Book of Inferno
Book of Inferno
Play Book of Inferno the way its meant to
Help Anna the Explorer fight the demons and safe the world!

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Book of Inferno

It’s just another day in the life of Anna the Explorer, where a trio of demons have started crossing over into our realm to take over our world and end life as we know it forever. No biggie.

Equipped with a powerful armour and lots of Red Bull, Anna heads into the abyss of darkness while channelling her inner demon huntress. Guided by the Book of Inferno to track down her targets, she’s taking on her most intimidating enemies so far: The Lord of Hell, The Lady of Hell, and the Commander of Hell.

But there are even greater dangers lurking inside the fires of hell. Will Anna be able to outsmart the twisted logic of the Inferno?

Book of Inferno is a classic 10-line Book-game with high volatility and a high max win, boasting Expanding Pay Anywhere Symbols, a Free Spins Bonus with permanent Expanding Symbols, a Buy feature (pay to get instant entry to the bonus game), plus a unique Upgrade Expanding Symbols feature that can turn any spin into an Epic Win!

Game Information

Min bet
Max bet
RTP's available
96.15% / 94.19% / 87.16%
Release date
February 7th 2023
Our rating

Book of Inferno Media

Game Features


Book of Inferno is a 10-line game with Expanding Pay Anywhere Symbols. A symbol is Marked to expand and pay anywhere. Any Book landing will upgrade the Marked symbol one step. A symbol is always Marked at the start of the Free Spins Bonus. A symbol can become Marked at random in any spin in the base game.


Book symbols are Wilds and substitute for all other symbols.

Marked Symbol

Anytime a Marked symbol lands on the reels, if there are enough of them to pay: the Marked symbols will be expanded to cover their entire reel and pay anywhere on a line, without the need to be in sequence from left to right in an extra win evaluation.

Any Book symbol that lands together with a Marked symbol will upgrade the Marked symbol one step, potentially creating more Marked symbols and expansions.

If a Marked symbol is upgraded past the highest symbol, the lowest symbol will be converted into the highest.

Free Spins Bonus

  • 3 Books award 10 Free Spins
  • 4 Books award 15 Free Spins
  • 5 Books award 25 Free Spins

Books award the same amount of extra free spins when re-triggered inside the Free Spins Bonus. At the start of the Free Spins Bonus, a random symbol will be selected as Marked.

Buy Feature

You can buy instant entry into the Free Spins Bonus. By paying 125x bet, the feature will trigger with 3 or more Books with the same frequency as when triggered by chance.

Review of Book of Inferno

Book of Inferno is a Quickspin online slot that immerses players in a fiery underworld filled with demonic beasts, lava pools, and scary sculptures. This 5-reel, 10-payline game is highly volatile, offering an alternative RTP model, and is available on any device for bets starting at 10 p/c per spin, up to £/€100. The game features ten pay symbols, four high-pay characters, including Anna the Demon Huntress, and a book symbol that acts as a wild and scatter symbol. The book can create wins of up to 500x the bet for a line of five.

The game follows the standard 'Book of' MO, where expanding, pay anywhere, all lines special symbols appear in free spins. However, it also uses the concept in the base game with Marked symbol upgrades. Whenever a Marked symbol lands, it expands to cover the entire reel and pays anywhere on all paylines, without needing to be adjacent. If a book lands at the same time as a Marked symbol, the Marked symbol upgrades to the next highest value symbol, creating more Marked symbols and expansion. Free spins are triggered by landing 3, 4, or 5 books, awarding 10, 15, or 20 free spins with up to 200x the bet win on top.

The game has exceptional graphics, and the audio team has done an excellent job adding an additional layer of depth, heaviness, and horror to the sounds. The smaller details, such as book animations when features trigger, have been skillfully executed. The game feels like Quickspin pushed the 'Book of' concept to the next level, making a bold statement with the visuals and setting. The heroine, Anna the Demon Huntress, adds to the experience, making players feel less alone in the fiery abyss. The game is highly volatile, and although the RTP model can vary, the highest RTP value is 96.15%, increasing to 96.65% when buying free spins.

Despite the exceptional graphics and audio, and the use of the 'Book of' concept, Book of Inferno feels like just another 'Book of' slot. The game lacks any significant changes to the gameplay mechanics that distinguish it from other games in the genre. The game follows the standard formula and does not offer any new exciting features that could make it stand out. Additionally, the game is highly volatile, which means that players may need to play many spins to achieve a significant win.

In conclusion, Book of Inferno is an excellent addition to the 'Book of' genre of online slots, with striking visuals and audio. The game is highly volatile, and although the RTP model varies, the highest RTP value is 96.15%, increasing to 96.65% when buying free spins. While the game lacks any significant changes to the gameplay mechanics, it is a solid game with the potential for significant wins. Overall, Book of Inferno is a well-designed game that is worth playing, earning a 4 out of 5 rating.

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