Sanatorium Secrets (Pragmatic Play) – Slot Review
Sanatorium Secrets is built around a dark, horror-inspired hospital setting, drawing on the atmosphere of an abandoned sanatorium or asylum. The theme centres on mystery, tension, and the feeling of exploring a place filled with hidden stories and unsettling discoveries.
Visually, the game leans into a moody and eerie aesthetic, with dim lighting, shadowy interiors, and character symbols that reinforce the unsettling tone. The environment feels confined and clinical, yet distorted, blending traditional medical imagery with a more sinister, supernatural edge.
At its core, the theme revolves around discovery and transformation, reflecting the idea of uncovering secrets within a restricted, mysterious location. This is mirrored in the gameplay, where symbols evolve, shift, and reveal new values as the feature progresses—similar to peeling back layers of a hidden narrative. Overall, Sanatorium Secrets delivers a tense and immersive horror theme, combining a haunted medical setting with evolving mechanics to create a darker, more atmospheric slot experience.
Sanatorium Secrets is played on a 6-reel, 4-row layout featuring 4,096 ways to win. The game offers medium volatility, a return-to-player (RTP) of 96.47%, and a maximum win potential of up to 10,000x the stake. Bets range from £0.20 to £240 per spin.
Sanatorium Secrets Symbols & Pay Table
The game includes 14 symbols in total. Low-value symbols are represented by card ranks (9, 10, J, Q, K, and A), while premium symbols consist of character icons with coloured backgrounds. The highest-paying symbol is the blue character, awarding up to 10x for six of a kind. Special symbols include Wilds, Hook symbols, Scatter symbols, and Super Scatter symbols. Scatters appear on reels 2 to 5, while the Super Scatter is exclusive to reel 6.
Sanatorium Secrets Features & Mechanics
Wild Symbols & Hook Mechanic
The game features multiple Wild types, each with unique behaviour and multiplier potential:
- 1×4 Wilds appear on reels 2 to 5 and can carry random multipliers of 4x or 8x.
- 2×4 Wilds appear on reels 3 and 4 only and offer higher multipliers ranging from 8x up to 64x.
All Wild multipliers are additive when contributing to the same win.
The Hook symbol, appearing on reels 1 and 6, plays a key role in enhancing wins. When activated, it collects high-paying symbols along its row, transforming them into Wilds while also converting itself into a matching premium symbol or cluster. If the Hook interacts with existing Wilds, it doubles their multipliers, further increasing win potential.
Additional 1×1 Wilds can also be created through Hook interactions, acting as standard substitutes for regular symbols.
Free Spins & Puzzle Feature
Free Spins are triggered by landing 3 or more Scatter symbols, while adding a Super Scatter activates the enhanced Super Free Spins feature.
Before Free Spins begin, players enter the Puzzle feature, which determines key elements of the upcoming bonus. This stage starts with 3 respins, and additional respins are awarded whenever puzzle pieces land. Each puzzle piece also grants +1 extra free spin for the main feature.
As reels fill vertically with puzzle pieces, high-paying symbols may transform into Wilds that carry into the Free Spins round. During this phase, Hook symbols may also appear and, if triggered, will persist throughout the bonus, appearing on every spin.
Additionally, multiplier upgrades can appear, increasing the minimum multiplier values for Wild symbols during the subsequent feature. If the Puzzle grid is fully completed, the maximum win is instantly awarded.
Free Spins & Super Free Spins
The Free Spins round begins with 6 spins, plus 2 additional spins for each Scatter beyond the initial trigger. Extra spins are also awarded based on puzzle pieces collected during the Puzzle feature.
During the feature, previously unlocked Wilds can appear, and Hook symbols continue to interact with the grid, transforming and enhancing Wilds further. When Hooks pass over transformed Wilds, they revert them to smaller Wilds while doubling their multipliers, creating additional opportunities for high-value combinations. The Super Free Spins variant enhances this further, with guaranteed Hook symbols carried over from the Puzzle phase.
Ante Bet & Buy Feature
Players can activate an optional Ante Bet, increasing the total stake in exchange for a higher chance of triggering Free Spins.
The Buy Feature allows direct access to the bonus:
- 75x bet – Random Free Spins or Super Free Spins
- 150x bet – Guaranteed Super Free Spins
Conclusion
Sanatorium Secrets delivers a layered gameplay experience built around its evolving Wild system and the two-stage bonus structure. The base game introduces solid potential through Hook interactions and expanding Wild multipliers, but the real depth comes from how these mechanics carry into the feature.
The Puzzle phase adds an extra level of setup, giving players the chance to build stronger conditions before Free Spins even begin. When combined with persistent Hooks and upgraded Wilds, the bonus can quickly escalate, especially in the Super Free Spins variant where consistency is noticeably higher. Be sure to try out this game on launch and check out our exclusive casino offers.