A music-box lullaby stutters over Sanatorium Secrets’ loading screen, and the reels sit inside a derelict ward where the strip lights never quite settle. Two seconds in, the mood is set. What separates this slot from the rest of Pragmatic Play’s current horror output, though, lives underneath the art. Hook symbols drag every premium in their row off the board and leave wilds behind, block wilds carry multipliers up to 64x, and the free spins round is assembled piece by piece in a respin feature that plays before it starts. Nothing else in this release wave is put together this way, and the free demo below lets you watch the whole design in motion.
Pragmatic has dabbled in creature horror before. This game commits to the dread, backing the mood with three interlocked systems, each feeding the next.
The Hook lands nowhere except the outer reels, and it fishes inward. On arrival, it seizes every high-paying symbol in its row, converts each into a 1×1 wild, then becomes a matching premium itself so the row can still connect. If its sweep crosses a wild already on the board, that wild’s multiplier doubles. The inversion is clever, because the symbols you’d usually want to protect turn into something stronger, and this conversion is the only route 1×1 wilds have into the game at all.
Two wild formats hold the middle of the grid, and both cover every symbol except the two scatter types. The 1×4 fills any single reel from 2 to 5 and can turn up with a 4x or 8x multiplier attached. The 2×4 engulfs reels 3 and 4 together and can carry 8x, 16x, 32x or 64x. When several multipliers sit in one winning combination, they add together rather than compound, which tempers the top end but keeps every extra wild on screen meaningful.
The puzzle comes first.
Land three scatters on reels 2 to 5 and, before a single free spin plays, a respin round takes over those same four reels. It opens with three respins.
Each puzzle piece that hits restores a respin and banks one extra spin for the round waiting behind it. Fill a reel with pieces from top to bottom and that reel’s high payer spends the entire bonus as a wild. Hooks can latch onto reels 1 and 6 and persist through everything that follows, +1x tokens can raise the minimum multiplier the block wilds arrive with, and if pieces ever blanket all four middle reels the game stops there and pays the 10,000x maximum outright.
The round itself starts at six spins, plus two for every scatter beyond the third and one for each puzzle piece banked during the respins. A Super Scatter, which only visits reel 6, landing alongside three regular scatters upgrades the trigger to Super Free Spins and guarantees two Hooks that stay in play for the full round, shifting position on every spin.
No retrigger appears anywhere across the eight pages of rules, so the length you enter with is the length you play. Long bonuses in this slot are built in the puzzle, and they’re finished being built before the first spin turns.
Sanatorium Secrets divides its grid’s jobs more cleanly than most ways games. Wilds and scatters keep to reels 2 to 5, while reels 1 and 6 belong to the Hooks and, during the bonus, to the +1x tokens that raise wild multipliers. Wins pay 4,096 ways, left to right on adjacent reels, so coverage decides everything and the edges deserve more attention than they’d usually get.
During play, the difference between the two wild sizes matters. The 1×4 can fill any middle reel and tops out at 8x, while the 2×4 spans reels 3 and 4 with up to 64x attached, and either doubles when a Hook sweeps across it. In the puzzle respins, the priorities flip; you’re watching piece count rather than symbols, because each piece is a respin now and a free spin later, and covering the middle reels completely awards the game’s maximum win immediately.
Stakes start at $0.20, and the bet menu holds both side routes to the bonus. The ante doubles the cost of a spin and makes free spins four times likelier to land, while the buy panel lists two prices, 75x for a round that turns out regular or Super at random, and 150x for guaranteed Super Free Spins.
All four return figures sit in the rules. Standard spins run at 96.47%, the ante nudges that to 96.53%, the 75x buy slips to 96.42% and the 150x buy lands at 96.49%, making the ante the only route to the bonus that improves the RTP. A quiet argument for patience over purchase.
| Option | Cost | RTP |
|---|---|---|
| Standard spins | 1x stake | 96.47% |
| Ante bet | 2x stake | 96.53% |
| Buy Free Spins (random Super upgrade) | 75x stake | 96.42% |
| Buy Super Free Spins | 150x stake | 96.49% |
Ten regular symbols share the reels, four characters above six royals, shown here as multiples of total stake. The dark-haired patient tops the list and starts paying from a pair, something nothing else here does.
| Symbol | 2 reels | 3 reels | 4 reels | 5 reels | 6 reels |
|---|---|---|---|---|---|
| Dark-haired patient | 0.30x | 1x | 2.50x | 5x | 10x |
| Blonde patient | – | 0.40x | 0.70x | 2.50x | 5x |
| Elderly resident | – | 0.30x | 0.60x | 1.50x | 2.50x |
| The doctor | – | 0.30x | 0.50x | 1.20x | 1.50x |
| A, K | – | 0.20x | 0.40x | 1x | 1.20x |
| Q | – | 0.20x | 0.30x | 0.60x | 0.80x |
| J | – | 0.10x | 0.30x | 0.60x | 0.80x |
| 10, 9 | – | 0.10x | 0.20x | 0.40x | 0.50x |
The regular scatter stays on reels 2 to 5, and the Super Scatter stays on reel 6, and neither pays a coin on its own.
The Hook symbol, a reel-edge tool that strips the high payers from its row and leaves 1x1 wilds in their place, fronts the freshest slot design in Pragmatic Play's current horror wave, and the puzzle round backs it by letting you assemble the bonus before it plays. The one expectation to manage is the maths, which is medium-volatility and steadier than the theme implies.
Every system talks to the others. Hooks give the outer reels a purpose, the puzzle gives the bonus a construction phase with real stakes attached, and the multipliers those +1x tokens raise are the same ones a passing Hook can later double, so the ideas compound instead of sitting side by side.
The transparency deserves a mention too. All four RTP settings are printed in the rules, the paytable stretches down to a two-symbol win on its top character, and the full-coverage rule hangs a jackpot-style outcome over every puzzle round that most respin features simply don’t have.
Beneath the novelty sits a medium-volatility Pragmatic Play game that behaves exactly like one. Stretches between features can run quiet, the block wilds often land bare with no multiplier attached, and the design’s best moments depend on symbols that occupy just two of six reels. There’s no retrigger to rescue a short bonus either, and both buy options return slightly less than patient play does, so the drama the artwork promises turns up less often than a horror fan might hope.
Pragmatic’s output this year has leaned heavily on proven engines, sequels and reskins tuned rather than rethought, which is what makes this June 2026 release read like a statement. Three new systems arrive at once, all interdependent, none borrowed from an existing house engine. It’s a scoped claim, measured against the studio’s current wave rather than the whole market, but this review will stand by it; no recent stablemate matches Sanatorium Secrets for structural ambition.
The Hook is where the game is most honest about its own psychology. When one drops beside a row of premiums, the conversion is a proper event — wilds bloom along the row, and the board rewires itself in front of you. When it lands against nines and tens, almost nothing happens, and the small deflation is part of the design. That gap keeps the outer reels worth watching on every spin, a tension anyone who has played the Zeus vs Hades: Gods of War demo will recognise, though that slot manufactures it with raw volatility at far greater cost to a session.
The puzzle is the better trick, though. Bonus rounds usually open at their loudest moment and fade from there; this one opens with construction. Pieces stack, the respin counter refills, and every hit adds another spin to the round behind it, giving the feature a foundation phase nothing else in the studio’s current lineup offers. Hanging over it all is the coverage rule, since papering the four middle reels completely ends the whole affair at the full 10,000x on the spot.
The counterweight is that all this invention routes toward familiar maths. The volatility meter shows three bolts of five with Medium printed beneath it, the published hit rate sits just over 30%, and wild multipliers stack by addition, never multiplication. Anyone reading asylum horror as shorthand for violent swings should recalibrate; sessions run closer in temperament to the studio’s cuddlier Monster Superlanche slot than to anything nastier. The novelty is in how wins are put together, and the sizes stay ordinary more often than the theme lets on.
The limitation, then, is temperament. Sanatorium Secrets is the most inventive slot Pragmatic has shipped in months and one of its calmest, and no amount of fog on the loading screen changes the second half of that sentence. Come for the design, which is worth anyone’s free play; just don’t expect the ward to draw much blood.
