The Sanatorium Secrets bonus buy lets you pay a fixed multiple of your stake to drop straight into the free spins round, instead of waiting for the scatters to line up organically. On the standard tier that price is the familiar Pragmatic Play 100× total bet. For the full mechanics, theme and stat sheet on this 2026 release, start with the main Sanatorium Secrets review.
Check one thing before you reach for the buy button. The feature is switched off in the UK, Germany and Sweden, where regulators ban purchasable bonuses outright. This page breaks down what each tier costs, walks through the in-game purchase flow, and reasons honestly about whether paying upfront is +EV or just a faster way to drain a bankroll.
The Sanatorium Secrets bonus buy runs on Pragmatic Play's standard purchasable-feature framework, so the headline cost will look familiar to anyone who buys features regularly. The slot ships with two pricing routes to the free spins round, plus an ante-style bet that nudges your organic trigger rate without locking you into the round.
One caveat up top. Buying the feature is region-gated. Players loading the game inside UK, German or Swedish licences won't see a buy button at all, because those regulators prohibit purchasable bonuses. Everywhere else the menu sits one tap away from the reels.
The base Sanatorium Secrets buy bonus is priced at 100× your total bet. Stake €1 a spin and the buy costs €100; stake the €0.20 minimum and it drops to €20. That multiple buys you the same free spins feature you'd trigger by landing the scatters, with no shortcut to a bigger multiplier ceiling.
Across the bonus buy, Sanatorium Secrets hands you the free spins round complete with its expanding symbols, random multipliers and wilds-with-multipliers carrying over between drops. The Super Free Spins tier, where active, costs more (roughly 400× on comparable Pragmatic titles) and seeds the round with stronger multiplier potential from the first spin.
The Bonus Bet is not a Sanatorium Secrets slot bonus buy in the strict sense. It raises your stake by about 25% and improves your odds of triggering the feature naturally, spreading the cost across many spins rather than charging it all at once. It suits players who want feature frequency without dumping 100× in a single click. Note that Pragmatic rarely publishes a per-tier RTP figure for these buys, so treat any quoted buy-feature return as an estimate rather than a confirmed number.
The Sanatorium Secrets buy free spins option sits in a dedicated menu reached from the reel interface, and the flow is short. You set your stake first, because the buy price scales off it, then confirm the purchase and the free spins round loads immediately.
Open the game in real-money mode at a casino that offers the feature. Set your line bet using the stake controls, since the 100× cost is calculated from whatever total bet is showing. Tap the buy-feature icon (usually a separate button to the side of the spin control), pick the tier you want, and review the cash cost the menu displays before you commit.
The debit is immediate and irreversible, so double-check the cash figure rather than the multiplier. At €5 a spin the buy is €500, and that money is gone the moment you confirm, win or lose. Set a hard ceiling on how many buys a session can absorb before you start.
If your account is in a market where the buy is blocked, or you just want to rehearse the flow, the same menu is available in demo mode with play credits. The buttons, tiers and confirmation screen behave identically, so you can learn the UI without risking a cent. There are no winning guarantees here either; the demo uses the same RNG behaviour as the cash game.
Here's the uncomfortable part of any bonus buy: you're paying for convenience, not edge. A purchasable feature is a payment for a shortcut, and the expected return on that shortcut sits at best at break-even, usually a touch below. Sanatorium Secrets is no exception.
Work the rough math. On a medium-volatility Pragmatic ways title, the free spins round triggers organically somewhere around once every 200 to 250 spins. The standard buy charges 100× the bet, which is the equivalent of 100 base spins of stake, to skip that wait. Because the free spins contribution feeds the same overall 96.47% return, the long-run yield on thousands of buys converges toward, and slightly under, the figure you'd hit by spinning normally. You don't unlock a higher ceiling; you just front-load the variance.
The gap between base-game and feature return is laid out in full in the Sanatorium Secrets RTP breakdown, which is worth reading before you decide the buy is somehow a better bet than the reels. It isn't a better bet - it's a faster, more concentrated one.
The honest way to gauge whether the Sanatorium Secrets bonus buy free play behaves the way you expect is volume. A handful of buys tells you nothing; the multiplier distribution is heavy-tailed, so most rounds return below the buy cost while a rare few carry the average. The advertised cap of 10,000× is real but extraordinarily rare, and the documented top results are catalogued on the Sanatorium Secrets huge payouts page rather than guaranteed by any purchase.
There is no genuinely free bonus buy in cash play. Any Sanatorium Secrets free bonus buy you encounter is either demo credits or a casino promotion crediting the cost, in which case the wagering terms decide whether it carries value. Read those terms; a buy funded by a bonus with a high wagering ratio rarely clears in your favour.
Before you commit real funds, load the Sanatorium Secrets bonus buy demo and run the feature a few dozen times. The free version replicates the exact buy menu, the tier pricing in play credits and the free spins behaviour, so you get an honest feel for how often the round pays back the price and how often it underwhelms.
You can launch the Sanatorium Secrets demo instantly in your browser, no account or deposit needed. Use it to answer the questions that actually matter before real money is on the line.
Buying repeatedly in demo shows you the shape of the variance: how the expanding symbols and carried-over multipliers chain together, how many buys go nowhere, and what a strong round looks like when the random multipliers stack. None of this guarantees anything in cash play, but it stops the first real buy being a blind one. Track your demo results over 30 or 40 buys, not five.
The Sanatorium Secrets slot demo bonus buy is also the safe option for players in blocked markets who simply want to see the feature. Since the buy is unavailable in UK, German and Swedish real-money builds, the demo is the only legitimate way to experience it from those regions. Keep a session limit in mind even in free play, because the habit of clicking buy carries over to the cash game faster than most players expect.
The standard buy is priced at 100× your total bet, so it scales with your stake. At the €0.20 minimum that's €20; at €5 a spin it's €500. A higher Super Free Spins tier, where offered, costs more for stronger multiplier potential.
No. The buy feature is disabled in the UK, Germany and Sweden because those regulators ban purchasable bonuses. Players in those markets won't see a buy button in the real-money game and can only view the feature in demo mode.
Pragmatic Play does not publish a separate per-tier RTP for the buy. In practice the feature feeds the same 96.47% overall return, so buying converges toward break-even at best and slightly below over the long run. It's a shortcut, not an edge.
Only in demo mode, where you buy the feature with play credits. There is no free buy in cash play; any 'free' buy you see is either the demo or a casino promotion whose wagering terms decide its real value.
No. The 10,000× max win is a theoretical cap that almost never lands, and most bought rounds return less than the buy cost. The multiplier distribution is heavy-tailed, so a few rare rounds carry the average while most fall short.
The Bonus Bet raises your stake by about 25% and improves your organic trigger odds across many spins. The bonus buy charges a fixed 100× upfront to enter the round immediately. One spreads cost, the other concentrates it.
