The world of online slots is home to dozens of different themes. Among the most popular – particularly around Halloween time – is the horror genre. Blending creepy characters with spine-chilling features, these scarily good games are sure to provide their fair share of thrills and spills.

We’ve dug deep to pull out our own top 5 picks: the very best horror-themed slots ever made (in our opinion!). They provide gruesome gameplay, heart-stopping prizes and terrifying sound effects that are sure to keep you on the edge of your seat.

NOTE: Screenshots on this page are taken playing for real money at Casumo. You can click the buttons under each mini review to play at one of our recommended casinos. For more options for your slot play, check out our list of UK slot sites.

Rotten By The Numbers

• RTP: 96.08%
• Variance: High
• Top Win: 66,666x
• Reels: 5
• Rows: 4
• Paylines: 108+
• Release Date: August 2021

The first of our top-rated horror slots is Rotten, a 6-reel game that takes us along the well-trodden zombie apocalypse path. However, this Hacksaw Gaming release also throws in all kinds of stereotypical elements from other gruesome movies. 

Set in an abandoned fairground, you can expect to encounter Pennywise-style creepy clowns, mad scientists and other hellish characters on the reels. A maximum win of 10,000x awaits the boldest of players who escape the bloodthirsty clutches of the zombified hordes. 

Like many of the titles featured in this list of the best horror slots, Rotten is a high volatility game. But unlike the others, this particular release boasts the intriguing SwitchSpins™ mechanic, featuring respins and random wilds.

The game’s Return To Player rate varies from site to site, but it’s possible to find an RTP as high as 96.27%. So remain alert and watch out for casinos offering the best value, as well as the hideous undead creatures hunting you down.

• RTP: 96.27%
• Variance: High
• Top Win: 10,000x
• Reels: 6
• Rows: 5
• Paylines: 35
• Release Date: December 2022

Controversial slot developer Nolimit City has created one of the most unique and intriguing game catalogues in the industry. And no portfolio of slots would be complete without the inclusion of at least one horror-themed title. 

Enter Mental, a 5×3 video slot that conjures up images of the horrifying serial killer Hannibal Lecter. A suitably demonic maximum payout of 66,666x awaits players brave enough to enter the asylum. What’s more, the game’s bet limits range from £0.20 to £70, appealing to all tastes. Well, perhaps not the taste for human flesh.

A solid RTP of 96.06% is teamed with an extremely high volatility level, rather than a nice Chianti. And the game’s horrifically-titled Dead Patient feature offers the chance to lock up multipliers as big as x9,999.

Extremely highly rated by slots fans, Mental is a very dark, but thoroughly enjoyable release. Although the paytable seems a little complex at first, the world is more interesting with this game in it, Clarice.

• RTP: 96.11%
• Variance: High
• Top Win: 2,500x
• Reels: 5
• Rows: 3
• Paylines: 10
• Release Date: March 2018

This thrilling game by award-winning developer Play’n GO is sure to appeal to dedicated slots fans. House of Doom features a dark, gothic theme, set in an mysterious, abandoned mansion. 

Visually impressive, the graphics are detailed and somewhat ethereal, immersing you in the eerie atmosphere. But perhaps most appealingly, this is a branded slot, featuring doom metal band Candlemass. So as you might expect, the soundtrack is heavy and contributes to a real sense of dread.

With a fairly standard RTP of 96.11%, House of Doom features a similarly typical 5×3 grid of reels with 10 paylines. The minimum bet of just £0.10 and upper limit of £100 ensures the game is accessible to players of all budgets. Although the high variance may not appeal to some, a maximum win of 2,500x is terrifyingly good.

The signature feature of this ghoulish game is the “Doom Spins” bonus game. Once activated, scatters become wild and can trigger respins, leading to spook-tacularly sized potential payouts.

• RTP: 96.28%
• Variance: Medium-High
• Top Win: 3,000x
• Reels: 5
• Rows: 3
• Paylines: 20
• Release Date: October 2018

What collection of horror slots would be complete without a game that references the spookiest time of year? Enter Halloween Jack, which is essentially a reskin of Jack And The Beanstalk, an all time classic NetEnt slot.

Set in a creepy graveyard, this release is crammed with Halloween-inspired imagery, including bats, skulls and of course, pumpkin lanterns. Don’t be spooked by the lightning flashes which randomly appear during gameplay, along with a host of other cool visual effects. 

Halloween Jack is a 5×3 slot featuring a healthy RTP of 96.28% and a maximum payout of 3,000x per spin. Bet limits range from £0.20 to £100, suitable for all bankroll sizes, while the action takes place to a grim, haunting soundtrack.

Perhaps the most interesting element of this game though, is the free spins bonus round. Here you can find stacked and expanding wilds, along with respins, to trigger some monstrous payouts.

• RTP: 96.72%
• Variance: High
• Top Win: 61,720x
• Reels: 6
• Rows: 4
• Paylines: 4,096
• Release Date: October 2022

Vampires are a classic horror movie trope, but you’ll find dozens of slots in this genre too. However, this Big Time Gaming title is surely among the best examples of a well-made vampire-themed slot.

For one, Castle of Terror is beautifully designed. From the other-worldly mansion in the background, to the portraits of the various characters on the reels, the artwork is simply stunning. 

These individuals are seemingly ordinary residents of the castle; the lord and lady, plus a maid and a groundskeeper. But during either of the game’s two free spins bonus rounds, you’ll notice they change into terrifying vampiric forms, baring their razor-sharp, blood stained teeth. 

It’s during these bonus games where players stand the best chance of securing the staggering maximum payout of 61,720x. While the game’s RTP is considerably above average too, at 96.72%.

In this article, we revealed our five favourite examples of horror-themed slots that are sure to appeal to your morbid side. But there’s an abundance of casino slots available today that will undoubtedly entertain fans of ghouls, ghosts and gore. 

Whether you enjoy playing for real money, or spinning the reels for fun, our top-rated online gambling sites are jam-packed with spooky slots.