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JDB game guide

Book Of Mystery JDB: one book, one expanding symbol

In the JDB slot Book Of Mystery the golden book is a scatter that pays on any reel and also a wild that substitutes for all symbols, and 3 or more books open the Free Spin Bonus. In that bonus the game picks one symbol at random that can expand to cover a complete reel. At BolehSpin you open Book Of Mystery from the JDB lobby in your phone browser, with no app and no separate game ID, on your one BolehSpin account.

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Book Of Mystery game screen on JDB at BolehSpin
Book Of Mystery game screen on JDB at BolehSpin

At a glance

Lines
The rules page prints 10 WAYS, with 10 line patterns numbered 01 to 10
Win direction
Leftmost to right only, except the book
Wild
The golden book, substitutes for all symbols
Scatter
Golden book on any reel: 5 = 200, 4 = 20, 3 = 2 credits times the bet
Free Spin Bonus
3 or more books; a random symbol expands
Extra spins
3 or more books in the bonus = 10 more, maximum 100
Example bet
Denomination 0.02, bet multiplier 1

Lines and how pays work

The rules page prints 10 WAYS and shows 10 line patterns numbered 01 to 10. All line pays are multiplied by the bet. Only the highest line win is paid on each line played, and the symbols must appear on a betted line, on adjacent reels beginning with the leftmost reel.

All wins count leftmost to right only. The single exception is the golden book, which pays as a scatter on any reel.

The golden book: scatter and wild

The golden book appears on reels 1 to 5. As a scatter it pays on any reel: 5 books = 200, 4 books = 20 and 3 books = 2, credits times the bet. 3 or more books on the reels trigger the Free Spin Bonus.

The same book is also wild and can substitute for all symbols.

Symbols and paytable

The top symbol is the explorer woman in a brown hat: 5 = 5,000, 4 = 1,000, 3 = 100 and 2 = 10. The golden pharaoh mask pays 2,000, 400, 40 and 5. The golden scarab with a green gem and the golden falcon statue each pay 750, 100, 30 and 5. These four symbols already pay with 2 of a kind.

The letters A and K pay 150, 40 and 5 for 5, 4 and 3 symbols, while Q, J and 10 pay 100, 25 and 5. These numbers are printed for denomination 0.02 and bet multiplier 1; the rules page says all wins show for bet x 1 multiplier, and they change with your bet.

Free Spin Bonus and the expanding symbol

3 or more books trigger the Free Spin Bonus. The game randomly selects a symbol. If that symbol appears in the free game and has a winning combination after expanding, it expands and covers a complete reel. The selected symbol does not need to be adjacent, but it has to be on an active payline.

In the free game, 3 or more books trigger an additional 10 free spins, to a maximum of 100 free spins. The bonus page prints the same book pays and the same paytable as the main game.

Playing within a budget

Set a budget before you start and stop when it is gone. The rules page states that a malfunction voids all plays and pays.

Book Of Mystery paytable

Values as printed on the rules page for denomination 0.02 and bet multiplier 1 (all wins show for bet x 1 multiplier), for 5, 4, 3 and 2 same symbols on a line from the leftmost reel; they change with your bet.

Symbol5432
Explorer woman in a brown hat5,0001,00010010
Golden pharaoh mask2,000400405
Golden scarab with green gem750100305
Golden falcon statue750100305
A150405–
K150405–
Q100255–
J100255–
10100255–

Golden book scatter pay (any reel, credits times the bet)

BooksPay
5200
420
32

Rules and paytable taken from the in-game help pages in October 2026.

Play Book Of Mystery at BolehSpin

New members: free RM20 angpao, no deposit needed (Free Event games only). Terms apply.

Book Of Mystery FAQ

What does the golden book do?

It is a scatter that pays on any reel and also a wild that substitutes for all symbols; 3 or more books trigger the Free Spin Bonus.

How does the expanding symbol work?

In the bonus the game selects one symbol at random; if it has a winning combination after expanding, it covers a complete reel.

What is the maximum number of free spins?

3 or more books in the free game give 10 more spins, to a maximum of 100 free spins.

Which symbols pay with only 2?

The explorer woman, the pharaoh mask, the scarab and the falcon statue; the letters A to 10 start at 3.

How do I play Book Of Mystery on my phone?

Open the JDB lobby at BolehSpin in your phone browser and log in with your BolehSpin account; nothing to install.

More JDB game guides

Open the golden book in Book Of Mystery

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