The World’s Best Online Slot Games (2022)

Row of slot machines at a casino.

Slots are by far the most popular games in the world of online casinos. With the potential to win far bigger prizes than each bet, combined with the eye-catching themes and features, it makes sense that they demand so much attention. It’s why many of our promotions offer free spins for the best slots out there!

However, navigating the ocean of slot games can be very tricky as there are so many already, with new slots added weekly at Casino.com. To help you, we’re playing by the rule of thumb in slots, which is to follow the crowd. Once slot spinners find a game that they enjoy, they tend to stick to it for a long time.

So, to hopefully help you find the best games for you, here are the most popular slot games online. You’ll find a great range of slots below, from low volatility games to massive progressive jackpot suites. 

Reel King Mega

Reel King Mega online slot game.
  • Provider: Red Tiger Gaming
  • Volatility: Low
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 91% to 96%
  • Progressive Jackpot: Yes
  • Similar Slots: Gold King, Fire Joker

Showcasing that it’s not all about the newest themes and features, Reel King Mega is very much made for those who like classic slots, otherwise known as ‘fruit machines’ or ‘one-armed bandits.’ On the reels of this 20-payline slot, you’ll be looking to land high-card symbols, wilds, and those with a yellow background to trigger the Reel King feature of Lucky 7s.  

Hammer of Vulcan

Hammer of Vulcan online slot game.
  • Provider: Quickspin
  • Volatility: High
  • Reels and Rows: Six Blocks by Four Blocks
  • RTP: 95.8%
  • Progressive Jackpot: No
  • Similar Slots: Crown of Valor

Come to the colossal anvil to see what the Hammer of Vulcan can craft for you in this Roman mythology-themed slot game. Played on a cascading grid of six by four blocks, the slot boasts 4,096 paylines, a wild feature, free spins, multipliers that you build up, and a jackpot of 20,000x your bet.

9 Pots of Gold

9 Pots of Gold online slot game.
  • Provider: Gameburger Studios (Microgaming)
  • Volatility: Medium
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 96.3%
  • Progressive Jackpot: No
  • Similar Slots: 9 Masks of Fire, Rainbow Riches

Combining the classic slot layout with the forever synonymous theme of the lucky leprechaun, 9 Pots of Gold is loaded with features. Played on 20 paylines, it has a Pot of Gold scatter that leads to the 2,000x jackpot, wilds, and free spins. If you’ve played 9 Masks of Fire and love the lucky Irish iconography, 9 Pots of Gold is worth a spin.

Rich Wilde and the Book of Dead

Rich Wilde Book of Dead slot game.
  • Provider: Play’n Go
  • Volatility: High
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 94.3%
  • Progressive Jackpot: No
  • Similar Slots: Cat Wilde and the Doom of Dead, Rich Wilde and the Aztec Idols, Rich Wilde and the Tome of Madness

If you were to point to a handful of games that could compete for the title of the outright most popular slot games of all time, Riche Wilde and the Book of Dead would certainly be in the mix. The high volatility slot played along ten paylines has become legendary, with big wins hinging on unlocking the free spins hidden within the titular Book of Dead symbols.

Gonzo’s Quest Megaways

Gonzo's Quest Megaways slot.
  • Provider: Red Tiger Gaming
  • Volatility: Medium-High
  • Reels and Rows: Six Reels, Varied Rows
  • RTP: 94.7%
  • Progressive Jackpot: No
  • Similar Slots: Gonzo’s Quest, Gonzo’s Gold, Bonanza

The original Gonzo’s Quest game helped to establish NetEnt as a top-class provider, but Gonzo’s Quest Megaways from Red Tiger Gaming – which was acquired by NetEnt in 2019 – has enhanced the experience further. Now, the little conquistador faces the cascading block wall with added Megaways features, which can yield up to 117,649 paylines on any given spin.

Starburst

Starburst slot game.
  • Provider: NetEnt
  • Volatility: Low
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 96.1%
  • Progressive Jackpot: No
  • Similar Slots: Starburst XXXtreme, Queen of Alexandria

Just as Book of Dead became the star of the show for high volatility seekers, Starburst became a mainstay in the Top Games section as a low volatility sensation. A wonderfully simple slot in a space theme, it has ten paylines and one feature: Starburst Wilds. When a wild lands, it expands to cover the reel and triggers a respin. Other slot games may have more special features, but not many can beat this all-time classic title.

Sherlock & Moriarty WowPot!

Sherlock and Moriarty WowPot online slot game.
  • Provider: JustForTheWin (Microgaming)
  • Volatility: Medium
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 92.1%
  • Progressive Jackpot: Yes
  • Similar Slots: Sisters of Oz WowPot!, Ancient Fortunes: Poseidon Megaways WowPot!, Book of Atem WowPot!

Following the success of the Mega Moolah jackpot suite, Microgaming launched its new WowPot! suite, with each of its indie studios contributing to a different game. The most popular slot game in this suite is Sherlock & Moriarty WowPot! The old Victorian-themed slot is tied to the progressive WowPot! jackpots, but in the base game, you can find free spins and Mystery Free Spins.

Big Bass Bonanza

Big Bass Bonanza online slot.
  • Provider: Reel Kingdom (Pragmatic Play)
  • Volatility: Medium-High
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 95.7% to 96.7%
  • Progressive Jackpot: No
  • Similar Slots: Big Bass Bonanza Megaways, Bigger Bass Bonanza

There are a few classic video slots in the fishing theme that have become popular over the years, but easily one of the most popular slot games in this theme – and overall – is Big Bass Bonanza. Along with its ten paylines, you seek to collect fishermen to unlock free spins with multipliers, as well as catch the fish and their values on screen by landing a fisherman.

Big Bass Bonanza Megaways

Big Bass Bonanza slot.
  • Provider: Reel Kingdom (Pragmatic Play)
  • Volatility: High
  • Reels and Rows: Six Reels, Varied Rows
  • RTP: 95.7%
  • Progressive Jackpot: No
  • Similar Slots: Bigger Bass Bonanza, Big Bass Bonanza

After Big Bass Bonanza became one of the most popular slot games, developers Reel Kingdom – under Pragmatic Play – infused the Megaways format. Now, spinners can play a similar game to the original but with up to 46,656 paylines on any given spin, and you still play the familiar mechanic of landing the fisherman to catch the fish and their prizes.

Bigger Bass Bonanza

Bigger Bass Bonanza fishing online slot game.
  • Provider: Reel Kingdom (Pragmatic Play)
  • Volatility: High
  • Reels and Rows: Five Reels, Four Rows
  • RTP: 94.6% to 96.7%
  • Progressive Jackpot: No
  • Similar Slots: Big Bass Bonanza, Big Bass Bonanza Megaways

Bigger Bass Bonanza maintains the traditional video slot theme as opposed to adding in the Megaways, but makes the game bigger in a few ways. The fishing slot now has another row, two more paylines, and the biggest single fish has grown into a 4,000x your bet whopper! You do still get to collect fish wins with the fisherman and build up to multiplier free spins rounds.

Kingdoms Rise: Sands of Fury

Kingdoms Rise Sands of Fury slot game.
  • Provider: Playtech Origins
  • Volatility: High
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 96.2%
  • Progressive Jackpot: Yes
  • Similar Slots: Kingdoms Rise: Forbidden Forest, Kingdoms Rise: Reign of Ice, Kingdoms Rise: Battle Beast

Delving into the fantasy theme, the Playtech Origins progressive suite Kingdoms Rise spans a great many settings, but Kingdoms Rise: Sands of Fury is the most popular slot game of the bunch. Played on 20 paylines, you can spin for the Epic, Power Strike, or Daily Strike jackpots and the Wild Fury feature.

Cleopatra

Popular online slot game 'Cleopatra'
  • Provider: IGT
  • Volatility: Medium
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 95.7%
  • Progressive Jackpot: No
  • Similar Slots: Cleopatra II, Cleopatra Gold, Cleopatra Plus

Having been around since 2012, Cleopatra has earned quite the devout following in online casino circles, still standing as one of the most popular slot games around. With 20 adjustable paylines, you spin for the wild Cleopatra symbol, which is also the highest paying symbol in the game.

Mega Moolah

Mega Moolah online slot game.
  • Provider: Microgaming
  • Volatility: Medium
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 88.1%
  • Progressive Jackpot: Yes
  • Similar Slots: Mega Moolah Goddess, Immortal Romance Mega Moolah, Absolootly Mad: Mega Moolah

It’s impossible to understate the impact that Mega Moolah has had on online casino gaming, with the notorious millionaire-making progressive jackpot slot boasting world records for its payouts. The game that started it all remains its most popular, with any spin in its iconic safari theme having the potential to trigger a shot at one of the four jackpots.

Buffalo Blitz Megaways

Buffalo Blitz Megaways slot game
  • Provider: Playtech Origins
  • Volatility: High
  • Reels and Rows: Six Reels, Varied Rows
  • RTP: 96.3%
  • Progressive Jackpot: Yes
  • Similar Slots: Buffalo Blitz, Buffalo Blitz II

The third instalment to the Buffalo Blitz slots series now ranks as one of the most popular slot games at online casinos. Its eye-catching feature here is the Megaways infusion, which can deliver up to 117,649 paylines. During the gameplay on the North American plains, you’ll be looking to stack bison, bears, and trigger the selection of multiplier-powered free spins bonuses.

Age of the Gods

Characters from the Age of the Gods series of slot games
  • Provider: Playtech
  • Volatility: Medium
  • Reels and Rows: Five Reels, Three Rows
  • RTP: 95%
  • Progressive Jackpot: Yes
  • Similar Slots: Age of the Gods: Medusa and Monster, Age of the Gods: Epic Troy, Age of the Gods Norse: King of Asgard

For its mighty progressive jackpot suite, Playtech takes you to Mount Olympus to spin amongst the Greek pantheon. In the Greek mythology-themed slot, you’ll aim to trigger one of the four different free spins modes, harness the power of the towering Hercules Wild, and hopefully randomly trigger a jackpot drop along its both-way 20 paylines.

If you want to play one of the most popular slot games in the world, find one of the above right here at Casino.com. You can also check out our article about the biggest slot game winners to see if you can gain inspiration from the games they played when they won big.

Male pit boss illustration

Did You Know?

Believe it or not, the most popular online slots rarely change. Games such as Starburst, Gonzo’s Quest, Immortal Romance and Thunderstruck II have been top of players’ lists for years now. Having said that, Playtech’s new Goblin’s Cave (2022) slot has jumped right to the top of online slot charts.

Kelly has been writing about Bingo and online casinos for a number of years. She regularly contributes to the Casino.com blog and social media channels with all things casino-related.

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