Top 5 online slot games

Editor's Note: Bonuses mentioned are for US residents with legal casino markets only.

From this list of 5 standout games, we’ve picked out the top five online slots. Even if they don't initially seem like your jam, consider giving them a spin purely for their high RTPs.  

9k Yeti: Best High Volatility Slot  

Slapping a number onto an online slot game was a slick move to get the game up front in a casino lobby, but that wasn't what 4ThePlayer was banking on to be the main draw when they put this game together. That 9k isn't just a random figure — it hints at the game's max payout, which is pretty impressive, even for a high volatility slot. 

9k Yeti plays on a 6x4 grid with 4096 ways to win. But what's really going to hit home for U.S. slot players is that stellar 97% RTP rate. 

The base game of 9k Yeti gets repetitive after a while, but it's just a warm-up for the free spins round. Landing three scatters gets you eight free spins, but if you hit six scatters, things get wild — you snag 88 free spins! And here's the kicker: a single retrigger adds another 50 free spins, with the potential to rack up to a whopping 880 free spins!

The action ramps up in 9k Yeti's bonus round when the ‘Snowstorm’ feature kicks in, offering a unique twist. If you simultaneously land a wild and a Yeti symbol, a snowstorm sweeps across the reels, reshuffling the symbols. This cool mechanic turns a potential loss into a win by guaranteeing a winning combination.

  • Software provider: 4ThePlayer
  • RTP: 97.0%
  •  Max payout: 9,012x  
  • Features: Snowstorm, free spins, wilds 
  • Where you can play the game: Caesars Palace Online Casino

3 Secret Cities: Most Innovative Bonus Feature  

It's no fluke that our top two slots both come from the same nifty London-based studio. 4ThePlayer have a flair for making slots that dazzle your eyes and pack a punch with features, not to mention high RTPs. This flair is in full swing with the 3 Secret Cities slot. The RTP in this game starts at 96.5% in the base game and soars to an impressive 98% in free spins rounds activated through the bonus buy feature. 

The game's setting could be ripped right out of an adventure novel with dense jungles and mysterious ancient temples. The soundtrack buzzes with chirps and calls of the wild, setting a perfect stage for a Lara Croft-style quest for treasure. And we're talking BIG treasure — you've got a shot at prizes going all the way up to 50,000x. 

You can trigger free spins by landing scatters on reels 1, 3, and 5. If you miss one, the BONUS↑UP feature saves the day. You'll uncover a prize up to 50x or get a bonus boost, catapulting you to a higher-tier city the next time you activate free spins. To give you an idea, starting in the first city (Jungle City), you get up to 12 free spins with a 4x multiplier. But make it to the final city (Gold City), and you're looking at a whopping 50 free spins with a 15x multiplier. 

In our run, we made it to Lake City, the middle tier, and the prizes were impressive — 25 free spins with an 8x multiplier attached. 

  • Software provider: 4ThePlayer  
  • RTP: 96.5% (98% using the Bonus Buy feature) 
  • Max payout: 50,000x
  • Features:  BONUS↑UP, multipliers, wilds, super stacked symbols 
  • Where you can play the game: BetMGM Casino 

Apollo Pays: Best Megaways Slot 

Taking on an overused theme is always a gamble, but Big Time Gaming pulls it off brilliantly with Apollo Pays. They're the brains behind the Megaways mechanic, and they've woven their magic into this Greek-themed slot. The artwork is a visual feast offering an aerial view of Mt. Olympus and exquisitely crafted Greek structures. The tranquil sound effects complement this scene perfectly, setting the stage for some ethereal spinning action. 

The game harnesses the Megaways engine, presenting 117,649 ways to win on each spin. But that’s just a glimpse of the extras this game has to offer. A highlight for us is the Win Exchange option, which lets players trade a big win (100x or more) straight up for entry into the free spins round.  

Then there's the always-on re-spin feature: hit a win, and those winning symbols lock while the others take another whirl, giving you another shot at striking it big. 

The free bonus spins round in Apollo Pays might look like your usual fare, but there's a twist: an exponentially increasing multiplier. It starts at 1x and increases by one each time a scatter appears on the reels. We managed to ramp it up to 10x, but anyone's guess is how high it will go. 

If those features haven't wowed you yet, the game's monster payout potential of up to 116,030x your stake surely will. And no, that's not a typo. 

  • Software provider: Big Time Gaming 
  • RTP: 96.51%
  • Max payout: 116,030x
  • Features: Megaways, sticky symbols, free spins, multipliers, Win Exchange 
  • Where you can play the game: Betrivers Casino 

Ghostbusters Triple Slime: Best Free Spins Bonus Round 

Gear up for some spectral action with Ghostbusters Triple Slime by IGT. This sequel picks up where the original 2012 Ghostbusters slot left off, drawing its spooky charm from the classic '84 poltergeist movie. The follow-up comes with sharper graphics, and a few in-game features are thrown into the mix. It's the ghost-chasing thrill you know and love, reimagined with a modern twist. 

With the provider's MultiWay Xtra mechanics in play, Ghostbusters Triple Slime offers 720 ways to win on each spin, and you can form winning combos from either side. What’s more, the game plays on a quirky hexagonal reel configuration. 

The moment we fired up Ghostbusters Triple Slime, the unmistakable Ghostbusters shoutout hit us, so it was a blast from the past. This was quickly followed by a catchy electronic disco beat that just nails the mood for the ghost-busting adventure ahead. We found ourselves drawn into the dark, eerie streets of New York City, the heart of all the spectral action.  

The symbols in Ghostbusters Triple Slime pay a true homage to the Ghostbusters universe, featuring crisp stills of the three main parapsychologists, the Ecto-1A, the P.K.E. Meter, the Keymaster helmet, and the ever-important proton pack. 

Ghostbusters Triple Slime features a pair of bonus rounds. The Slimer Scatter bonus kicks off when you land three Slime Scatter symbols, transforming into prize wheels that offer big coin multipliers. The more scatters you hit, the more wheels and bigger multipliers appear, with up to 3,850x coins at stake. Then there's the Triple Slimer Scatter bonus, where landing three or more bonus scatters lets you pick from ghosts to earn pointers for three colorful prize wheels that spin out instant prizes and multipliers.  

  • Software provider: IGT 
  • RTP: 96.08%  
  • Max payout: 2,919x 
  • Features:  Triple Slime, Slimer Scatter Bonus 
  • Where you can play the game: FanDuel Casino 

Bloodsuckers: Highest RTP 

Ten years out, NetEnt's Bloodsuckers is still a hit in the online slot scene. What's keeping it on top? That massive 98% RTP is one of the highest you'll find among U.S. online slots today. 

The game's look holds up well, too. Sure, it can't compete with newer games and their ultra-HD graphics, but it's got that creepy, cool vampire vibe down pat. The game's full of eerie, classic vampire items — you've got your holy water, bibles, garlic, and the big guy, Vlad the Impaler, a.k.a. Lord Dracula. He's not just there for spooks; he's the key to the big bucks as the highest-paying symbol in the game. 

Bloodsuckers boasts a combo of neat bonus features. You've got the pick-and-click, where you crack open coffins to reveal hidden prizes — a fun, hands-on part of the game. And when you hit three or more scatters, you're in for the free spins round. Here's the cool part about that feature: all winnings you rack up in the free spins will get tripled. 

If Bloodsuckers sounds like something you might be interested in, don't miss out on Blood Suckers 2. The sequel takes everything up a notch with crisper graphics and loads more features. And for something fresh, give the Bloodsuckers Megaways version a spin. Brought to you by Red Tiger, this new release adds a whole new dimension to the Bloodsucker series with Megaways gameplay. 

  • Software provider: IGT 
  • RTP: 98%  
  • Max payout: 1,014x 
  • Features:  Free spins, click & reveal 
  • Where you can play the game: bet365 Casino