Quick verdict: Book of Kings is Rarestone Gaming's take on the classic "Book of..." Egyptian slot format, published under Playtech. It sticks closely to the genre's proven formula — a spellbook wild/scatter, retriggerable free spins, and an expanding symbol — with a confirmed 96.63% RTP and High volatility. It won't surprise anyone who's played a Book of Ra-style slot before, but it's a solid, well-built example of the template.
The Story
Playtech released Book of Kings in April 2020 through Rarestone Gaming, one of its in-house development studios. There's no deep narrative — like most games in this genre, it casts you as an explorer uncovering an ancient Egyptian tomb, with a lantern-carrying adventurer character fronting the game's box art and loading screen, in the same visual tradition as Book of Ra and its many imitators.
Theme, Gameplay & Symbols
The game runs on a 5-reel, 3-row grid with 10 fixed paylines, set against a golden pyramid interior with hieroglyph-covered walls and a desert backdrop. Low-value symbols are the usual 10-through-Ace card royals in gold-and-jewel styling; higher-value symbols include a winged scarab, the Eye of Horus amulet, and a Ra/Pharaoh statuette bust, building toward the game's two spellbook symbols that drive the whole feature set.
Presentation & Sound
Presentation follows genre convention closely — a warm, golden desert backdrop, ornate hieroglyph-carved reel frame, and the kind of understated ambient soundtrack typical of this style of slot. It's polished rather than flashy, prioritising a clean, readable grid over heavy animation, which suits players who want to focus on chasing the book symbols rather than a heavily stylised presentation.
How to Play Book of Kings
- Set your stake using the bet controls — check your chosen site's paytable for the exact bet range, as this varies between operators.
- Spin the 5-reel, 10-payline grid, watching for the BOOK and BOOK AND SNAKE symbols.
- Landing 3 or more BOOK symbols anywhere on the reels triggers 10 Free Games.
- BOOK AND SNAKE symbols also act as a wild and scatter, and any Free Games triggered using them have their line wins and scatter wins tripled.
- At the start of the Free Games round, one regular symbol is randomly chosen to become a special expanding symbol for the round's duration.
- Landing 3 or more BOOK or BOOK AND SNAKE symbols during Free Games retriggers an additional 10 spins.
- Try the free demo on this page first to see the expanding symbol and free games feature in action before wagering real money.
Features & Mechanics
- BOOK symbol — acts as a wild, substituting for all symbols except BOOK AND SNAKE. Landing 3 or more anywhere triggers 10 Free Games, and pays as a scatter itself (5/4/3 symbols).
- BOOK AND SNAKE symbol — also a wild/scatter with the same paytable as BOOK, but any Free Games round it helps trigger has all line and scatter wins tripled.
- Special Expanding Symbol — chosen at random when Free Games begin (never the BOOK or BOOK AND SNAKE symbols), it can expand to cover a full reel on any winning spin during the round.
- Retriggerable Free Games — landing enough scatters during the feature awards a further 10 spins, with no stated limit on how many times this can happen.
Volatility & Win Potential
Amazon Slots confirms Book of Kings at a 96.63% RTP and High volatility. Independent sources disagree significantly on the game's maximum win multiplier — figures ranging from roughly 200x up to 15,000x stake are reported across various review sites, and the highest of these appear to actually describe a separate, similarly-named title with a different published RTP. Rather than repeat an unverified number, we'd recommend checking your chosen operator's own paytable for the confirmed max win before playing, and treating any "Book of Kings" max-win claim you see elsewhere with some scepticism unless it's sourced directly from the operator.
Pros & Cons
- Pro: Confirmed 96.63% RTP is above average for the genre.
- Pro: Retriggerable free spins with a tripling BOOK AND SNAKE symbol give real depth to the bonus round.
- Pro: Clean, well-executed take on a proven format for fans of Book of Ra-style slots.
- Con: Doesn't do much to distinguish itself visually or mechanically from the many other "Book of..." slots on the market.
- Con: No official, consistently-sourced max win multiplier is available, making it hard to judge the game's true win ceiling.
Final Verdict
Book of Kings is a competent, above-average-RTP entry in the crowded "Book of..." genre, built around a well-worn but effective formula: a tripling wild/scatter, an expanding symbol, and genuinely retriggerable free spins. It's a solid pick for players who already enjoy this style of Egyptian-themed slot, though it's unlikely to convert anyone looking for a fresh mechanical idea.
