Book of Inferno (Quickspin) Slot Review

Book of Inferno: Slot Overview 

Drawing inspiration from Dante Alighieri’s Divine Comedy, Quickspin’s Book of Inferno plunges players into the darkest corners of the underworld. Released on February 7, 2023, this high volatility online slot takes the familiar “Book of” formula and injects it with searing flames, demonic lore, and inventive features that elevate it beyond a traditional clone. 

This 5-reel, 3-row game with 10 paylines doesn’t shy away from its infernal theme. It takes a bold stance visually and aurally, backed by an impressive RTP of 96.15% (which increases to 96.65% with the buy feature), and offers a max win potential of 5,846x the bet. At its core, Book of Inferno retains the signature expanding symbol mechanics known to fans of the genre but introduces the Marked Symbols system and upgrade mechanics, adding a fresh twist to an established format.

Design and Graphics 

Quickspin’s artistic direction in Book of Inferno is unapologetically intense. The reels are framed in a hellish red landscape, with gothic structures, lava rivers, and sinister sculptures lurking in the background. Flickering flames and demonic runes enhance the visual immersion, establishing a strong visual identity from the outset.Character design is another standout. The high-paying symbols feature richly detailed figures like the Commander of Hell, Lord and Lady of Hell, and the striking Anna the Demon Huntress—a heroine who exudes power and mystique. Even the lower-tier A–9 symbols are designed with a sharp, jagged, infernal flair, reinforcing the theme consistently across the board. 

Each symbol upgrade, book trigger, or Marked Symbol transformation is animated with cinematic polish, amplifying tension and excitement. The visual storytelling, from base game to bonus rounds, remains faithful to its underworld motif and never lets up in intensity.

Gameplay Mechanics 

At its foundation, Book of Inferno is a 5×3 grid slot with 10 fixed paylines. Wins are formed by matching 3 to 5 symbols from left to right, with high-paying symbols awarding significant returns—up to 500x the bet for a full line of premium characters. The Book symbol serves a dual role as both wild and scatter, triggering free spins and substituting for all regular symbols. 

However, what differentiates this title is the Marked Symbol mechanic. Marked Symbols can land in both the base game and the free spins. If enough of them appear to create a win, they expand to cover entire reels, paying on all lines regardless of position. This alone is a major evolution of the classic “Book of” formula. 

In addition, when a Book symbol lands simultaneously with a Marked Symbol, that Marked Symbol is upgraded to the next higher-tier symbol. This adds a strategic layer of potential, especially when upgrades lead to high-paying symbols like the Demon Huntress. Should the upgrade process go beyond the highest-tier symbol, the lowest pay symbols are converted into the highest ones, maximizing reward potential.

Sound and Music 

Sonically, Book of Inferno is a triumph. From the first spin, you’re greeted with a brooding, cinematic soundtrack that incorporates growling strings, demonic chants, and ominous bass. It channels the tension and weight of the netherworld without crossing into cliché or overwhelming the experience. 

The use of dynamic audio—which escalates during special events like book triggers or major wins—adds an adrenaline spike at the right moments. Sound effects such as page flips, fire crackles, and deep rumbles complement the visual flourishes of Marked Symbol expansions or symbol upgrades. 

The attention to auditory detail strengthens the game’s atmosphere, delivering an immersive audio-visual package that perfectly matches its infernal theme.

Bonus Features 

Book of Inferno packs several high-impact features that make the gameplay both familiar and exciting:Marked Symbols 

These special symbols appear in both the base game and bonus rounds. When a sufficient number lands to form a win, they expand across entire reels, ignoring standard payline rules and paying anywhere. If a Book lands at the same time, the Marked Symbol is upgraded—possibly triggering further expansions and conversions. This compounding mechanic can result in explosive payouts. 

Free Spins 

Landing 3, 4, or 5 Book symbols awards 10, 15, or 20 free spins, respectively. Players also receive a multiplier prize of x2, x20, or x200 their bet depending on the number of triggering Books. 

Before the bonus round begins, the Book flips open to randomly select one pay symbol to become the Marked Symbol for the entire round. The potential for upgrades, expansions, and high-payout combinations is at its peak during these spins, especially when the chosen Marked Symbol is a premium character. 

Buy FeaturePlayers in eligible markets can purchase direct access to the bonus round for 125x the bet, which guarantees free spins with 3 or more Books. Using this option boosts the RTP to 96.65%, providing a more efficient route for bonus seekers. 

This feature is particularly useful for those who want to bypass base game variance and dive straight into the action, capitalizing on the game’s most lucrative segment.

Betting Options and Payouts 

Book of Inferno accommodates a wide range of players, with a minimum bet of €0.10 and a maximum of €100 per spin. This accessibility, paired with its volatility, allows both casual players and high-rollers to tailor their risk level. 

Payouts follow a traditional model: 

Premium character symbols pay 8x to 12x for five of a kind. 

The Book symbol pays up to 500x the bet when five land on a line. 

Marked Symbol expansions can transcend these fixed values, especially when upgraded or matched across multiple reels. 

The maximum win is 5,846x the stake, a competitive figure for a high-volatility slot. While massive wins may not land frequently, the game is structured to deliver exciting spikes in reward when it aligns, particularly in free spins.

Conclusion 

Quickspin’s Book of Inferno boldly reimagines the classic “Book of” slot archetype with a heavy-metal attitude, hellish visuals, and layered gameplay that appeals to both fans of the genre and players looking for something with more bite. 

From the gripping Marked Symbol mechanics and strategic upgrades to the fiery design and orchestral doom soundtrack, every element of Book of Inferno feels intentional and impactful. It’s a game that not only makes a strong first impression but also offers long-term appeal through its evolving gameplay and dramatic bonus potential. 

While some purists may prefer the stripped-down simplicity of earlier Book games, others will find that Book of Inferno adds just the right amount of innovation to keep the experience fresh without sacrificing what makes the format timeless. 

For players who enjoy high-stakes volatility, gothic visuals, and deeply immersive slots, Book of Inferno is an infernal gem worth exploring.