Book of Kingdoms
Book of Kingdoms comes from Reel Kingdom, the studio operating under the Pragmatic Play umbrella that specialises in "Book of" style adventure slots. It takes the now-familiar expanding-symbol formula popularised by earlier genre entries and applies it to a medieval fantasy setting rather than an Egyptian one, giving Pragmatic Play's audience a variant with a different visual flavour but a similarly structured feature set.
Theme and Design
The game trades desert tombs for castle towers, stained glass, and illuminated manuscripts, framing its reels within an ornate medieval book motif complete with gilded page edges and a heraldic colour palette of deep reds, blues, and gold. Symbols draw on classic kingdom iconography — knights, crowns, royal seals, and mythical creatures — giving the reels a storybook, fantasy-novel quality rather than a strictly historical one. Pragmatic Play's house style typically favours crisp, high-contrast graphics and smooth animation, and Book of Kingdoms follows suit with a polished, easily readable grid. Ambient orchestral or choral music cues are common in this sub-genre, lending the whole presentation a slightly grander, more theatrical air than a standard fruit-machine slot. Subtle background flourishes — flickering candlelight, drifting dust motes, or a softly glowing page — help sell the storybook framing without pulling focus from the symbols themselves.
Gameplay and Symbols
Book of Kingdoms uses the now-standard five-reel, three-row layout with a fixed set of paylines, keeping the mechanical skeleton close to the format's originators. Card-suit symbols fill the lower rungs of the paytable, while kingdom-themed icons occupy the premium tier, topped by a special book symbol that functions as both scatter and wild. This dual-purpose book symbol is the mechanical backbone of the entire "Book of" sub-genre: landing enough copies during the base game triggers free spins, while its wild function helps complete winning lines outside the bonus round as well. The paytable is compact and easy to memorise within a spin or two, which keeps the base game approachable even for players trying the format for the first time.
Bonus Features
The headline feature is a free spins round built around a randomly selected expanding symbol: at the outset of the bonus, one symbol is chosen to expand across full reels whenever it appears, meaning a lucky pick can produce a cascade of matching wins across the grid. Because Book of Kingdoms is rated medium rather than high volatility, the expanding-symbol mechanic here tends to be tuned for a somewhat gentler swing than its higher-volatility genre cousins, with wins arriving a little more evenly across a session. Some versions in this line also include retrigger opportunities during the free spins, extending the round further when additional scatters land. A gamble feature is also a common inclusion after base-game wins in this format, giving players the option to risk a payout on a simple card-based double-or-nothing for a bit of added variance.
RTP, Volatility and Betting
Book of Kingdoms carries a listed RTP of 96.69%, a strong figure that sits comfortably above the typical industry average, paired with medium volatility. That combination suggests a more balanced rhythm than higher-volatility "Book of" titles — players should expect a reasonably steady mix of smaller wins in the base game with meaningful, though not extreme, upside once free spins are triggered. A moderate bankroll paired with moderate bet sizing should allow most players to see a representative range of outcomes, including a fair shot at reaching the bonus round more than once in an extended session. This makes the game a reasonable option for players who want to sample the expanding-symbol format without committing to the wider bankroll swings that its higher-volatility genre cousins tend to demand.
Verdict
Book of Kingdoms is a good fit for players who enjoy the expanding-symbol adventure format but prefer steadier pacing than the genre's high-volatility flagships offer. It suits a medieval fantasy aesthetic well and rewards patience without demanding an oversized bankroll to reach its best moments. Newcomers to the "Book of" format looking for a slightly gentler introduction, and existing fans wanting a fresh coat of theme, should both find plenty to like here. Its combination of a familiar, well-tested mechanic and an above-average RTP makes it a sensible default pick for anyone weighing up several similarly-themed titles side by side.
