Book of Fusion Slot Review
Light & Wonder have positioned Book of Fusion as a departure from traditional Egyptian-themed book slots, instead opting for an alchemy and fusion aesthetic that modernises a well-established mechanic. Released in July 2022, the game combines straightforward base game mechanics with an engaging bonus round featuring dual expanding symbols—a feature relatively unorthodox compared to standard book slots that typically rely on singular expanding mechanics.
Base Game & Features
Book of Fusion operates on a traditional 5×3 grid with 10 paylines, offering a straightforward reel structure that prioritises clarity over complexity. The base game mechanics follow standard slot conventions, though the core mechanics remain competent and feature-rich in their execution. The game’s design philosophy emphasises the bonus round rather than base gameplay, which aligns with Light & Wonder’s established approach to mechanical design.
Special Symbols and Features
The central symbol in Book of Fusion is the Book symbol, which performs double duty as both a wild symbol substituting for all paying symbols and a scatter symbol triggering the bonus round. This dual-function approach is distinctive visually and mechanically. The Book symbol features a distinctive visual presentation that distinguishes it from standard slot symbols whilst maintaining functional clarity.
Book of Fusion Free Spins
The free spins round is where Book of Fusion truly comes into focus. Landing 3, 4, or 5 Book symbols triggers the feature and awards 10 free spins, with payout multipliers attached to the trigger: 2x for 3 Books, 20x for 4 Books, and 200x for 5 Books respectively. During free spins, the mechanics shift notably as two selected symbols expand to full reel height, creating more winning opportunities. The expansion requirements differ by symbol value: high-paying symbols need 2+ occurrences to expand, whilst low-paying symbols require 3+, adding strategic depth to the bonus mechanics.
The dual expanding symbols setup creates genuine excitement and pay potential, with the ability to retrigger for additional spins—a feature that extends bonus sessions and increases win potential meaningfully. This mechanic makes the free spins round with its expanding symbols more rewarding and exciting compared to standard single-expanding symbol mechanics commonly seen across similar book-themed releases.
Bonus Buy & Ante Bet
Book of Fusion includes a Bonus Buy feature available for players outside the UK. The feature costs 70x your current bet to activate directly, allowing players to skip straight to free spins without waiting for the scatter symbols to land naturally. When using Bonus Buy, the RTP adjusts slightly to 95.98%. This feature is available to non-UK players due to UK Gambling Commission (UKGC) regulatory restrictions on bonus purchase mechanics for UK-licensed operators.
Our Honest Verdict
Rating: 4.1/5
Book of Fusion delivers a competent feature-driven slot that positions itself squarely within the high volatility space with legitimate appeal. Light & Wonder have opted for simplicity in the base game, focusing their design effort on crafting an engaging bonus round that justifies the overall package. The 7,142x maximum win potential is substantial and realistic given the high volatility mechanics, particularly the dual expanding symbols during free spins that create the mathematical pathway to reach this level. With an RTP of 95.97% (rising to 95.98% with Bonus Buy), the game sits at the stronger end of the volatility spectrum without entering truly extreme territory.
The non-Egyptian alchemy theme with electric lightning effects offers a refreshing aesthetic take on the traditional book slot genre, modernising what had become somewhat formulaic mechanics. The expanded symbol mechanics differentiate the game meaningfully from standard single-expanding variants—players receive two expanding symbols during free spins rather than one, creating more frequent and varied winning combinations. The ability to retrigger additional spins maintains engagement and extends session potential.
The primary trade-off is base game simplicity. Between bonus triggers, the game delivers standard 5×3 mechanics without modifiers or in-spin enhancements, meaning the base game itself lacks mechanical complexity. Players accustomed to feature-rich base games or high frequency low-volatility mechanics may find extended dry spells between bonuses somewhat tedious. This is deliberate design—Light & Wonder have clearly concentrated their effort on creating an attractive bonus round rather than supplementing base gameplay with additional mechanics.
Book of Fusion sits comfortably as a worthy choice for players seeking a non-Egyptian twist on book-themed slots with genuine high-volatility big win potential. It appeals most to players who prioritise feature-rich bonus rounds over constant base game action, and those comfortable with the variance profile required to reach the 7,142x maximum multiplier. Players seeking more balanced volatility or consistent base game engagement should explore other options within Light & Wonder’s catalogue or alternative providers.
Frequently Asked Questions
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What is the RTP of Book of Fusion?
The RTP of Book of Fusion is 95.97%. The game offers multiple RTP variants available at 89.99%, 93.98%, and 95.97% depending on where you play. When using the Bonus Buy feature to purchase free spins directly, the RTP is slightly higher at 95.98%. -
What is the maximum win on Book of Fusion?
The maximum win on Book of Fusion is 7,142x your stake. This high maximum win potential combined with the high volatility nature of the game makes it attractive to players seeking big win opportunities. The dual expanding symbols during free spins create the mechanics that enable reaching this substantial multiplier. -
How volatile is Book of Fusion?
Book of Fusion has high volatility, meaning wins are less frequent but potentially larger when they occur. This volatility is suitable for players with larger bankrolls who prefer the excitement of potentially bigger payouts over steady, frequent wins. The game is designed with volatility in mind, concentrating win potential in the bonus round rather than the base game. -
Does Book of Fusion have free spins?
Yes, Book of Fusion features a free spins bonus round. Landing 3, 4, or 5 Book symbols triggers the feature and awards you with 10 free spins. The payout multipliers are 2x, 20x, or 200x your bet respectively for 3, 4, or 5 Books. During free spins, two pay symbols are selected as expanding symbols that cover entire reels, creating more winning opportunities and extended winning potential through retriggerable additional spins. -
Can I play Book of Fusion on mobile?
Yes, Book of Fusion is fully compatible with mobile devices. The game uses HTML5 technology and is optimised for play on smartphones and tablets running iOS, Android, Windows, or macOS. No download is required and the game maintains full functionality and graphics on mobile platforms. -
What is the bonus buy cost for Book of Fusion?
The Bonus Buy feature costs 70x your current bet and is available for players outside the UK. Using Bonus Buy allows you to skip straight to the free spins round without waiting for the scatter symbols to land naturally. The RTP when using Bonus Buy is 95.98%. This feature is restricted to non-UK players due to UK Gambling Commission regulations. -
What are the main features of Book of Fusion?
Book of Fusion’s main features include: the Book symbol acting as both wild and scatter, a free spins bonus with 10 spins triggered by 3+ Books, expanding symbols during free spins that cover entire reels and increase win frequency, a Bonus Buy option to purchase entry to the bonus round directly, and retriggerable additional free spins for extended bonus sessions. The dual-expanding symbol mechanic is the standout feature that differentiates it from standard book-themed slots. -
What is the bet range for Book of Fusion?
The bet range for Book of Fusion is £/€0.10 to £/€35 per spin. This allows both casual players with smaller budgets and high-rollers to enjoy the game. The wide betting range combined with high volatility makes it suitable for various player preferences and bankroll sizes, from cautious low-stake players to aggressive big-bet enthusiasts.
