Sanatorium Secrets

Sanatorium Secrets is a horror-themed video slot developed by Pragmatic Play, released on June 1, 2026. The game is set inside a decaying mental institution and pairs that atmosphere with a mechanical depth that goes beyond standard free spins fare.

The defining feature is a two-part bonus structure: a Puzzle Respin round plays out before Free Spins begin, setting the minimum wild multiplier value for everything that follows. On top of that, Hook symbols transform high-paying symbols into wilds mid-spin, and two distinct wild types — one reaching multipliers of up to 64x — can both appear in the same game round.

The game runs on a 6x4 grid with 4,096 ways to win, a 96.47% base RTP, medium volatility, and a 10,000x maximum win. It is built for players who engage with feature mechanics rather than those looking for a passive spin-and-wait experience.

Sanatorium Secrets is built around the asylum horror genre. The main grid sits in a courtyard surrounded by misty, worn-down institutional buildings. The color palette is heavily desaturated — greys, cold greens, and deep shadow — with selective lighting used to draw attention to symbols and feature events.

The four premium symbols are character portraits: a pale young woman in white, a blonde woman, an older man, and a surgeon in scrubs. Each is drawn with enough detail to reinforce the setting without becoming gratuitously graphic. Low-paying symbols use playing card values (9 through A) styled to look carved or scratched into grimy surfaces, with spiders incorporated into each design.

Animations are controlled and purposeful. Wild fills and Hook transformations play out with clear visual feedback. The audio layer uses low ambient tones and environmental sounds in the base game, with sharper audio cues activating during bonus events. The overall presentation is polished and consistent with the theme throughout.

Sanatorium Secrets uses a 6x4 grid with 4,096 ways to win. Wins pay left to right on adjacent reels, starting from reel 1. There are no fixed paylines.

• Set your stake using the bet controls. Bets range from $0.20 to $240 per spin.
• Activate Ante Bet by paying 2x your current stake. This increases the Free Spins trigger frequency fourfold and raises the active RTP to 96.53%. Maximum total bet with Ante enabled is $480.
• Review the paytable via the information button. It covers all symbol values, wild types, and full feature rules.
• Use Bonus Buy to access the feature directly — 75x stake for a random trigger of Free Spins or Super Free Spins, or 150x to guarantee Super Free Spins.
• Spin and allow Hook symbols, wild multipliers, and scatters to activate through standard play.

1x4 Expanding Wilds

These wilds land on reels 2 to 5, expand to fill the full reel, and carry multipliers of up to 8x. They are active in both base and bonus play and substitute for all symbols except scatters.

Bonus Buy Option: No

2x4 Fiery Wilds

A larger variant that covers reels 3 and 4 simultaneously as a 2x4 block. These carry multipliers of up to 64x. When more than one wild contributes to a single win, multipliers combine. Active in base and bonus play.

Bonus Buy Option: No

Hook Symbol

Hook symbols land on reels 1 and 6 only. When they land, all high-paying symbols on the same row are converted into 1x1 wild symbols, and the Hook then transforms into that same symbol. This creates additional wild positions without requiring a standard winning combination to be present first.

Bonus Buy Option: No

Puzzle Respin (Pre-Bonus Round)

Before Free Spins begin, the Puzzle Respin round activates. Puzzle piece symbols land on the grid, and each one that lands can award additional respins or free spins. Each piece also raises the minimum wild multiplier value that will apply throughout the entire Free Spins round that follows. Completing the full puzzle immediately awards the maximum win.

This stage is what makes the bonus structure distinctive — the Puzzle round actively shapes the conditions of the Free Spins before a single one is played.

Bonus Buy Option: No (triggered as part of the scatter bonus sequence)

Free Spins

Landing three or more scatters on reels 2 to 5 triggers the bonus game. Three scatters award 6 free spins, with 2 additional spins for each extra scatter. The Puzzle Respin plays out first, then Free Spins begin with the minimum wild multiplier established in that round. All wild mechanics remain active throughout.

Super Free Spins is an enhanced version of the feature with more favourable starting conditions.

Bonus Buy Option: Yes

• 75x stake: randomly triggers Free Spins or Super Free Spins
• 150x stake: guarantees Super Free Spins

All symbols pay from left to right on adjacent reels, starting from the leftmost reel. The game has four high-paying character symbols and six low-paying playing card symbols (9 through A). Payouts below are based on a $1.00 stake.

High-Paying Symbols

Low-Paying Symbols

Special Symbols:

• 1x4 Wild: Expands to fill reels 2–5. Carries up to 8x multiplier. Substitutes for all except scatters.
• 2x4 Fiery Wild: Covers reels 3 and 4. Carries up to 64x multiplier. Multipliers combine when multiple wilds contribute to a win.
• 1x1 Wild: Created by the Hook symbol from converted high-paying symbols. Active on reels 2–5.
• Hook Symbol: Lands on reels 1 and 6. Converts high-pays on the same row into 1x1 wilds, then transforms into that same symbol.

Scatter: Lands on reels 2–5. Three or more trigger the Puzzle Respin and Free Spins.

Wins form when matching symbols land on adjacent reels from left to right, starting from reel 1. The 4,096-ways format means symbols do not need to align on a fixed payline — any matching position across adjacent reels counts.

The base game hit frequency sits at approximately 1 in 3.32 spins, meaning roughly 30% of spins produce a paying outcome. This is driven by the wide ways structure combined with the active wild mechanics.

Wild multipliers are the primary win-boosting mechanic. The 2x4 Fiery Wild reaches up to 64x on its own, and when combined with a 1x4 wild, multipliers stack. The Hook symbol adds coverage by generating additional wilds mid-spin from existing high-paying symbols.

The largest wins are concentrated in the Free Spins round, where the minimum wild multiplier is set by the Puzzle Respin stage before the feature begins. The maximum win of 10,000x is achievable, with a hit frequency of 1 in 1,225,490 spins.

There is currently no direct sequel or alternative version of Sanatorium Secrets. Players who enjoy the game's mechanics may find similar experiences in other Pragmatic Play horror-themed titles such as Haunted Crypt (released March 2026) or Cult (March 2026), both of which share a dark visual style. For similar wild multiplier mechanics within the Pragmatic Play catalogue, Second Thunder is a comparable option with a related feature structure.

Sanatorium Secrets is one of the stronger Pragmatic Play releases of 2026. The 96.47% RTP sits above the provider's recent average, and the two-part bonus structure — Puzzle Respin feeding directly into Free Spins — adds strategic depth that is uncommon in medium volatility slots. The Hook symbol and layered wild multipliers keep the base game engaging between bonus triggers.

The main drawback is complexity: the feature chain takes time to understand, and casual players may find the rules dense. The 10,000x maximum win is also below some competitors in the horror slot category.

Best suited to players who engage with mechanics and want a bonus feature that builds rather than simply resets.