Key figures
Useful before the first spin, when you compare the RTP versions and the cap on wins.
| Game figure | Set figure |
|---|---|
| Game provider | Pragmatic Play |
| Return to player | 96.42% / 96.47% / 96.49% |
| Volatility | Medium |
| Grid size | 6x4 |
| Maximum win multiple | x10,000 |
| Maximum win in money | A$4,800,000 |
| Release date | 01/06/2026 |
6x4 grid with 4096 ways to win, read from left to right. Sanatorium Secrets is a horror video slot with a Victorian theme and a cool, foggy sanatorium behind the reels. A win needs only 2 matching symbols in a row from reel 1, and the game counts every matching path, so one spin can pay in many ways at once.
3 SCATTER symbols on reels 2 to 5 trigger Free Spins, but a jigsaw Puzzle Feature comes first and replaces the reels. The puzzle starts with 3 respins, and each piece adds 1 respin and 1 free spin. Inside Free Spins, Stacked Wild and Multiplier combine on 1x4 and 2x4 WILDs. Super Free Spins need a SUPER SCATTER and guarantee 2 HOOKs.
75 times the bet buys Free Spins at A$375 when the bet is A$5, and Super Free Spins costs 150 times the bet or A$750.
| Buy option | Bet multiple | RTP |
|---|---|---|
| Free Spins buy at 75x | x75 · A$375 | – |
| Super Free Spins buy at 150x | x150 · A$750 | – |
96.42 to 96.49 percent: this is the share of each A$100 staked that returns to players over time, and the game rules show which version runs here.
| RTP level | RTP | Provider default |
|---|---|---|
| Variant 1 | 96.49% | No |
| Variant 2 | 96.47% | Yes |
| Variant 3 | 96.42% | No |
Symbol payouts
The payouts below are in money at the example bet of A$0.50, and more matching symbols pay more.
| Win value | 3+ | 4+ | 5+ | 6+ |
|---|---|---|---|---|
 Dark-Haired Woman | A$0.50 | A$1.25 | A$2.50 | A$5 |
 Blonde Woman | A$0.20 | A$0.35 | A$1.25 | A$2.50 |
 Older Man | A$0.15 | A$0.30 | A$0.75 | A$1.25 |
 Man with Glasses | A$0.15 | A$0.25 | A$0.60 | A$0.75 |
 A | A$0.10 | A$0.20 | A$0.50 | A$0.60 |
 K | A$0.10 | A$0.20 | A$0.50 | A$0.60 |
 Q | A$0.10 | A$0.15 | A$0.30 | A$0.40 |
 J | A$0.05 | A$0.15 | A$0.30 | A$0.40 |
 10 | A$0.05 | A$0.10 | A$0.20 | A$0.25 |
 9 | A$0.05 | A$0.10 | A$0.20 | A$0.25 |
Round walkthrough
Shows the order of a round, from choosing a bet to the point where you stop.
Each spin starts with a bet between A$0.20 and A$480. Your bet sets every win and every feature cost, so choose it before the first spin.
Wins form left to right across the 6x4 grid, with 4096 ways to win. Two matching symbols on consecutive reels from reel one are enough to pay.
Scatters on reels 2 to 5 count toward the bonus, and a HOOK can land on reels 1 and 6. Wild and Stacked Wild symbols join wins.
A jigsaw puzzle with 3 respins comes first, whenever three or more Scatters land. Free Spins then start with 6 spins, plus 2 per extra Scatter and 1 per puzzle piece.
Set a session budget before the first spin, and stop when it runs out. Help is at the National Gambling Helpline, 1800 858 858.
Feature rules
Not sure how a bonus starts? Here is each step before the first spin.
3 respins open the Puzzle, which comes before every Free Spins and Super Free Spins round. A jigsaw board replaces the reels. Each piece adds +1 respin and +1 FS. HOOKs may hit on reels 1 and 6, and Super Free Spins guarantees 2 HOOKs.
Free Spins triggerRespins plus spins
6 spins start Free Spins once 3 or more SCATTER land on reels 2-5. Each extra SCATTER adds 2 spins, and each puzzle piece adds 1 more. A fire-and-smoke backdrop frames the round. 1x4 and 2x4 WILDs carry multipliers, and a HOOK can appear on each spin.
Puzzle boardSpins with multipliers
3 SCATTER and 1 SUPER SCATTER trigger Super Free Spins, after a Puzzle that guarantees 2 HOOKs. The round plays like Free Spins with a minimum WILD multiplier boost of +1x. On the final spin, WILD RIOT shows dripping red multiplier text on the WILDs.
Super Scatter landingBoosted multipliers
6x4 grid with 4096 ways to win, counted left to right. HOOKs can appear on reels 1 and 6. The cool, foggy Victorian sanatorium background sets the base game.
Game lobbyWays to win
Game views
After this gallery, you will have seen a win, the puzzle and both free spins screens.
Try before you bet
Settles which version to open first and what the real game requires before the first spin.
The demo needs no money and pays nothing, so it shows the reels and features only. The real game needs a Winshark Casino account and players aged 18+.
PlayThe 6x4 grid of Sanatorium Secrets offers 4,096 ways to win, yet no number tells you how often the bonus round arrives. That timing is not known in advance. The result of one session is random, whatever the RTP of the version you play. A stated RTP describes a long run, not the next hour.
Sanatorium Secrets has three RTP versions, and the rules of the game are the only place that names the one this site runs. Read them before the first spin, so you know which return applies to your play.
Ten symbols share the paytable, but the maximum win is a ceiling that very few spins reach. Treat the top figure as a limit on what can pay, not as a target for any session of play.
Players must be 18+. Help is available from the National Gambling Helpline on 1800 858 858, and BetStop is the national self-exclusion register.
Decide how much you can afford to lose before you open the game, and keep that amount separate from money needed for bills.
Choose the point where you stop before you start, and keep to it even after a win. A win on one spin says nothing about the next.
Set deposit and loss limits in your account before you play, so the session ends on your numbers rather than on the reels.
When the game stops being fun, pause and step away. A pause that does not help is a sign to look at self-exclusion.
Pick your next spin
Other slots this site reviews, for players who want a second game to compare.
Sanatorium Secrets, briefly
Short answers on volatility, free spins, bets, the top win and the RTP versions.
6x4 grid with 4096 ways to win, and medium volatility. Results vary in size from spin to spin, and nothing about the next round can be known in advance.
3 or more SCATTER symbols on reels 2 to 5 trigger Free Spins. The round starts with 6 spins, plus 2 for each extra SCATTER, and a Puzzle Feature plays first.
A$0.20 is the lowest bet and A$480 the highest bet allowed. A$0.50, A$1 and A$5 are the bets used as examples on this page, not the limits of the game.
x10,000 the bet is the maximum win, so the payout grows with the stake rather than being a fixed sum. Money figures for each bet appear in the figures table.
3 RTP versions share one game, and the table lists each with its return on A$100 staked. RTP is a long-run average over many spins, so it does not predict a single session.
Senior content editor and former payments compliance reviewer
I check every bonus term and wagering requirement against the cashier before a page goes live, then walk through the verification steps myself so the wording matches what you will see.
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