Sanatorium Secrets

By Becky Mosley | Updated 5 June 2026

A condemned building. Misty corridors. Patients who look like they know things you’d rather not. Pragmatic Play‘s Sanatorium Secrets launched on the 1st June 2026 and commits to the asylum horror aesthetic in a way that is genuinely unsettling rather than Halloween-costume cheap. The real question is whether the mechanics are worth being locked inside this horror show.

The slot has six reels, four rows, and 4,096 ways to win. The 10,000x max win and medium volatility are not the most extreme spec sheets you’ll read, but pair a decent RTP of 96.47% with multiplier wilds up to 64x per symbol, and there’s real money during the bonus rounds.

Quick Facts

Technical Features

The slot has six reels across four rows, producing 4,096 ways to win. The published RTP of 96.47% is fair. The catch? Pragmatic Play offers multiple RTP variants, and some operators may include lower RTPs of 95.47% or 94.49%. Volatility is rated medium, so the swings won’t floor you, but the 10,000x max win is considered favourable. An Ante Bet option is available; it doubles your stake in exchange for 4 times the bonus trigger frequency, with RTP reportedly nudging up to around 96.53% as a result. The slot is available on desktop and mobile devices, with bets ranging from 20p to £240 per spin. (Note, in the UK, the max bet per spin is capped at £5 for 25 years and older and £2 for 18 to 24 year olds)

Design and Theme

Pragmatic Play has gone all-in on psychological horror with Sanatorium Secrets. The action unfolds inside a crumbling asylum where stained walls, flickering lights, rusting metal fixtures, and long-forgotten corridors suggest things went wrong here a very long time ago. The symbol set is populated by unsettling patients and grim-faced staff members who look like they’d be best avoided altogether.

The graphics do a solid job of selling the setting, but it’s the sound design that steals the show. Distant footsteps echo through the halls, muffled groans drift in from somewhere unseen, and an underlying sense of tension hangs over every spin. Rather than relying on cheap shocks or over-the-top horror clichés, the game slowly builds an atmosphere of unease that lingers throughout the session. Some will find it deliciously creepy, while others may decide one visit to this sanatorium is more than enough. Either way, the production values are hard to fault.

Bonus Features

Landing 3 Scatter symbols triggers the Bonus Game, but there’s an even faster route into the action. If a Super Scatter appears alongside 3 Scatters, the game skips the standard bonus entirely and awards Super Free Spins instead.

The bonus rounds are where Sanatorium Secrets starts to reveal its more dangerous side. Multiplier Wild symbols can grow to a hefty x64, creating the potential for some sizeable payouts when they land in the right positions. Hook symbols add another layer of unpredictability by pulling in neighbouring symbols and transforming them, often changing the entire layout of the reels in the process.

Before the Free Spins feature begins, a Puzzle phase takes place. Rather than serving as a decorative extra, this stage helps shape the upcoming bonus round, making the outcome feel a little less like a simple press of a button and more like something building behind the scenes.

For anyone unwilling to wait for the Scatters to land, Sanatorium Secrets includes several Bonus Buy options. The standard Bonus Game can be purchased for 75x the bet, while a 150x the bet triggers the Super Free Spins. As expected, Autoplay is available for those content to sit back and see what unfolds inside the sanatorium.

How to Play

Where to Play

Sanatorium Secrets is widely available at UK-licensed online casinos featuring Pragmatic Play’s games portfolio. If you’re looking for a place to start, take a look at Slotfruit’s casino reviews, where you’ll find the latest welcome offers and promotions available to UK players. Before playing, it’s always worth checking the game’s information panel, as RTP settings can vary between operators and may differ from the headline figure quoted in reviews.

Sanatorium Secrets FAQ

✅ Who developed Sanatorium Secrets?

Sanatorium Secrets is developed by Pragmatic Play and was released in June 2026.

✅ What’s the RTP?

The best available RTP is 96.47%, but some operators offer lower variants at 95.47% or 94.49%. Check your casino’s specific published RTP before playing – it makes a difference over time.

✅ What’s the max win?

The max win is 10,000x the bet. It’s achievable primarily through the Super Free Spins feature, where multiplier wilds can reach x64.

✅ Where can I play Sanatorium Secrets in the UK?

The game is available at UK-licensed casinos operating Pragmatic Play titles. Check Slotfruit’s casino reviews for current options and welcome offers.

Becky Mosley

Founder & Editor-in-Chief at Slotfruit

Rebecca (Becky) Mosley has been at the heart of the UK online gambling industry since 2008 — making her one of the most experienced voices in the space. She founded Take Marketing Limited and built SlotFruit.co.uk into one of the longest-running independent casino comparison sites in the country.

As editor-in-chief, Becky brings a genuine player-first perspective to everything on the site. She personally oversees every casino review and slot guide, making sure readers get straight-talking, honest information rather than marketing fluff. Her approach has always been the same: transparency, fair bonus terms, and responsible gambling above all else.

Over 17 years in the industry, Becky has built deep expertise across UK Gambling Commission licensing, slot game mechanics, bonus structures, and the constantly evolving regulatory landscape. She works directly with operators and software providers to keep every listing accurate and up to date.

Becky is a Companies House registered director (Take Marketing Limited, company no. 07619813) and is based in Lincolnshire, England.

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