5,000x) though it’s not just the payline wins that contribute. Max win amounts are usually only achieved via bonus features working together. For example, Money Train 4 offers max wins of 150,000x your stake. These come via the Money Cart Bonus feature where 20 special symbols can upgrade wins.

💡 Expert insight:In the past few years we’ve seen maximum win amounts drop significantly. Nowadays 10,000x your stake is considered a decent stat. That said, providers such as Relax Gaming and NetEnt still produce slots with huge winning potential.

Bonus features

It’s easy to think the more bonus features, the better. However, they must work well together and be easy to understand too. Money Train 4 boasts 20+ features but, as these are mainly confined to one bonus round, it’s not too overwhelming. In contrast, slots like Starburst XXXtreme are great due to their simplicity.

We rate a slot’s bonus features on the overall value they add to the game, not just the quantity.

Graphics and theme

Unique themes and design choices make the best slots stand out. For example, 4 Fantastic Fish in Egypt spins the classic Egyptian theme on its head. It features animated symbols and you can play in ‘Big Reel Portrait Mode’ for an immersive mobile slot experience.

💡 Expert insight:In 2024, we don’t want to see a slot’s graphics described as ‘smooth’ or ‘crisp’ - that’s the bare minimum you should expect! Instead, look for exciting cut-scenes that are more akin to Xbox games than one-armed bandits.

Original mechanisms

Innovative online slots will feature interesting layouts and payout mechanisms. For example, slots with the Megaways mechanism by Big Time Gaming are incredibly popular. These can offer up to 586,971 ways to win. Other examples include the Infinity Reels mechanism by Relax Gaming and scatter pays slots. Overall, if a slot offers something fresh, it gets points from us.

Licenses and fairness

Last but by no means least, we never put your bankroll at risk. Any slot featured on Casino.org will be properly licensed and tested for fairness. For instance, NetEnt Americas is licensed by the New Jersey Division of Gaming Enforcement, the Pennsylvania Gambling Commission Board (PGCB), and the West Virginia Lottery (WVL).

💡 Expert insight:The best slot software providers are part of eCORGA. eCOGRA is an independent testing body that ensures game results are random and RTP rates are correct. Software providers don’t need to be eCOGRA certified to gain licenses, so it’s a huge mark of trust.

4.8/5Before anything else, we check the slot’s return to player (RTP) rate. Slots have an average RTP of 96%, so anything below this won’t make the cut. Marching Legions by Relax Gaming and 1429 Uncharted Seas by Thunderkick win this round, with industry-leading RTPs of over 98%.

💡 Expert insight:The return to player rate represents the percentage a slot will pay back to players over time. While this is a theoretical rate, calculated over millions of spins, it’s still important. Simply put, the higher the RTP, the better your chances of winning in the long run.

All slots have a maximum win amount, per spin. This is expressed as a multiplier (e.g. 5,000x) though it’s not just the payline wins that contribute. Max win amounts are usually only achieved via bonus features working together. For example, Money Train 4 offers max wins of 150,000x your stake. These come via the Money Cart Bonus feature where 20 special symbols can upgrade wins.

💡 Expert insight:In the past few years we’ve seen maximum win amounts drop significantly. Nowadays 10,000x your stake is considered a decent stat. That said, providers such as Relax Gaming and NetEnt still produce slots with huge winning potential.

It’s easy to think the more bonus features, the better. However, they must work well together and be easy to understand too. Money Train 4 boasts 20+ features but, as these are mainly confined to one bonus round, it’s not too overwhelming. In contrast, slots like Starburst XXXtreme are great due to their simplicity.

We rate a slot’s bonus features on the overall value they add to the game, not just the quantity.

Unique themes and design choices make the best slots stand out. For example, 4 Fantastic Fish in Egypt spins the classic Egyptian theme on its head. It features animated symbols and you can play in ‘Big Reel Portrait Mode’ for an immersive mobile slot experience.

💡 Expert insight:In 2024, we don’t want to see a slot’s graphics described as ‘smooth’ or ‘crisp’ - that’s the bare minimum you should expect! Instead, look for exciting cut-scenes that are more akin to Xbox games than one-armed bandits.

Innovative online slots will feature interesting layouts and payout mechanisms. For example, slots with the Megaways mechanism by Big Time Gaming are incredibly popular. These can offer up to 586,971 ways to win. Other examples include the Infinity Reels mechanism by Relax Gaming and scatter pays slots. Overall, if a slot offers something fresh, it gets points from us.

Last but by no means least, we never put your bankroll at risk. Any slot featured on Casino.org will be properly licensed and tested for fairness. For instance, NetEnt Americas is licensed by the New Jersey Division of Gaming Enforcement, the Pennsylvania Gambling Commission Board (PGCB), and the West Virginia Lottery (WVL).

💡 Expert insight:The best slot software providers are part of eCORGA. eCOGRA is an independent testing body that ensures game results are random and RTP rates are correct. Software providers don’t need to be eCOGRA certified to gain licenses, so it’s a huge mark of trust.

4.8/5Check out the most hotly anticipated slots of 2024 and their release dates.

• 4 Fantastic Fish Gold Dream Drop by 4ThePlayer - 🔥 Out now
• SixSixSix by Hacksaw Gaming - 🔥 Out now
• Sumo Supreme Megaways by Pragmatic Play - 🔥 Out now
• Atlantis Crush by Relax Gaming - 🔥 Out now
• Space Wars Megaways XXXtreme by NetEnt - August 13
• Ankh of Anubis Awakening by Play’n GO - August 22
• The Dog House – Mutley Crew by Pragmatic Play - October 3
• Danger High Voltage 2 by Big Time Gaming - October 23
• Esqueleto Explosivo 3 by Thunderkick - October 23
• Rich Wilde and the Pearls of Vishnu by Play’n GO - November 14

If you’re a slot fan looking for the hottest releases, check out our dedicated new slots page. Here you can play the latest game demos for free, plus the best casinos for playing new slots in the US.

Play the best new slots in the US nowExplore our expert’s top five US slot sites. Choose a site based on the number of slots it offers, software providers, RTP rate, or Casino.org rating.

Check out the casinos at a glance below or read on for an in-depth review.

Take a closer look at our top slot sites for US players. Discover why they’re so great for playing slots, their drawbacks, and what existing players think.

Caesars Palace Online Casino is one of my favorite places to play slots. It boasts 700+ slots from 21 providers. In comparison, the average US slot site offers games from around 15 providers. Try out heavy-hitting slots from Relax Gaming, or opt for classics from Barcrest, the choice is yours.

💬 User review:“The bonuses and promos at Caesars Casino Online are pretty good. They totally met my expectations and added to the fun.” - Feeling_Yak7183 - Reddit user, January, 2024

🎰 Top slots: Guns ’n’ Roses (NetEnt), Money Train 4 (Relax Gaming), Rainbow Riches (Barcrest)

Learn more about the Caesars Palace promo code or read our full Caesars Palace Online Casino review.

✅ Unique rewards program | Highest win rate (97.63%) of our top picks | Largest welcome bonus on our shortlist

❌ 70% of our top casinos payout quicker

BetRivers comes complete with 1,400+ slots from great providers such as Hacksaw Gaming and IGT. This slot site also boasts over 100 jackpot slots, including NetEnt’s Mega Fortune and Divine Fortune. With so many slots, I found it impressive that the casino’s overall win rate is above average at 96.96%. That said, this is slightly lower than Caesars Place.

💬 User review:“BetRivers is a solid choice for newbies and pros alike. The promos and game options are definitely awesome.” - karmaahmad - Reddit user, January 2024

🎰 Top slots: Wanted Dead or a Wild (Hacksaw Gaming), Colt Lightning Firestorm (Play’n GO), Nitropolis (ELK Studios)

Learn more about the BetRivers promo code or read our full BetRivers casino review.

✅ Highest number of slots on our list | Above average number of progressive slots | Accessible 1x wagering on bonuses

❌ Does not offer a no-deposit bonus

Most US casinos have around 800 slot games, but Golden Nugget exceeds this with over 1,000. With 25+ software providers, I enjoyed seeing names like IGT and NetEnt alongside smaller brands such as AGS. Homegrown exclusive games also allow Golden Nugget to stand out from the crowd.

💬 User review:“I’ve been happy with Golden Nugget for a long while, their daily and weekend bonuses were great.” - Tim Rownan - Reddit user, February 2024

🎰 Top slots: 9k Yeti (4ThePlayer), Lobstermania 2 (IGT), Bonanza Megaways (BTG)

Read our full Golden Nugget casino review.

✅ Wider range of software providers (25+) than most US casinos | 15+ bespoke slots | Larger than average referral bonus of $500

❌ Slowest average payout speed of our top casinos

While BetMGM offers fewer software providers than other slot sites on this list, there are still over 800+ high-quality slots to play. Providers such as NetEnt, Relax Gaming, and Play’n GO feature on the casino’s roster, plus you can enjoy slots exclusive to the BetMGM / Bwin.Party network. With a complete MegaJackpots suite from IGT to boot, it’s my favorite slot site for jackpot slots.

💬 User review:“It’s my favorite place to gamble. Love the variety of slots. Fast payouts. I’ve been using them for 2 yrs now and never had a problem.” - Tiffany Brad - Google Play Store review

🎰 Top slots: MGM Grand Millions (created in house), Cleopatra MegaJackpots (IGT), Hellcatraz (Relax Gaming)

Learn more about the BetMGM promo code or read our full BetMGM casino review.

✅ Generous $25 no deposit bonus | 40+ exclusive slots | Lower than average wagering requirements (1-15x)

❌ Lowest overall payout rate of our top sites

Although DraftKings Casino offers the lowest number of slots on this list (500+), the good news is that you can play over 40 DraftKings exclusives. This includes titles such as NBA Slam Dunk Roulette, Playboy Diamonds, and Loki’s Luck. The casino’s slot collection is also well-curated, covering all themes and slot types. For instance, a quick search of Buffalo-themed slots found over 18 titles, including Buffalo Blitz II. You can also enjoy 60+ Megaways slots.

🎰 Top slots: Ted Jackpot Royale (Blueprint),Buffalo Blitz II (Playtech), Gonzo’s Quest Megaways (Red Tiger)

Learn more about the DraftKings promo code or read our full DraftKings casino review.

✅ 2nd highest win rate on our shortlist | 60+ Megaways slots | 40+ exclusive DraftKings slots

❌ Smallest welcome bonus on our list

If you want to play real money slots at online casinos in the US, just follow these simple steps. Spinning the reels couldn’t be easier!

Locate your perfect slots casino by answering a couple of questions. We’ll provide you with the best option based on your answers. Select one of the following options Classic 3D Slots Video Slots Vegas Slots Jackpot Slots At any top US online casino there are plenty of slot games to choose from. Real money slots range from classic three-reel games, to colorful and feature-packed video slots. Take a look at the most popular online slot varieties below.

Three reel slots

As the name suggests, three reel slots are played over just three reels. In general, they don’t have many paylines and often feature old-school symbols such as 7s and bars. To win, simply line up three matching symbols on a single payline. In addition, Most three-reel slots don’t include bonus rounds and may not even feature many special symbols.

💡 Expert insight: Many older slots are three-reelers but there are great new titles too. Toro 7’s by ELK Studios, for example, mixes this traditional layout with new features.

🎰 Best three-reel slots: Toro 7’s by Elk Studios, Break Bones by Hacksaw Gaming, Mega Joker by NetEnt

Toro 7s Play for freePlay for Real Money

Five reel slots

Most video slots have five reels or more. This simply refers to the number of columns in the game, and these spin independently of each other. Paylines here can range from 10 to well over 100. Winning combinations are generally formed by landing 3 or more matching symbols across consecutive reels. Expect a wide range of features such as wilds, scatters, and bonus games.

💡 Expert insight:With these types of slots, your bet is usually set per line, although you have to play all paylines. Play a 5 reel, 10 fixed payline slot, and you can bet $0.10 per payline. This means each spin costs $1 in total.

🎰 Best five-reel slots: Starburst by NetEnt, Book of Dead by Play’n GO, Big Bass Bonanza by Pragmatic Play

Starburst Play for freePlay for Real Money

Megaways slots

Megaways is a game engine/mechanic created by Big Time Gaming (BTG). Megaways slots are played with up to 6 reels where the number of symbols on each reel changes with each spin.

The number of symbols on each reel creates the number of available ways to win. For example, in a 117,649 Megaways slot, each reel can contain between 2 and 7 symbols. If each reel displays 3 symbols each, the number of Megaways will be 729 (3^6=729). Seeing 7 symbols on each reel, however, gives you the maximum 117,649 Megaways (7^6=117,649).

💡 Expert insight:Although the Megaways mechanism was first developed by BTG, they have licensed it out to many other providers. This means you can play Megaways versions of many popular slots.

🎰 Best Megaways slots: Bonanza Megaways by BTG, Blood Suckers Megaways by Red Tiger, Buffalo Blitz Megaways by Playtech

Blood Suckers Megaways Play for freePlay for Real Money

Grid slots/Cluster pays

Grid slots, also known as cluster pays slots, are played on grids instead of reels. They do not feature paylines and instead, to form a win, you must land matching symbols in a cluster formation. Symbols must be next to each other, touching either horizontally, vertically, or diagonally. The bigger the cluster, the bigger the win.

Grid slots almost always feature cascades/tumbles. Winning clusters are removed from the reels, allowing them to be replaced by new symbols. This can lead to consecutive wins if you land further winning clusters.

💡 Expert insight:Grid slots have soared in popularity and now come in all shapes and sizes. Slots like Dam Beavers by ELK Studios take this to the extreme, offering expanding grids and different playing levels.

🎰 Best grid slots:Dam Beavers by ELK Studios, Lure of Fortune by Relax Gaming, Cluster Tumble by Relax Gaming

Dam Beavers Play for freePlay for Real Money

Scatter pays slots

Scatter pays slots feature a specific mechanic where winning combinations can be formed by symbols appearing in any position on the reels, instead of along paylines. You could have 1 symbol on each reel for example.

💡 Expert insight:Whilst scatter pays slots are usually played across a grid, they aren’t to be confused with grid slots. The difference is the way symbols pay out - in random positions vs in clusters. That said, in most cluster pays slots, winning symbols are also removed from the board by a cascade/tumble feature.

🎰 Best grid slots: Money Train 4 by Relax Gaming, Gates of Olympus 1000 by Pragmatic Play, Sweet Bonanza by Pragmatic Play

Gates of Olympus 1000 Play for freePlay for Real Money

Progressive jackpot slots

Progressive jackpot slots are individual slots, or series of slots, that share a jackpot prize pool across a network of casino sites. Each time a player bets on the slot, a portion of that bet goes towards the jackpot. As players across the world are adding to the jackpot constantly, progressive jackpot figures can grow quickly. Progressive jackpots seed at different amounts. For instance, the Mega Fortune Mega Jackpot seeds at $150,000. This is the minimum you can win.

💡 Expert insight:The world’s most famous progressive jackpot slot is Mega Moolah by Microgaming. Unfortunately, this slot is not available in the US.

🎰 Best grid slots: Mega Fortune by NetEnt, Age of the Gods by Playtech, Space Miners Dream Drop by Relax Gaming.

Age of the Gods Play for freePlay for Real Money

Branded slots

Branded online slots are games inspired by movies, board games, television shows, or even cartoons. Branded slots don’t feature any specific mechanisms or layouts, so expect them to come in all shapes and sizes. Providers like NetEnt and Playtech are well-known for producing a lot of branded titles.

💡 Expert insight:Branded slots often have lower RTP rates than regular titles. This is because the slot provider must pay a licensing fee to the movie/TV studio. What’s more, a studio may pull a branded slot at any time. The Marvel slots by Playtech, for example, were once huge. However, when Disney bought the Marvel brand, they ceased to exist.

🎰 Best grid slots: Jurassic Park by Microgaming, Narcos Mexico by Red Tiger, Breaking Bad: Cash Collect & Link by Playtech

Jurassic Park As the name suggests, three reel slots are played over just three reels. In general, they don’t have many paylines and often feature old-school symbols such as 7s and bars. To win, simply line up three matching symbols on a single payline. In addition, Most three-reel slots don’t include bonus rounds and may not even feature many special symbols.

💡 Expert insight: Many older slots are three-reelers but there are great new titles too. Toro 7’s by ELK Studios, for example, mixes this traditional layout with new features.

🎰 Best three-reel slots: Toro 7’s by Elk Studios, Break Bones by Hacksaw Gaming, Mega Joker by NetEnt

Most video slots have five reels or more. This simply refers to the number of columns in the game, and these spin independently of each other. Paylines here can range from 10 to well over 100. Winning combinations are generally formed by landing 3 or more matching symbols across consecutive reels. Expect a wide range of features such as wilds, scatters, and bonus games.

💡 Expert insight:With these types of slots, your bet is usually set per line, although you have to play all paylines. Play a 5 reel, 10 fixed payline slot, and you can bet $0.10 per payline. This means each spin costs $1 in total.

🎰 Best five-reel slots: Starburst by NetEnt, Book of Dead by Play’n GO, Big Bass Bonanza by Pragmatic Play

Megaways is a game engine/mechanic created by Big Time Gaming (BTG). Megaways slots are played with up to 6 reels where the number of symbols on each reel changes with each spin.

The number of symbols on each reel creates the number of available ways to win. For example, in a 117,649 Megaways slot, each reel can contain between 2 and 7 symbols. If each reel displays 3 symbols each, the number of Megaways will be 729 (3^6=729). Seeing 7 symbols on each reel, however, gives you the maximum 117,649 Megaways (7^6=117,649).

💡 Expert insight:Although the Megaways mechanism was first developed by BTG, they have licensed it out to many other providers. This means you can play Megaways versions of many popular slots.

🎰 Best Megaways slots: Bonanza Megaways by BTG, Blood Suckers Megaways by Red Tiger, Buffalo Blitz Megaways by Playtech

Grid slots, also known as cluster pays slots, are played on grids instead of reels. They do not feature paylines and instead, to form a win, you must land matching symbols in a cluster formation. Symbols must be next to each other, touching either horizontally, vertically, or diagonally. The bigger the cluster, the bigger the win.

Grid slots almost always feature cascades/tumbles. Winning clusters are removed from the reels, allowing them to be replaced by new symbols. This can lead to consecutive wins if you land further winning clusters.

💡 Expert insight:Grid slots have soared in popularity and now come in all shapes and sizes. Slots like Dam Beavers by ELK Studios take this to the extreme, offering expanding grids and different playing levels.

🎰 Best grid slots:Dam Beavers by ELK Studios, Lure of Fortune by Relax Gaming, Cluster Tumble by Relax Gaming

Scatter pays slots feature a specific mechanic where winning combinations can be formed by symbols appearing in any position on the reels, instead of along paylines. You could have 1 symbol on each reel for example.

💡 Expert insight:Whilst scatter pays slots are usually played across a grid, they aren’t to be confused with grid slots. The difference is the way symbols pay out - in random positions vs in clusters. That said, in most cluster pays slots, winning symbols are also removed from the board by a cascade/tumble feature.

🎰 Best grid slots: Money Train 4 by Relax Gaming, Gates of Olympus 1000 by Pragmatic Play, Sweet Bonanza by Pragmatic Play

Progressive jackpot slots are individual slots, or series of slots, that share a jackpot prize pool across a network of casino sites. Each time a player bets on the slot, a portion of that bet goes towards the jackpot. As players across the world are adding to the jackpot constantly, progressive jackpot figures can grow quickly. Progressive jackpots seed at different amounts. For instance, the Mega Fortune Mega Jackpot seeds at $150,000. This is the minimum you can win.

💡 Expert insight:The world’s most famous progressive jackpot slot is Mega Moolah by Microgaming. Unfortunately, this slot is not available in the US.

🎰 Best grid slots: Mega Fortune by NetEnt, Age of the Gods by Playtech, Space Miners Dream Drop by Relax Gaming.

Branded online slots are games inspired by movies, board games, television shows, or even cartoons. Branded slots don’t feature any specific mechanisms or layouts, so expect them to come in all shapes and sizes. Providers like NetEnt and Playtech are well-known for producing a lot of branded titles.

💡 Expert insight:Branded slots often have lower RTP rates than regular titles. This is because the slot provider must pay a licensing fee to the movie/TV studio. What’s more, a studio may pull a branded slot at any time. The Marvel slots by Playtech, for example, were once huge. However, when Disney bought the Marvel brand, they ceased to exist.

🎰 Best grid slots: Jurassic Park by Microgaming, Narcos Mexico by Red Tiger, Breaking Bad: Cash Collect & Link by Playtech

Master the most common special symbols and bonus features you will find in online slots.

🔥 Special symbols in online slots

• Wild symbols: These can be found in most slot games and substitute for any paytable symbol to create a winning combination. Wilds can also carry cash values which are paid when you form a combination of wilds along a payline.
• Scatter symbols: Match three or more scatters anywhere on the reels to unlock a special feature. This could be a free spins round or a bonus game.
• Multipliers: Multipliers, as their name suggests, times your total win by a specific value. Multipliers may be found in the base game or a bonus round.
• Expanding wilds: Expanding wilds are similar to regular wilds, though they can expand to cover a whole reel. This gives you plenty more opportunities to create winning combinations.
• Sticky wilds: These wilds remain in place until you get a winning combination, or throughout a bonus feature.
• Modifier symbols: These symbols may change the size of a reel, the number of reels in the game, the payouts of a certain symbol, or replace low-paying symbols with higher ones. Ultimately, modifiers can do just about anything.

💰 Online slot bonus rounds

• Free spins feature: You’ll get a number of free spins, allowing you to play without placing extra wagers. Free spins are often played out on a different game screen and may come with multipliers.
• Respins feature: This gives you a second chance at creating a winning combination, or allows you to create consecutive wins. Winning symbols may be held and respins may continue until no new wins are formed.
• Pick me feature: This is a simple bonus round where you reveal objects to collect cash prizes.
• Trail feature: Roll a die or spin again to work your way around a trail. Along the way, pick up extra prizes depending on where you land. Generally, the further along the trail you get, the bigger the prizes.
• Gamble feature: Choose to gamble your wins to play on in free spins or to multiply wins. Common gamble features include picking a card, higher or lower, gamble wheels, or coin flips.
• Bonus buy: In some slots, you can simply buy your way into a bonus round for a fixed price. This allows you to bypass the base game. though it can be expensive.

💡 Expert insight: This list is by no means exhaustive. Slots providers are constantly coming up with new bonuses and features to beat the competition. Always read the paytable carefully before playing to understand what’s available and how it works.

Fed up with reading? Want to try out some slot types and bonus features for yourself? Play free slot demos right here at Casino.org. Our slots library boasts over 16,800 titles, from a range of the best software providers in the US. We constantly update it too, so expect both new releases and cult classics.

Play free slots nowAs we mentioned earlier, RTP rates represent the amount you would win back from your bets over a long period. For example, a slot with a 96% RTP rate will pay you back 96% of your stakes, in time. Wager $100 and you’ll get $96 back on average.

Naturally, short-term results are variable and RTP rates are theoretical. However, in general, the higher the RTP rate, the better paying the slot.

Check out the highest RTP slots in the US below. For context, the average payout on a slots game is 96%.

Online slot games are provided by software developers, and each online casino will offer a range of developers to choose from. Below are some of the most popular brands that create top real money slots for the US.

NetEnt slots

NetEnt has been creating games for more than 25 years with online slots like Starburst and Dead or Alive 2 in its portfolio. It was also the first brand to release a grid slot, with Aloha! Cluster Pays in 2018. In 2020, NetEnt merged with Evolution alongside other studios like Red Tiger. Check out our NetEnt casinos guide to learn more.

📍 Established: 1996

🎰 Number of slots: 200+

🌟 Popular slots: Starburst, Gonzo’s Quest, Dead or Alive II, Mega Fortune

Best NetEnt slot site: Caesars PalaceRelax Gaming slots

Bursting onto the US slot scene in 2023, Relax Gaming is one of the most exciting brands right now. With high payout slots like Money Train 4 and the Dream Drop jackpot series, it’s easy to see why their games attract so much attention. Relax Gaming also expertly adopts mechanisms from other providers, check out Temple Tumble Megaways for proof.

📍 Established: 2010

🎰 Number of slots: 100+

🌟 Popular slots: Money Train 4, Hellcatraz, Marching Legions, Dead Man’s Trail Dream Drop

Best Relax slot site: Caesars PalacePlaytech slots

The world’s largest provider of casino games, Playtech slots are available in over 180 countries. With over 20 years of experience, famous slots include the Age of the Gods jackpot series. This provider also produces excellent branded titles such as The Walking Dead 2 and Rocky.

📍 Established: 1999

🎰 Number of slots: 700+

🌟 Popular slots: Buffalo Blitz II, Age of the Gods, Breaking Bad: Cash Collect & Link

Best Playtech slot site: BetRiversMicrogaming slots

Microgaming creates a range of real money slots that players love. With 20+ years in the industry, titles such as Thunderstruck II and Game of Thrones stand out. In 2022, Microgaming joined the Games Global brand along with over 40 other independent studios. Read our guide to learn more about Microgaming casinos.

📍 Established: 1994

🎰 Number of slots: 800+

🌟 Popular slots: Jurassic Park, Immortal Romance, Pharaoh’s Fortune, Mega Moolah

Best Microgaming slot site: BetMGMBig Time Gaming slots

There aren’t a lot of slot providers who have had as big an impact on the industry as Big Time Gaming. Always at the forefront of innovation, the brand is famous for its Megaways titles. Other popular BTG mechanisms include Megaclusters and Megaquads.

📍 Established: 2011

🎰 Number of slots: 50+

🌟 Popular slots: Bonanza Megaways, Danger High Voltage, White Rabbit Megaways, Monopoly Megaways

Best BTG slot site: Caesars PalacePlay’n GO slots

Another industry-changing brand, Play’n GO was the first provider to release mobile slots. The brand is best known for Book of Dead, however, a slot that spawned thousands of imitations. With thousands of characters and over 300 slots, creativity is what they do best.

📍 Established: 2011

🎰 Number of slots: 50+

🌟 Popular slots:Book of Dead, Reactoonz, Colt Lightning, Legacy of Dead

Best Play’n GO slot site: BetRiversMost online slot sites in the US will offer you a welcome bonus or a sign-up bonus when you register for the first time. Usually, this bonus is a percentage of your first deposit, but it may be a free spins bonus too.

This isn’t the only reward you can expect as a US slots player, however. Check out these common slots promotions and offers:

• Regular free spins: Just like free spins bonuses on sign-up, regular free spins give you a certain number of free games to spend on a specific slot or range of slots. Slot sites use these bonuses to celebrate new slot launches or new providers. Free spins usually come with wagering requirements but, at the best US casinos, these are no more than 1x.
• Slots tournaments: As their name suggests, slots tournaments pit you against against other players. Play selected slots during the tournament period, and win points for winning spins, bonus round triggers, and more. Climb the leaderboard to secure a prize.

Best online slots casino bonuses for September

Now you know everything about online slots in the US, it’s time to get started. Before you do, consider these top tips from our Content Editor, Daisy.

Choose slots by RTP and volatility

Before I play a slot, I always check the return to player rate. If it’s below 96%, I’m likely to give it a miss. The higher the RTP rate, the better the long-term payouts. However, it’s also useful to factor in volatility. If I want to play for longer, I’ll choose low-volatility games that pay out frequently. If I’ve got the bankroll to survive a dry spell, I’ll choose high volatility slots that pay out large amounts once in a while.

Choose slots you enjoy

Despite the fact I always check the stats, it’s equally important to play games you actually enjoy. With thousands of slots out there, there are themes and features for everyone. Personally, I enjoy unique themes with new mechanisms - the more absurd the better. Many players enjoy simple slots, however, so figure out what works for you.

Practice with free demos

If you are opting for slots with new bonus features, always play free demos first. They allow you to understand exactly what’s going on, and how the slot pays out, without risking your bankroll. Once you’re comfortable, you can give them a spin at a real money slot site.

Use bonuses and promotions to try new games

Many top slot sites offer free spins to new players. They may also run promotions when new slots launch. This is the perfect opportunity to step outside your comfort zone and try something different. Remember to read the T&Cs, however, as some slots are excluded. For example, wagers on Blood Suckers by NetEnt often won’t contribute towards wagering requirements as the slot has such a high RTP rate.

Play at trusted US slot sites

I only ever play at slot sites with positive user and industry reviews. Naturally, it’s easier for me to find these sites (as I do the reviewing!) but you can use our list instead. All of our recommended slot sites are guaranteed to provide a great slots experience.

Before I play a slot, I always check the return to player rate. If it’s below 96%, I’m likely to give it a miss. The higher the RTP rate, the better the long-term payouts. However, it’s also useful to factor in volatility. If I want to play for longer, I’ll choose low-volatility games that pay out frequently. If I’ve got the bankroll to survive a dry spell, I’ll choose high volatility slots that pay out large amounts once in a while.

Despite the fact I always check the stats, it’s equally important to play games you actually enjoy. With thousands of slots out there, there are themes and features for everyone. Personally, I enjoy unique themes with new mechanisms - the more absurd the better. Many players enjoy simple slots, however, so figure out what works for you.

If you are opting for slots with new bonus features, always play free demos first. They allow you to understand exactly what’s going on, and how the slot pays out, without risking your bankroll. Once you’re comfortable, you can give them a spin at a real money slot site.

Many top slot sites offer free spins to new players. They may also run promotions when new slots launch. This is the perfect opportunity to step outside your comfort zone and try something different. Remember to read the T&Cs, however, as some slots are excluded. For example, wagers on Blood Suckers by NetEnt often won’t contribute towards wagering requirements as the slot has such a high RTP rate.

I only ever play at slot sites with positive user and industry reviews. Naturally, it’s easier for me to find these sites (as I do the reviewing!) but you can use our list instead. All of our recommended slot sites are guaranteed to provide a great slots experience.

More slots strategy guides

How do online slots work?

The basic concept of spinning the reels to match symbols and win is the same with online slots and physical slot machines. The key difference with playing slots online is that the variation of games will be wider, and you’ll find that most online slots offer more reels and paylines. This increases your chances of netting a winning combination.

Can I play slots for free?

Yes. You can play free slot games right here at Casino.org. We have over 16,800+ free slots for you to enjoy. Play for fun or use them to practice before wagering with real money.

What should I look for in an online slot casino?

After checking the site’s security and legitimacy, you want to look for casinos that offer the widest range of entertaining slots. Check available software providers, themes, and jackpot games. Check the return to player (RTP) percentages too, and look out for new player bonuses. To find out our top US slot site for this month head to our top recommended casinos.

Are online slots rigged?

No, all regulated online slot machines are completely fair. The results are random every time, meaning that nothing in the game is rigged. To ensure fair play, only choose slot games from approved online casinos, such as those we list above. Playing at any of these will give you a fair chance of winning.

Can you legally play slots online for real money in the US?

You can enjoy real money slots online in Pennsylvania, Michigan, New Jersey, West Virginia, Connecticut, and Delaware. The legal gambling age in most US states is 21 but there are some exceptions. Make sure you find out whether online gambling is legal in your state and also what the legal gambling age is before you play.

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