Book of Hidden Tombs: Two Books, One Doubling Multiplier

Book of Hidden Tombs is a BGaming slot released on 20 August 2026, filed under the provider's #Classic label. It takes the familiar Book Of format, a single Book symbol that is both Scatter and Wild, and sets it in an Egyptian temple under a starry sky, with torches beside the reels and jewel-toned symbols.

The twist is a second bonus. Alongside the standard Free Spins round with its Golden Expanding symbol, BGaming has added Super Free Spins, triggered by Golden Scatters and carrying a progressive multiplier that can reach ×512. The game pays on 10 lines, and two shortcuts, Chance ×2 and Buy features, sit in the main screen.

BGaming lists the RTP at 97.00% and rates the volatility as High. The maximum multiplier is published as x10000, and the spec sheet shows the top win as €250,000. The FAQ on the provider's game page gives the same ceiling as ×10,000 the bet.

The provider also publishes a hit rate of 4.23 and an FS rate of 196.6, alongside a line count of 10. Neither rate carries a unit or a definition on the game page, so we quote them exactly as BGaming gives them rather than turn them into odds.

According to BGaming, the max win may be reached with the progressive multiplier in Super Free Spins. That places the top of the range in the second bonus, not the standard round, which fits the High volatility rating.

The Book symbol does two jobs. It substitutes for any symbol in a winning combination, and 3 or more Books anywhere on the reels trigger Free Spins.

That double role is the core of every Book Of game, and BGaming keeps it intact here. A Book that helps complete a line in the main game also counts towards the Free Spins trigger, so a spin with two Books on the reels is one symbol short of the bonus while still able to pay on the lines.

Land 3 or more Book Scatters to win 10 Free Spins. Before the round starts, the game picks one random symbol, never the Scatter, to act as the Golden Expanding symbol for the whole feature.

When 2 or 3 of that Golden symbol appear during a free spin, they expand to fill their reels and pay on all 10 lines regardless of position. Because the expanded symbol covers whole reels, it does not need to line up on a single payline to count, which is where the larger Book Of wins come from.

Landing 3 or more Books during the round retriggers it with 10 additional spins. BGaming does not publish a limit on retriggers on its game page, nor the paytable values for each symbol, so the in-game paytable is the place to see what a high-paying Golden symbol is worth compared with a low one.

Super Free Spins are triggered by 3 or more Golden Scatter symbols. BGaming says the round works like standard Free Spins but adds a progressive multiplier, and its game page does not give a separate spin count for it.

The multiplier rule runs the opposite way to most climbing multipliers. It starts at x1 and doubles after every spin that ends without a win. When a win lands, the current multiplier is applied to it and the value resets. The cap is ×512.

As an illustration of the rule, nine losing spins in a row would take the multiplier from x1 through x2, x4, x8, x16, x32, x64, x128 and x256 to the ×512 cap, and the next win would be multiplied by 512. A win on the second spin, by contrast, would only be doubled before the multiplier reset. Dry spells therefore build value, and early wins spend it.

Chance ×2 slightly increases the bet to double the probability of triggering Free Spins. BGaming does not state the exact bet increase on its game page, and the option is disabled while Buy Bonus is active.

Buy features let you start either Free Spins or Super Free Spins straight from the main game screen. The prices appear in a pop-up and adjust automatically to the selected bet, and the next spin after a purchase starts the chosen bonus.

The provider's game page does not list the purchase prices, so read the cost in the pop-up at your chosen stake before using either option. A bought Super Free Spins round runs under the same doubling multiplier rule described above.

The demo is the easiest way to learn the two bonuses without staking anything. In Free Spins, note which symbol is chosen as the Golden Expanding symbol and how often 2 or 3 of it land together, since that is what turns a spin into a full-line win.

In Super Free Spins, watch the multiplier counter rather than the reels. Track how high it climbs before a win lands and how often small wins reset it early. Then open the Buy pop-up to compare the cost of each bonus at your stake.

BGaming says the game runs on mobile, tablet and desktop. Slots are for adults aged 18 and over; set a time and spending limit before any session.

Other recent BGaming releases on SlotsCritic: Red and Hot Chilli, Divine Queen: Power of Sun, Cats Love Yummy, 3 Lucky Monkeys Hold & Win, Bonanza Billion Merge Up™+ and Red Hot Chilli Chickens.

What is the RTP of Book of Hidden Tombs?

BGaming lists the RTP of Book of Hidden Tombs at 97.00%, with volatility rated High and 10 paylines. The spec sheet also shows a hit rate of 4.23 and an FS rate of 196.6, published without units. RTP is a long-run average over a very large number of spins, so a single session can return far more or far less.

What is the max win in Book of Hidden Tombs?

The maximum multiplier is x10000, and BGaming's spec sheet gives the top win as €250,000. The provider's FAQ says the ×10,000 ceiling may be reached with the progressive multiplier in Super Free Spins, which doubles after every losing spin and can climb as high as ×512 before it is applied to a win.

How do Free Spins work in Book of Hidden Tombs?

Three or more Book Scatters award 10 Free Spins. Before the round, one random symbol other than the Scatter becomes the Golden Expanding symbol. When 2 or 3 of it appear, they expand to cover their reels and pay on all 10 lines regardless of position. Another 3 Books during the round add 10 more spins.

What are Super Free Spins in Book of Hidden Tombs?

Super Free Spins are triggered by 3 or more Golden Scatter symbols and work like the standard round with an added progressive multiplier. It starts at x1, doubles after each spin without a win, and is applied and reset when a win lands. BGaming caps the multiplier at ×512.

Does Book of Hidden Tombs have a bonus buy?

Yes. Buy features let you start Free Spins or Super Free Spins from the main screen, with prices shown in a pop-up that adjusts to your bet, and the bonus begins on the next spin. BGaming does not publish the prices on its game page. Chance ×2 doubles the Free Spins trigger chance but is disabled during Buy Bonus.