Sanatorium Secrets Demo Play Free Demo Slot

Slot Overview

Sanatorium Secrets is a highly volatile horror-themed online slot by developer Pragmatic Play. This rare foray into the more adult slot space by Pragmatic features free spins, a unique hook mechanic, and wins up to a maximum of 10,000x the bet.

Gameplay & Bonus Features

Pragmatic’s Sanatorium Secrets is a 6-reel, 4-row slot game with 4,096 ways to win, where payouts are awarded when matching symbols connect from left to right. Staking options begin at a minimum of €0.20 a spin to a maximum of €240, with the game featuring a high RTP of 96.46%.

The game uses a mix of wild symbol sizes that only appear across the middle reels.

The 1×4 wild stretches across a full reel position and can land on reels 2 to 5. When it appears, it can carry a multiplier, which applies to any win that runs through it. If more than one multiplier is involved in the same win, they are added together.

The larger 2×4 wild appears on reels 3 and 4 and comes with higher multiplier values. Like the smaller version, its multiplier applies to any connected win and stacks with others in the same combination.

There’s also a 1×1 Wild, which doesn’t land naturally. Instead, it’s created during play when other symbols are transformed.

The Hook symbol appears on reels 1 and 6 and is where things get more active. When it lands, it pulls in high-paying symbols from its row, turning them into matching symbols or clusters while also converting them into 1×1 Wilds. If it passes over existing Wilds, it boosts their multipliers, which can quickly increase the value of any connected wins.

Free spins & Puzzle feature

Free spins are triggered by landing 3 or more scatters, while adding a super scatter upgrades the feature into the stronger version.

Before the spins begin, a puzzle feature plays out. This works on a respin system, starting with 3 spins and extending whenever new puzzle pieces land.

As pieces fill the reels, they can transform high-paying symbols into wilds for the upcoming free spins. Each piece that lands also adds extra spins to the feature, building up the total before it even starts.

Hook symbols can also appear during this stage, and any that land will carry over into the Free Spins, appearing on every spin in random positions. If the feature is triggered with a Super Scatter, two hooks are guaranteed, giving a stronger setup from the start.

There’s also a chance to increase the minimum multiplier that the 1×4 Wilds can land with, adding another layer of potential going into the bonus.

If the puzzle completely fills the middle reels, the feature ends immediately with the maximum outcome.

Free spins & Super Free Spins

The free spins round starts with a set number of spins, with extra spins added based on both the triggering scatters and how many puzzle pieces landed beforehand.

Wilds created during the Puzzle feature can appear throughout the bonus, and Hook symbols continue to play a role on every spin. When a Hook passes over a transformed symbol, it converts it into a 1×1 Wild and boosts its multiplier, keeping the values moving throughout the feature.

The upgraded version follows the same structure but starts with stronger conditions, giving more hooks and a higher overall potential from the beginning.

Theme & Design

We’ve seen Pragmatic develop horror-themed slots in the past, with the likes of Zombie School Megaways and Zombie Carnival springing to mind, but generally, the studio’s releases in this genre are much softer and have more of a cartoon feel to them.

That’s certainly not the case with Sanatorium Secrets, with the theme leaning more into an actual horror-style movie with some jumpy moments in the gameplay and a few animations that might catch you off guard and give you a bit of a scare.