Book of Inferno (Quickspin) – Review & Demo Play

Book of Inferno: Slot Overview

In Book of Inferno, Quickspin drags me into a lava-lit underworld where Anna the Demon Huntress takes centre stage. The setup is classic: 5 reels, 3 rows, 10 fixed paylines, high volatility, and a default RTP of 96.15% with lower models about. Stakes run from 0.10 to 100. The twist is how the slot blends familiar Book mechanics with Marked symbols that can expand and pay on all lines in both base game and bonus.

The sound design hits hard and the art is packed with demonic detail, so the tone fits the name. Under the hood, it is all about landing Marked symbols, upgrading them with Books, and letting expansions carry wins across the screen. That mix keeps the base game lively while you hunt the Free Spins. As a long-time Book fan, I rate this one for its heavier vibe and those upgrade moments that push symbol values up a tier.

Book of Inferno Slot Information

Book of Inferno lines up 10 pay symbols. Lows are 9, 10, J, Q, K, A, paying 8 to 12 times the bet for five. Highs are Commander of Hell, Lady of Hell, Lord of Hell, and Anna the Demon Huntress, paying 75 to 500 times the bet for a five-of-a-kind, with premiums also paying from two. The Book symbol doubles as wild and scatter and carries line wins up to 500x for five Books. The slot runs smoothly on mobile and desktop.

Wild Book of Inferno

Wild Book of Inferno is the key. It substitutes for standard symbols and pays on its own just like the top premium. Hitting 3, 4, or 5 Books anywhere pays 2x, 20x, or 200x the stake respectively. The Book can also form a five-of-a-kind line for 500x, which mirrors the max line value on Anna, and that can land in base or Free Spins.

The Book is not only a trigger. When it lands with a Marked symbol, it upgrades that Marked symbol one step up the pay ladder. If the upgrade would pass the highest tier, the mechanic converts the lowest symbol type into the highest. That interaction is where I have seen the slot jump from a decent hit to an all-line payout sequence.

Bonus Buy Feature

10-25 free spins The free spins round can be instantly triggered from the base game by buying it for 125x current bet.
Feature Cost:	x125 Bet
RTP:	-
Volatility:	-

Marked Symbol in Book of Inferno

Marked Symbol in Book of Inferno plays like an expanding feature across both phases. When enough of the chosen symbol type land to pay, every instance expands to cover its reel. Expanded reels then pay on any line position, so adjacency is not required for that extra evaluation. If a Book appears alongside, the Marked symbol upgrades one tier, which can create more Marked positions and fresh expansions. This is active in base game and fully in Free Spins.

Free Spins in Book of Inferno

Free Spins in Book of Inferno arrive with 3, 4, or 5 Books for 10, 15, or 25 spins plus 2x, 20x, or 200x instant wins. Before the round begins, a detailed grimoire flips to pick a random pay symbol as the Marked symbol for the entire bonus. That selection matters, as premiums carry bigger expanded values and can pay from two in some cases.

During the feature, landing 3 or more Books retriggers the same number of spins again. The Marked mechanic stays in play throughout, so expansions pay all lines wherever they sit. The best sequences come when Books land with your Marked symbol and push it up the ladder, letting the board fill with higher-value expansions. That is when the slot feels like it has opened and the win meter can climb quickly.

Book of Inferno Bonus Buy

Book of Inferno Bonus Buy is available at 125x your current bet and triggers Free Spins as if 3 or more Books landed. On the best model, the RTP when buying rises to 96.65%, which is a touch above the default 96.15%. I use it when I want straight access to the Marked symbol gameplay, but the base can still throw solid expanded hits thanks to Marked triggers outside the bonus.

Book of Inferno Symbols and Paytable

Book of Inferno Symbols and Paytable are clean. Lows 9 to A pay 8x to 12x for five of a kind. Premiums step up fast: Anna the Demon Huntress tops the sheet at 500x for five, the next premium sits at 160x, while others sit at 75x for five, and several pay from two. Those headline numbers apply to line wins before any expansions or multiple-line evaluations kick in.

The Book symbol is both wild and scatter and has its own scatter pays: 2, 3, 4, or 5 Books award 1x, 10x, 100x, or 500x the bet respectively. Importantly, the Book also substitutes to help connect standard lines and, when present with a Marked symbol, it upgrades that Marked tier by one. That push can turn mid-tier premiums into top-tier values within the same spin.

During Marked evaluations, expanded symbols pay anywhere on all paylines, so they do not need to be adjacent. That means a board filled with expanded reels often totals several line wins in one go, especially with premiums that pay from two. With high volatility and a listed max win of 5846x, the paytable has bite, but you will feel the swings. Bets range from 0.10 to 100, so I adjust stakes to give the Marked feature time to land.

Book of Inferno Symbols and Paytable

Symbol	Quantity	Payout
	Scatter, Wild
	5	x500
	4	x100
	3	x10
	2	x1
	5	x500
	4	x100
	3	x10
	2	x1
	5	x160
	4	x30
	3	x3
	2	x1
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x12
	4	x3
	3	x0.5
	5	x12
	4	x3
	3	x0.5
	5	x12
	4	x3
	3	x0.5
	5	x8
	4	x2
	3	x0.5
	5	x8
	4	x2
	3	x0.5
	5	x8
	4	x2
	3	x0.5