Book of Sherlock Slot Review

Book of Sherlock places its slot in 1970s and 1980s England and gives the Book symbol a dual role: it acts as both Wild and Scatter. Three or more Books trigger ten Free Spins, but the feature’s defining choice happens before they begin—a symbol is selected to become the Special Expanding Symbol. During Free Spins, that symbol expands across the reels, acts as a Scatter and pays wherever it appears. This sequence links the trigger symbol to a second, chosen symbol that shapes the bonus. The page also mentions retriggerable Free Spins and clue-based Bonus Spins, although it does not fully explain the clue mechanic.

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Book of Sherlock at a glance

Provider	PopOK Gaming
Genre / theme	Crime & Detectives
Game type	Video slot
Reference RTP	96.09%
Payout mechanic	10 paylines
Maximum win	x5,000 the bet
Main features	Book is Wild and Scatter; 3+ Books trigger 10 Free Spins after a symbol is selected to expand and pay as a Scatter. Free Spins can retrigger; collecting Clues can award Bonus Spins.

RTP and stake limits can vary by version and market. Check the information screen in the game you open. Maximum win is a ceiling, not an expected result.

Ten paylines and the dual-purpose Book

PopOK describes ten paylines and calls the gameplay classic. It does not specify reel dimensions, payline direction or symbol awards in the visible description. The Book symbol is both Wild and Scatter, which gives it two distinct functions: it can support regular combinations as a Wild and contribute to the bonus trigger as a Scatter. The exact substitution exclusions are not stated, so it would be unsafe to assume that Book replaces every other symbol. Its dual identity is nevertheless the key to the feature entry described on the official page.

Landing three or more Books starts ten Free Spins. Before the round, one symbol is chosen as the Special Expanding Symbol. During the feature, that chosen symbol expands across the reels, acts as a Scatter and pays wherever it appears. The selection step matters because the bonus’s central symbol is not fixed in the description; the chosen symbol determines what can expand and award across the screen. PopOK says the feature can be retriggered, but the exact retrigger threshold and extra-spin award are not provided in the visible text. The initial ten spins are clear, while later extensions remain less defined.

Expansion, Scatter payment and clues

The Special Expanding Symbol is described as paying wherever it appears during Free Spins, while also acting as a Scatter. That gives it a broader role than a Wild restricted to completing one of ten paylines. However, the page does not specify whether it must appear on a minimum number of reels, how its payout is calculated, or whether it can expand more than once per spin. Those details would determine the actual bonus rhythm and should be left open until the in-game rules clarify them.

Configuration and setting

PopOK lists 96.09% RTP, x5,000 maximum multiplier, and EUR 0.02 to EUR 100 bets. It does not state volatility or release date. The source places the story in England in the 1970s and 1980s and centers it on Sherlock Holmes, supporting crime-detectives as the truthful genre. The maximum multiplier is a ceiling, not a likely result. These numbers give a basic profile, while the absent reel dimensions and clue rules limit comparison with other detective-themed slots.

Strengths and weak points

Strengths

The Book symbol has two documented functions, and the ten-spin bonus adds a preselected expanding symbol that also acts as a Scatter and pays wherever it appears.

Weaknesses

The reel layout, Book exclusions, retrigger award, expanding-symbol payment threshold and clue rules are not stated, limiting a full feature model.

Our Editor’s View

Book of Sherlock combines ten paylines with a Book symbol that acts as both Wild and Scatter. Three Books start ten Free Spins after a symbol is chosen to expand, act as a Scatter and pay wherever it appears. PopOK also lists retriggers and clue-based Bonus Spins, but gives few details on their thresholds or awards. The dual Book role and preselected bonus symbol create a coherent feature sequence, while the clue mechanic remains an open question. The official page lists 96.09% RTP and x5,000 maximum multiplier, with no volatility label. Its 1970s–80s English detective setting gives it a clear genre; readers should consult the full rules to understand how clues extend the mystery beyond Free Spins.