Book of Hidden Tombs: Free Spins, 512× Multiplier & RTP

Book of Hidden Tombs: Free Spins, 512× Multiplier & RTP

Book of Hidden Tombs is an upcoming high-volatility slot from BGaming that takes the familiar Book Of format into an Ancient Egyptian setting. Scheduled for release on 20 August 2026, the game combines Scatter-Wild Books and Golden Expanding symbols with two Free Spins modes, including Super Free Spins where a progressive multiplier can climb as high as 512×. The maximum win is capped at 10,000× the bet.

Book of Hidden Tombs screenshot

Book of Hidden Tombs Game Details

Book of Hidden Tombs uses a 5×3 reel layout with 10 paylines. BGaming lists a 97.00% RTP, high volatility and a 4.10% hit rate, while Free Spins occur at a stated rate of 1 in 195. The maximum payout is €250,000, subject to the game’s 10,000× maximum multiplier.

The main game follows a traditional payline structure, but most of the added complexity appears once the Book symbols begin interacting with the two Free Spins modes.

Scatter-Wild Book and Golden Expanding Symbols

The Book is both the Wild and Scatter symbol. As a Wild, it substitutes for regular symbols to help complete winning combinations. Landing three or more Books activates the Free Spins feature.

The standard bonus always begins with 10 Free Spins. Before the round starts, one regular symbol other than the Scatter is randomly selected as the Golden Expanding symbol. Depending on which symbol has been chosen, landing two or three copies causes it to expand vertically across its reels. Wins are then evaluated across all 10 paylines regardless of the exact position of the expanded symbols.

Three or more Book symbols appearing during Free Spins retrigger the feature and award another 10 spins, allowing the Golden Expanding symbol to remain in play for a longer bonus sequence.

Book of Hidden Tombs Free Spins award

Super Free Spins and the 512× Progressive Multiplier

Book of Hidden Tombs also offers a more powerful Super Free Spins mode. A Scatter Collector positioned above the reels can activate before the standard Free Spins round begins. When it does, the Scatters responsible for triggering the feature become Golden and the game launches Super Free Spins instead.

The expanding-symbol mechanic remains active, but Super Free Spins add a progressive multiplier that starts at 1×. Every spin without a win doubles its current value. A sequence can therefore move from 1× to 2×, 4×, 8× and continue increasing, with the multiplier capped at 512×.

Once a winning spin occurs, the accumulated multiplier is applied to that win before the multiplier progression resets. This makes consecutive non-winning spins potentially important rather than simply unsuccessful, as they build the multiplier available for a later payout.

Super Free Spins multiplier

Buy Bonus and Chance ×2

Players can access either Free Spins or Super Free Spins directly through the Buy Bonus menu. The purchase value adjusts to the selected stake, and the next spin after completing the purchase launches the chosen bonus round. BGaming’s rules also include a Rebuy option for repeating the most recently purchased bonus.

Alternatively, Chance ×2 slightly increases the stake in exchange for doubling the probability of triggering Free Spins naturally. Chance ×2 is disabled whenever the Buy Bonus feature is active.

Book of Hidden Tombs Buy Bonus menu

Pros & Cons

Book of Hidden Tombs Summary

Book of Hidden Tombs builds on familiar Book Of mechanics rather than replacing them. The traditional Scatter-Wild Book and expanding bonus symbol remain central to the game, but BGaming adds a second Free Spins route with a progressive multiplier that changes the rhythm of the bonus.

The standard Free Spins mode focuses on Golden Expanding symbols and retriggers, while Super Free Spins add the possibility of building the multiplier as high as 512×. Combined with a 97.00% RTP, Buy Bonus, Chance ×2 and a 10,000× maximum win, the result is a more feature-heavy interpretation of the traditional Egyptian Book slot format.