Book of the Priestess Bonus Buy

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Book of the Priestess Bonus Buy

Bonus buyFree spinsBitcoin Slots

RTP95.96%

VolatilityMedium–high

Max winx6,088

Lines10

Hit rate35%

ThemeBook of…

ReleasedMar 2023

Provably Fair
Instant Crypto Payouts
Thousands of Games

Written bySophieUpdated October 8, 2026

Temple Books and Priestess Free Spins

Book of the Priestess Bonus Buy slot drops a jungle-temple Book mechanic beside an 87x feature buy, while my measured run stayed in the base game.

Book of the Priestess Bonus Buy slot is a medium-high volatility slot from Evoplay with 95.96% RTP and 6,088x max win potential. The game uses a 5 reel, 3 row grid with 10 fixed paylines, Book Wilds and Expanding symbols in free spins. Bonus hunters get the clearest value here when they can handle dry base-game stretches.

Key takeaways

Best bonus: The Bonus Buy gives direct access to 10 free spins for 87x the total bet, but my measured test stayed in the base game.
RTP / volatility: Official RTP is 95.96% with medium-high volatility, so you should expect uneven pacing and dry spells.
Max win: Official maximum win is 6,088x the bet, which feels respectable rather than extreme.
Risk note: My 100-spin run lost 62.5x the bet and never triggered free spins.
Bankroll note: The test balance was 500x the bet, so real stakes need room for dead spins or one careful feature-buy test.

Fast Fact: The Book symbol works as both Scatter and Wild, but it doesn’t substitute for the Expanding symbol during free spins.

Table of Contents

Book of the Priestess Bonus Buy slot theme & first impressions
Game info and setup
Symbols, pays and line wins
Premium symbol pays
Low symbol pays
How Book of the Priestess Bonus Buy works
Book as Wild
Scatter pays
Free spins feature
Trigger and setup
Expanding symbol rules
Ancient Mask counter
Counter countdown
Extra symbols
Bonus Buy cost and value
Buy price
Test choice
How the 100-spin test played
Session setup
Best spin
RTP, volatility and test data
Simulator projection
Our 100-spin session
Frequently Asked Questions About Book of the Priestess Bonus Buy
Closing Thoughts

Book of the Priestess Bonus Buy slot theme & first impressions

Book of the Priestess Bonus Buy slot looks like a clean jungle-temple Book slot, with a readable board and a feature symbol you can spot fast. The reels sit between carved stone pillars, orange glyph panels and four framed priestess portraits.

You’ll notice the red Book with a green gem quickly, which matters because it drives the whole game. The low symbols use carved stone letters and numbers, so the premium portraits stay easy to read. The theme won’t win originality awards if you know temple Book games, but the layout works well.

Book of the Priestess Bonus Buy online is playable on SatoshiHero in demo and real modes. My demo opened at a $10.00 bet with a $5,000.00 DEMO balance, equal to 500x the bet. I like that the Bonus Buy tab stays visible without crowding the 5×3 board.

5x3 temple board settled at 10.00 bet — The board waits with 5,000.00 DEMO showing.

If you know Book of the Priestess, this version feels familiar in setting and symbol style, but the feature-buy layer changes the pacing. You can chase the same temple mood while deciding whether instant free spins deserve the extra bankroll hit. That choice gives this version a sharper edge.

The artwork stays practical rather than lavish. You get bright portraits, clear stone symbols and a board that doesn’t hide key information. Screenshots and test notes are checked regularly when the game setup changes.

Game info and setup

Book of the Priestess Bonus Buy uses a compact 5×3 setup with 10 fixed paylines, 95.96% RTP and medium-high volatility. Evoplay built it as a traditional slot, so you’re dealing with reels, rows, line wins and a Book-style bonus engine.

Here are the core facts you need before you spin:

Developer: Evoplay
Game type: Slots
Grid: 5 reels and 3 rows
Paylines: 10 fixed paylines
RTP: 95.96%
Volatility: medium-high
Maximum win: 6,088x the bet
Bonus Buy: 87x the total bet

I opened the demo at a $10.00 bet with a $5,000.00 DEMO balance. That gave me 500x the bet, which felt like enough to observe the base game without one short cold patch ending the session too quickly.

Demo amounts in this guide are easier to compare when you read them as bet multiples. A $40.00 hit at a $10.00 stake becomes 4x, while the final $625.00 drop becomes 62.5x. That framing helps you scale the same rhythm to your own stake size.

You might find the setup simple, but simple doesn’t mean soft. Medium-high volatility can still bite when the Books stay apart. I’d treat the base game as a patience test, not a steady drip-feed machine.

Symbols, pays and line wins

Book of the Priestess Bonus Buy slot is a traditional 10-line slot where the biggest line value sits on the Blue Priestess, not the low stone symbols. Wins pay left to right from the leftmost reel, and only the highest win per line gets paid.

The game pays in multiples of the total bet. That matters because the symbol table can look huge until you connect it to line alignment. You still need matching symbols on fixed paylines, so premium symbols matter most when they actually line up.

Goddess Of the Night Bonus Buy also leans on portrait-led presentation, but this slot feels more like a classic temple Book game. If you prefer clean symbol tiers over moodier fantasy styling, this one reads faster during turbo spins.

Premium symbol pays

The Blue Priestess is the top symbol. She pays 500x for five of a kind, 100x for four, 10x for three and 1x for two. That 500x top line sounds punchy, but fixed paylines make position just as important as symbol value.

Four priestess portraits show top payout values — The portrait table shows its highest line values.

The Purple Priestess pays 200x, 40x, 4x and 0.5x for five, four, three and two. The Red Priestess and Green Priestess each pay 75x for five, 10x for four, 3x for three and 0.5x for two. You’ll want portraits, but you won’t see their best side without tidy left-to-right structure.

Low symbol pays

The A and K pay 15x for five, 4x for four and 0.5x for three. The Q, J and 10 pay 10x for five, 2.5x for four and 0.5x for three. Those low symbols won’t thrill you, but they kept my short base-game run moving.

Stone letter symbols display lower payout values — The stone letters sit below the portraits.

My best observed win involved three Ks and the Book acting as Wild. It paid $40.00 at my $10.00 bet, which equals 4x. That hit wasn’t glamorous, yet it showed why the Book still matters when free spins don’t arrive.

40.00 win appears with three Ks — The 40.00 line win holds on screen.

How Book of the Priestess Bonus Buy works

Book of the Priestess Bonus Buy runs through the Book symbol, because it acts as Scatter, Wild and the trigger for the main feature. The evoplay book of the priestess bonus buy mechanic set feels familiar, but the 87x buy adds a direct route to the free spins.

The Book pays anywhere on the reels. It pays 2x for three, 20x for four and 200x for five. It also substitutes for every other symbol except the Expanding symbol during free spins.

You’ll notice two layers at work during base play. Regular symbols need line alignment, while Book Scatters can pay anywhere. That mix gives ordinary spins a little more tension than the plain symbol table suggests.

Tip: Don’t treat every Book landing as progress in the base game. You still need three or more Books together to start free spins unless you use the Bonus Buy.

Book as Wild

The Book can complete ordinary line wins when it lands in the right place. My clearest example came from three Ks plus the Book, which paid $40.00 at a $10.00 bet. That 4x hit was my best observed spin, even without any bonus round.

Wild value matters here because the free spins can stay out of reach. In my 100-spin test, no three-Book trigger landed at all. The Book still helped the session, but it didn’t rescue the balance.

The game plays in browser on desktop and mobile layouts at SatoshiHero. I wouldn’t call that a feature worth its own section, but the interface stayed clear enough for turbo autoplay and manual checks.

Scatter pays

Scatter pays don’t need paylines, which makes the Book easier to track than the portraits. Three Books pay 2x, four pay 20x and five pay 200x the bet. Those values can land anywhere on the reels.

Still, a single Book doesn’t move a visible base-game meter. That’s important because the Ancient Mask only wakes up inside free spins. You need the trigger first, and my test never got it.

Free spins feature

Free spins start when three or more Books land anywhere, then one regular symbol becomes the Expanding symbol for 10 spins. The feature uses the same bet as the triggering spin, so your stake choice before the trigger matters.

Book symbol and feature art panels displayed — The feature symbols sit together on the table.

Before the round begins, the game picks one regular symbol at random. That symbol stays displayed above the reels for the whole round. You’ll want to watch that symbol closely, because it shapes most of the bonus potential.

When enough Expanding symbols land to form a win, they expand to cover the full reel. Normal line wins count first, then the expanding wins pay. That order gives the feature its classic Book-slot rhythm.

Trigger and setup

Three or more Book Scatters anywhere trigger the 10 free spins. The trigger doesn’t depend on paylines, which helps the Book feel more exciting than a normal Wild. You still need three of them together, and that didn’t happen during my 100-spin run.

One regular symbol becomes the Expanding symbol at random. A premium portrait can make the round feel loaded, while a low symbol may still create repeat wins. I couldn’t measure the feature live, so this section explains paytable-tested rules rather than a played bonus result.

Expanding symbol rules

Expanding symbols can form wins even when they sit on reels that aren’t adjacent. That detail gives the bonus more reach than a strict line-only feature. If two or more qualifying symbols land together, they expand and pay one after another.

The Book doesn’t substitute for the Expanding symbol. I like that rule because it keeps the bonus from feeling too automatic, though it can sting when Books land beside your chosen symbol. You’ll need real symbol hits, not just Wild support.

Ancient Mask counter

The Ancient Mask counter only works inside free spins, where Book Scatters count down from 7 toward extra spins and another Expanding symbol. It doesn’t run in the base game, so my measured session never activated it.

Every Book Scatter that lands during the round charges the counter by 1. The counter counts down from 7 to 0. When it reaches 0, it awards one more Expanding symbol and adds 5 extra free spins after that spin’s wins pay.

Curse of the Pharaoh Bonus Buy uses a similar ancient-artifact pull, but this slot ties the tension to extra expanding symbols. The mask feels less like decoration and more like the bonus round’s ceiling builder.

Trivia: A bonus round can theoretically hold up to 9 Expanding symbols if the Ancient Mask keeps resetting.

Counter countdown

The countdown starts at 7 inside free spins. Each Book reduces it by one step, then the mask resets after reaching 0. You’ll need Books during the feature, not just in the base game, to see that extra layer.

This rule makes Book landings feel different once the bonus starts. In the base game, they trigger or pay. In the bonus, they can extend the round and widen the symbol pool.

Extra symbols

Another Expanding symbol matters because it adds one more regular symbol type to the feature’s winning potential. More chosen symbols mean more chances for reel-wide expansions. That’s where the top-end 6,088x result starts to make sense.

A round can hold up to 9 Expanding symbols at once. That ceiling sounds exciting, but it needs repeated Book Scatters after the initial trigger. I like the idea, yet my base-game test showed how far away the setup can feel.

Bonus Buy cost and value

The Bonus Buy costs 87x the total bet, so it gives instant access to 10 free spins but takes a serious slice of bankroll. The button sits to the left of the board, and the purchase opens through a confirmation popup.

At my $10.00 bet, one buy would have cost $870.00. That equals 87x the bet and 17.4% of my $5,000.00 DEMO balance. You don’t need much imagination to see how repeated buys can change the whole session.

The Belt of Champion Bonus Buy also appeals to direct-feature players, but this slot’s 87x price links bankroll pressure to a classic Book bonus. You’re paying for access, not a measured edge from my session. I didn’t buy the feature, so I won’t pretend I tested its return.

Buy price

The 87x cost scales with your stake. A $1.00 bet means an $87.00 buy, while a $10.00 bet means an $870.00 buy. That scaling can feel harsh if you leave your base-game stake unchanged.

You might like the clean access if you hate waiting for Scatters. I’d still lower stake size before testing buys, because one purchase can equal many normal spins. The convenience comes with real exposure.

Alert: At 87x your bet, repeated buys can drain a balance quickly. If you use the feature buy, reduce stake size before testing it.

Test choice

My measured run stayed in the base game. I used autoplay with turbo on and avoided the buy, so the results show base-game pacing rather than paid bonus access. That choice made the dry spell easy to see.

I don’t mind that outcome because it tells you something useful. Without the buy, you can spin 100 times and still miss the feature entirely. That’s the most honest warning this session gave me.

How the 100-spin test played

My 100-spin base-game test ended 62.5x down, with 35 paying spins and no free spins trigger. I started with $5,000.00 DEMO at a $10.00 default bet and finished at $4,375.00 DEMO.

I ran autoplay with turbo on for the measured 100 spins. The balance never climbed above the starting point. It slid down in small steps, which felt more draining than dramatic.

This was a short losing sample, not a verdict on the math. Still, it showed the main weakness clearly. When three Books don’t connect, the base game can feel thin.

Session setup

The 500x starting balance gave the slot room to breathe. At $10.00 per spin, 100 spins used 20% of the starting balance in wagered amount. The final loss landed at $625.00, equal to 62.5x the bet.

A 35% hit rate sounds active, but many pays were small. That’s why the balance kept sliding despite frequent minor returns. You’ll notice this pattern fast if you expect regular recovery hits.

No three-Book trigger appeared in the measured run. That meant no free spins, no Expanding symbol and no Ancient Mask counter during the test. I took the win frame from a few extra manual spins after the run.

Best spin

My best single spin paid $40.00, or 4x the bet. It came from three Ks and the Book helping as Wild. That hit matched the mechanics section neatly, even if it didn’t change the session.

I liked seeing the Book produce value outside the bonus. I didn’t like how little that value mattered over the full 100 spins. The result left the base game feeling functional, not generous.

Book of the Priestess Bonus Buy slot needs its feature to show personality. Without free spins, you mostly watch small line wins and wait for Books. That can feel fine in demo mode, but real-play stakes demand restraint.

RTP, volatility and test data

Book of the Priestess Bonus Buy has 95.96% theoretical RTP, medium-high volatility and a 6,088x maximum win, so the feature round carries most of the upside. You play mostly for the free-spins engine, not steady base-game returns.

Medium-high volatility means uneven pacing rather than constant big hits. The 6,088x cap feels respectable, but it isn’t huge enough to make base-game droughts painless. In my test, the slot showed its colder side quickly.

Simulator projection

Our simulator modelled 1,000 spins at one bet unit from 95.96% RTP, the 6,088x cap and the medium-high volatility band. The median session finished 52.4x down. That lines up with the idea that many sessions can feel negative before a strong feature appears.

Blue 1000-spin projection line crosses the graph — The blue model line swings across 1,000 spins.

The middle 90% of runs landed between 258.4x down and 232.7x up. Roughly 21% of spins paid something, a feature-sized win showed about once in 45 spins, and a very large win showed about once in 4,032 spins. That’s a projection range, not a prediction for your next session.

I find those numbers useful because they explain the cold base-game feel. A 21% modelled hit rate sounds lower than my measured sample, yet the simulator still points to swingy outcomes. More paid spins don’t automatically mean a better balance.

Our 100-spin session

My 100-spin session ended 62.5x down. 35 of my 100 spins paid something, so the measured hit rate was 35% in that small sample. No feature triggered, and the best spin reached only 4x.

Gold 100-spin balance line ends at 4375.00 — The gold test line drifts down to 4,375.00.

That contrast matters. The simulator suggested lower hit frequency, while my test paid more often but still lost. Small hits can keep the screen busy without protecting the bankroll.

The slot’s volatility showed up as slow bleed rather than sudden collapse. I prefer that to wild empty stretches, but it still leaves you waiting for the bonus. If you don’t see the feature, the base game doesn’t offer much drama.

Theoretical RTP is the operator’s published return figure. One live or demo session has no bearing on that figure, and bonus-buy and base-game returns can sit slightly differently by design. The SatoshiHero Slot Simulator is an illustrative model based on official RTP, volatility band and maximum win, not a promise of results.

Frequently Asked Questions About Book of the Priestess Bonus Buy

What is Book of the Priestess Bonus Buy slot?

Book of the Priestess Bonus Buy slot is a 5 reel, 3 row, 10 fixed payline slot from Evoplay. It has four priestess portraits as high symbols, a Book that acts as Scatter and Wild, free spins with an Expanding symbol and an Ancient Mask counter.

How do free spins work in Book of the Priestess Bonus Buy slot?

Three or more Book Scatters trigger 10 free spins. One regular symbol becomes the Expanding symbol for the round, and it expands to cover a full reel when it forms a win, even across reels that aren’t adjacent.

What does the Book do in Book of the Priestess Bonus Buy slot?

The Book works as Scatter and Wild at the same time. It substitutes for every symbol except the Expanding symbol, pays anywhere, and pays 2x, 20x and 200x the bet for three, four and five.

How does the Ancient Mask work in Book of the Priestess Bonus Buy slot?

The Ancient Mask only runs in free spins. Each Book that lands charges a counter from 7 down to 0, then it adds another Expanding symbol and 5 free spins before resetting to 7.

Can you buy the bonus in Book of the Priestess Bonus Buy slot?

Yes, the Bonus Buy button sits on the left of the board and buys 10 free spins for 87x the total bet. I didn’t use it in this test.

What did the 1000 spin simulator show for Book of the Priestess Bonus Buy slot?

At one bet unit, the median 1,000-spin session ended 52.4x down. The middle 90% of runs landed between 258.4x down and 232.7x up.

How did your 100-spin test go?

I finished 62.5x my bet down. 35 of 100 spins paid something, the best spin paid 4x, and no free spins triggered.

What are the RTP and max win of Book of the Priestess Bonus Buy slot?

The RTP is 95.96%, the volatility is medium-high and the maximum win is 6,088x the bet. The game also uses 10 fixed paylines.

Closing Thoughts

Book of the Priestess Bonus Buy gives classic Book-slot tension with a clear 87x shortcut into free spins. Its main drawback is the dry base game, because my test never saw three Books connect.

My Verdict

Patient bonus hunters and feature-buy fans get the strongest case here, especially if they value a clear Book mechanic over constant base-game action. Expect small wins, cold patches and a bonus round that may take time unless you buy it. I’d play it with a reduced stake before touching the 87x option.

I like the clean symbol design, readable paytable and simple feature structure. I don’t like how my 100-spin run slid down without ever showing the Expanding symbol or Ancient Mask. The best hit was only 4x, so the measured session felt honest but cold.

Classic temple Book fans should notice Book of the Priestess Bonus Buy slot for its fixed paylines and paid access to free spins. My notes stay updated periodically, and the core lesson remains simple: respect the 87x buy cost before you chase the feature.

Pros:

Clear Book mechanic: Scatter and Wild roles make the key symbol easy to track.
Strong feature ceiling: Ancient Mask upgrades can add symbols and extend free spins.
Readable layout: The 5×3 board stays clean during turbo play.
Direct bonus access: The 87x buy skips long waits for three Books.

Cons:

Dry base game: My 100-spin run never triggered free spins.
Costly buy: One feature purchase used 17.4% of my demo balance.
Modest test peak: My best observed win reached only 4x.

Best For: Classic Book-slot fans, patient bankroll managers and bonus-buy testers get the most value from this game. If you want fast base-game excitement, the dry stretches may frustrate you. If you like waiting for a feature that can grow through extra symbols, the structure makes sense.

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