Book of Evil — RTP, volatility and max win

Book of Evil by SpinOn opens a dark tome in which a devil and vampires take over the reels. It plays by the familiar book formula: the book starts the free spins, a special symbol is picked before the round, and during the free spins it expands over entire reels.

The theme of Book of Evil brings together the lord of hell and bloodsuckers, with the book as the central symbol that ties the mechanics together. A 5×3 set of reels with 10 paylines gives it the classic layout of a book slot. Stakes per spin range from €0.20 to €50. The slot was released on September 18, 2024.

Like Book of Evil, every book title in the catalogue has high volatility, since the wins come almost entirely from one round; the spread across all levels is shown in inferno slots by volatility.

Book of Evil pays along fixed lines, so identical symbols must occupy one of the 10 paylines, reel after reel from the left. Each line is paid on its own, and hits on several lines in the same spin are added together. The book acts as a wild for every regular symbol and also counts as the scatter that triggers the free spins regardless of the lines. In the bonus round the special symbol follows its own rule and pays even on non-adjacent reels.

Free spins with a special symbol: enough books start the round, and a randomly chosen symbol becomes the special symbol. When it lands during the free spins, it expands over the whole reel and pays on every line once it covers enough reels.

Extra free spins: if enough books show up again during the round, more free spins are added, with the same special symbol.

Bonus buy: the free spins can be bought directly, no waiting for the books.

In Book of Evil, the expanding special symbol decides the free spins round; slots built around the same effect are listed under inferno slots with expanding symbols.

RTP 94%. Background: how RTP works on a slot. Volatility High, like 85 of the 180 slots in the Hell & devil theme. Background: what slot volatility means. Max win 5,000× (€250,000 at the highest stake).

An RTP of 94% places Book of Evil at the lower end of the field. Volatility is high, while the cap of 5,000× sits in the middle, larger than that of around 51% of slots. As with every book slot, nearly everything depends on which symbol becomes the special symbol in the free spins.

Book of Evil circulates at different payout levels depending on the casino; where the listed figure stands is shown in inferno slots ranked by RTP.

Near Book of Evil: slot games with a near-equal RTP, a hell theme on the reels plus high-volatility maths.