Book of Inferno Slot Review (Quickspin)

RTP: 96.15%

Provider: Quickspin

Best casinos: PlayFrank, Casiplay, MagicRed, Millionpot, LuckLand

Book of Inferno Key Features

RTP: 96.15%

Provider: Quickspin

Volatility: High

Theme: Fantasy

Reel style: 5x3

Paylines: 10

Stakes: £0.10 - £100

Max Win: 5,856x


Free Spins



Can the demon huntress prevent evil spirits from entering our world? The Book of Inferno slot is a demon-themed game trying to provide an answer to this thrilling question. This is another game by Quickspin where players will find exceptional graphics and intense music.

This title is played on 5 reels, equipped with standard 3 rows each, providing 10 non-adjustable paylines. Regarding the theoretical Return to Player percentage, you should expect an RTP of 96.15%. Like most Quickspin releases, this one is a high-volatility slot.

The free spins round is probably this game's most attractive bonus feature. Still, you can benefit from a few other extras with some luck. 

We invite our readers to keep reading this Book of Inferno slot review to discover the options and features of this game. Thanks to our detailed reviews at OLBG, you will be up-to-date with the best online slots available in the UK.

Casinos that offer Book of Inferno slot sorted by RTP

Up to £200 + 100 Extra Spins!

  • Wagering req. 35x
  • Value/free spin £0.10
  • Offer amount £210
Max bet limitations per spin apply. 35x wagering requirements apply (i.e the bonus x35). Higher wagering requirements may be applied depending on the games played. 18+.T&C apply, See Below.
#ad. 18+,, T&Cs Apply

100% up to £200 + 30 Free Spins

  • Wagering req. 40x
  • Value/free spin £0.10
  • Offer amount £203
New players only. 18+. Min deposit £20. 35x wagering applies to match up bonus. Offer valid for 1 week. 30 Spins on Starburst - 40x wagering applies to Spins.
#ad. 18+,, T&Cs Apply

100% Bonus up to £100 + 50 Bonus Spins on Big Bass Bonanza

  • Wagering req. 35x
  • Value/free spin £0.10
  • Offer amount £105
New players only. Min. deposit £20. Bonuses to a max of £100 + 50 bonus spins. Wagering bonus 35x. Wagering spins 35x. Winnings must be wagered within 21 days.
#ad. 18+,, T&Cs Apply

60 No-Wager Free Spins on Love Joker

  • Wagering req. 0x
  • Value/free spin £0.10
  • Offer amount 60
18+. New and Existing players. Min. deposit £15. Max bonus 60 spins on Love Joker. Spins expire after 24 hours. No wagering requirements. Promo code LOVE60. Valid until 29.02.2024. Max winnings from spins £100.
#ad. 18+,, T&Cs Apply

20 Spins No Wagering + 100% Welcome Bonus up to £100

  • Wagering req. 0x
  • Value/free spin £0.10
  • Offer amount £100
18+. Gamble Responsibly. New depositing players only. Welcome bonus: up to £100 + 20 Bonus Spins on Big Bass Bonanza. Fast payout. Eligible deposits: £20 or higher. No MAX Cash Out. Winnings won with bonus spins that require a deposit have NO WAGERING requirements. The match-up bonus that requires a deposit must be wagered 40x. T&Cs apply.
#ad. 18+,, T&Cs Apply

100 Spin Test

This 100 Spin test was updated by Steve Madgwick on 16/06/2023 

100 spins is not a Real Test

We give every slot a 100 spin test to see just what it can do, or not as the case can often be - 100 spins is no reflection of the likelihood of any other 100-spin session, as RTP's are set over many millions and probably billions of spins. So this 100 spin test is just for entertainment and insight purposes

Element Outcome
Session RTP 57.5%
Win Frequency Low
Biggest Base Game Win 3x
Spins to Bonus 4
Bonus Paid 31x
Time Taken for 100 Spins 7:18

The Spin Test criteria can be found at the bottom of the page

Test Comments

To Follow

Book of Inferno Expert Review

Theme & Symbols
Bonus Features
Max Win (5,856x)
Sounds & Music
RTP (96.15%)

Game Data

Anna, the explorer, the famous Quickspin slot character, becomes Anna, the demon hunter in this release. The Book of Inferno slot game includes a fantasy story that will keep players on the edge of their seats.

Of course, it's not just the story that will bring thrills. The same goes for the graphics, which include animated icons in distinctive colors and profound, slightly haunting music.

Undoubtedly, the base game is attractive, but the bonuses can rock your world. These include free spins and marked symbols. It's good to know that this game has multiple options and features (auto-spins, audio adjustment, video control, etc.) that players can change anytime, delivering a more personalized gaming experience.

The Book of Inferno slot review below contains more information about these things.

 Slot Review Key Features
Studio Quickspin
Theme Fantasy
RTP % 96.15%
Volatility High
Reel Style 5x3
Paylines 10
Stake Range £0.10 - £100
Max Win 5,846x
Special Symbols Marked Symbols, Wild Symbol, Scatter Symbo
Features Marked Symbol Feature, Free Spins
Jackpot None

Graphics, Music, and Sound Effects

Prepare for one of the best visuals you have seen in a slot game. This is not an exaggeration because once you load the Book of Inferno online slot, you'll notice that the creators cared for every detail.

For instance, we have a metallic/rusty-looking grid with an ornamented frame. Players will also find original icons, including multiple animated symbols in striking colors. The background image depicts a lava-ridden landscape where you can probably expect to see the entrance to hell.

Expectedly, the music of this game is dark and almost ominous-sounding. We're talking about slightly disturbing beats and heavy metal guitar riffs. You can also listen to adequate sound effects.

Key Features

Thorough slot game reviews require going far beyond the audio and visuals aspect of the release. The graphics, music, and sound section you read in our Book of Inferno slot review was just a warm-up for the more important things.

Our review will reveal some crucial features that can help you understand what you can get from this game and how to play. These include the slot's theme, stake range, reels and paylines, special features, and more.

Like always, we will continue with the theme.

Theme – Demons

It's not easy to choose just one word to describe the theme of the Book of Inferno slot because it features a more complex story than usual.

First, players will find a character that appears in several Quickspin slots. Anna, which is usually in the role of an explorer, acts as a demon hunter now. Her job is to enter the underworld and defeat the three demons before they can gather their armies and attack our world.

Experienced players know they should head to the paytable to learn about the slot's story. This time, we have a paytable with ten regular symbols: six playing card values made of metal and four characters – Commander of Hell, Lady of Hell, Lord of Hell, and Anna the Demon Huntress.

All the regular icons can be marked on any spin (Marked Symbols). Also, the Book is both a Wild and a Scatter symbol.


If it works, don't change it. That's probably the motto of the creators of the Book of Inferno slot, at least regarding the number of reels. So, you can expect 5 reels and 3 rows per reel in this game. The 5x3 gameboard is typical for modern slots.


Ten – that's the number of paylines you can expect in the Book of Inferno online slot. Players can't change this number, nor does the game alter these paylines when users activate bonus features.

The low-paying regular icons pay for three to five matching symbols on a payline. In contrast, the high-paying ones promise rewards for two to five of the same kind on a single payline.


Next on the list of the vital game feature of the Book of Inferno slot game is the theoretical payout rate, also known as RTP (Return to Player). Based on the simulation conducted by Quickspin's team, the default Book of Inferno RTP is 96.15%.

You shouldn't take this value for granted because it's just a recommended/default percentage provided by Quickspin, meaning online casinos can change it if they want to. In fact, some of them have already done this, and you can tell that by looking at the table below.

In addition to the RTPs related to Book of Inferno found in various top-rated casinos, we also provide reviews with information like description and evaluation of the game library, banking solutions, customer care, mobile-friendliness, and welcome bonuses and deals. Reading these reviews before signing up at an online casino is very helpful.

Casino RTP% Review
PlayFrank 96% Read Now
Casiplay 96% Read Now
MagicRed 96% Read Now
Millionpot 96% Read Now
Luckland 96% Read Now

Also, UK players looking for the best places to enjoy slots should visit our page featuring our recommended slot sites.

Stake Range

Regarding the game's stake range, we will mention the coins button, which reveals a selection of 16 stakes once you click on it. We like how this release enables players to play with low bets (£0.1) and high bets (£100).

Max Win

You shouldn't expect something spectacular from the max win limit of the Book of Inferno slot, but it's fair to note that this is an average value. The max payout is capped at 5,846x the player's bet.

Marked Symbols

In addition to the ordinary versions of the regular symbols, players can land their Marked versions. These Marked symbols can land on any spin randomly. When they do, if there are enough of these icons to form a winning combo (three, or in the case of high-paying regular icons - two or more symbols), the Marked icons will expand to fill the reels where they appear.

In addition, they pay anywhere on a payline. In a way, they act like Scatter symbols, but they still have to be on the same payline, not on consecutive reels starting with the first.

On the other hand, we have the Book serving as a Wild icon substituting for missing regular symbols. When a Book is part of a winning combo with Marked signs, it will upgrade that icon for a chance to get more Marked icons and expansions on the reels.

Interestingly, when a Marked icon goes over the highest symbol, the lowest-paying icon will be turned into the highest-paying one.

Free Spins

The second unique feature here is the free spins. We noted that the Book plays a dual role here and acts as a Scatter symbol. So, when players hit three, four, or five Books anywhere on the grid, they will start 10, 15, or 25 free spins, respectively.

You can win extra spins in this round by landing three to five Books, and you should expect the same number of free spins. Another great thing about this round is that one of the regular symbols will become Marked at the beginning of this special feature providing more winning chances to players.


The Book of Inferno slot has two unique features. Still, it doesn't offer a direct jackpot prize. As a reminder, we will mention that the highest reward you can win here is capped at 5,846 times your bet.

OLBG has a page with some of the best jackpot slot games for those who want to try titles like that.

Play Experience & First Impressions

Whenever you start a gaming session with a big win, you know that you can relax and unwind. That's how my 100-spin test of the Book of Inferno slot game started. Namely, after just four spins, I launched the Marked Symbols feature and won 31 times my total stake (combos with many expanded Aces).

I should mention that this feature was activated five times during the test spins. Just two of these rounds, including the one discussed above, brought something in return (the other helped me win 5 times the total stake).

Also, I was far from activating a round of free spins, although I hit two Books in a single round. Regarding the base game, the number of wins was a bit low, which is normal for high-volatility releases like the Book of Inferno online slot.

These base game wins were worth between 0.5 and 3 times by bet. When the slot summed up everything at the end of the 100-spin test, I had an RTP of 57.5%.

Finally, I will mention the audiovisuals here. The music was surprisingly refreshing, and the artwork was outstanding. This is especially true for the animated sequences featuring the book emerging from the pentagram when the Marked Symbols feature is activated.

Expert Verdict

The Book of Inferno slot has an interesting theme that leads you to the depths of hell, where the main heroine is trying to defeat the forces of evil. This release by Quickspin portrays this world well thanks to the high-quality graphics and an intriguing piece of music.

We have a game with a standard matrix featuring 5 reels and 3 rows. The 10-payline slot offers an RTP of 96.15% (57.5% after my 100-spin test). It's also a high-volatility game.

Besides free spins, which you can re-trigger anytime, users can launch Marked Symbols and get expanding and/or upgraded symbols for big wins. The max win cap of 5,846x the player's stake is also a solid feature of this slot.

Even though it might have been better if the Book of Inferno had a few more bonuses, I appreciate the unique audiovisual elements and the original story of this game. The same goes for the standard features, which is why I recommend this title.

Editorial Information

The Book of Inferno slot review was written by the OLBG Slots Content Team, beginning with Andrej Trajkovski, who has worked in the online gambling industry since 2013, playing and reviewing online slots and casinos daily for the past four years. 

Contributing to the review was Jake Ashton, a slots fan who is also part of the casino and sports betting team here at OLBG and Jenny Mason with Online Casino, Bingo and Slots Experience from over 15 years in the industry. 

The review is Fact Checked by William Westerlund, an online casino expert reviewing casinos and slots for over five years, and published by Steve Madgwick, our Editor-In-Chief with over 18 years of experience creating and managing high-quality sports betting and Casino content for OLBG & multiple other publications and a self-confessed online slots fans who has played at 100's of the best slot sites online and completes the Spin tests.

100 Spin Test Criteria

The 100 Spins test is undertaken on a demo slot, staking 100 spins at £1 per spin

Session RTP - Return to the player after 100 spins - Eg, A return of £45 from 100 spins is 45%, or a return of £107 is 107%

Win Frequency - A winning spins to spins frequency, higher frequency regardless of prize, is often more entertaining.

  • 0-10 Very Low
  • 11-15 Low
  • 16-30 Medium
  • 21-35 High
  • 36+ Very High

Biggest Base Game Win  - Highest single base game spin winning value

Spins to Bonus - How many spins were completed before the main bonus round was achieved

Bonus Paid - Value of bonus once complete

Time Taken  - How long did the 100 spins take to complete?


Book of Inferno Slot FAQs

  • Is there a Book of Inferno mobile slot?

    As a modern casino game, the Book of Inferno slot is available to computer and mobile users. You should have a smooth gaming experience as long as you have a relatively modern phone or tablet.

  • When was the Book of Inferno slot released?

    Quickspin launched the Book of Inferno slot on 7 February 2023. The game became available to players worldwide (the United Kingdom included) on that day.

  • How does the free spins feature of the Book of Inferno slot work?

    The only way to activate a round of free spins in the Book of Inferno slot is to wait to spin in at least three Scatter (Book) icons anywhere in view. You can win between 10 and 25 free spins based on the number of triggering Scatters. All free spins are played automatically.

  • What is the Book of Inferno slot max win?

    You can win up to 5,846 times your current bet in a single spin in the Book of Inferno online slot.

  • How is the volatility of the Book of Inferno slot?

    We have another high volatility slot from Quickspin here. Theoretically, the Book of Inferno slot pays high wins. Still, it does this less frequently than medium or low-volatility slots.

  • Where can I play the Book of Inferno online slot for real money?

    If you are interested in playing the Book of Inferno online slot for real money, you should know that dozens of online casinos in the UK offer this title. We have highlighted the best options on our website.  

By using this site you confirm you are 18+ and consent to our use of cookies and processing of personal data as set out in our Privacy Policy
Got it!