Book of Hidden Tombs Slot Review – Demo, RTP & Features

Book of Hidden Tombs is a high-volatility online slot from BGaming that returns to the classic Egyptian Book formula with expanding symbols, Free Spins and a more aggressive Super Free Spins feature.

Played across 5 reels, 3 rows and 10 pay-lines, the setup will immediately feel familiar to anyone who has spent time with traditional Book-style slots.

Ancient Egypt provides the backdrop, with Ra, Anubis, Bastet and an explorer appearing among the premium symbols. The Book itself performs two jobs as both the Wild and Scatter, helping complete regular combinations while also providing the route into the bonus features.

BGaming hasn’t attempted to completely reinvent this long-established format. Instead, the biggest change comes from Super Free Spins, where the usual expanding-symbol mechanic is joined by a Progressive Multiplier that doubles following every losing spin. This creates an unusual situation where a run without a payout can actually make the next successful hit considerably more valuable.

The mathematical profile is another strong point. Book of Hidden Tombs offers a 97% RTP, a 24.39% hit frequency and maximum wins of 10,000x the bet.

Stakes range from €0.10 to €25 per spin, while the high volatility means results can be uneven, particularly when chasing the larger expanding-symbol combinations.

Game Features

Scatter Wild

The Book symbol acts as both a Wild and Scatter. As a Wild, it can substitute for regular paying symbols to help complete combinations across the game’s 10 paylines.

The Book also functions as a Scatter and can produce payouts regardless of its position on the reels. Landing 3 Scatter Wilds activates one of the game’s Free Spins features.

Free Spins

Landing 3 Book Scatters normally awards 10 Free Spins. Before the first free spin begins, one of the regular paying symbols is randomly selected to become the Golden Expanding Symbol. This symbol remains selected throughout the entire feature.

Whenever enough instances of the Golden Expanding Symbol appear to create a winning combination, they expand vertically to cover their respective reels. The expanded symbol is then evaluated across all 10 paylines, allowing several line wins to be created simultaneously.

As with traditional Book slots, the quality of the selected symbol can make a substantial difference. Getting one of the premium characters as the Golden Expanding Symbol gives the bonus considerably greater payout potential than receiving one of the lower-paying card symbols.

Golden Expanding Symbol

The Golden Expanding Symbol does not need to appear in identical positions across adjacent reels. Instead, if enough instances land to create a qualifying win, each reel containing the selected symbol expands before the payout is calculated.

This is what allows a handful of correctly positioned premium symbols to potentially produce multiple winning paylines at once.

The mechanic is deliberately traditional and forms the core of both bonus modes.

Super Free Spins

When 3 Scatter symbols trigger the bonus, there is a chance that Super Free Spins will be awarded instead of the standard feature.

Super Free Spins retain the same Golden Expanding Symbol mechanic but introduce a Progressive Multiplier.

The multiplier starts at x1. Every time a free spin produces no win, the multiplier doubles. This creates the possibility of the progression moving through values such as:

x1 → x2 → x4 → x8 → x16

The multiplier continues increasing following unsuccessful spins until a winning result arrives. This mechanic gives otherwise disappointing dead spins a purpose, since each one increases the potential value of a later payout.

Combined with a premium Golden Expanding Symbol, a sufficiently developed multiplier can make Super Free Spins considerably more powerful than the standard bonus.

Chance x2

Players can increase the probability of reaching Free Spins through the optional Chance x2 feature.

Activating it costs an additional 0.5x the standard bet and doubles the probability of triggering the Free Spins feature. This does not guarantee entry into the bonus; it simply increases the trigger chance while the option remains active.

Feature Buy

Where Feature Buy mechanics are permitted, Book of Hidden Tombs provides direct access to its bonus rounds.

Free Spins – 100x the bet

This purchase immediately activates the standard 10 Free Spins feature with a randomly selected Golden Expanding Symbol.

Super Free Spins – 200x the bet

This option provides direct entry to Super Free Spins, adding the Progressive Multiplier to the expanding-symbol gameplay.

Bonus Buy availability can vary depending on the casino and local regulations.

RTP and Volatility

Book of Hidden Tombs has an RTP of 97%, which is notably strong compared with many modern online slots. Its reported hit frequency is 24.39%, while the game operates with high volatility.

This combination means ordinary wins can appear reasonably regularly, but the more substantial payouts remain heavily dependent on stronger symbol combinations and successful bonus rounds.

Bets range from €0.10 to €25 per spin.

10,000x Maximum Win

The largest possible payout is 10,000x the bet. Reaching the upper end of the game’s potential is closely connected to the expanding-symbol bonuses, particularly when premium symbols combine with a substantial Progressive Multiplier during Super Free Spins.