Key takeaways
- The book is wild and scatter.
- Three books: ten free spins.
- One symbol expands.
- Very high volatility.
In shortA book slot uses a book symbol as both wild and scatter. Three trigger ten free spins in which one randomly chosen symbol expands to fill reels.
The formula
- Three books award ten free spins.
- One symbol is chosen at random to expand.
- When enough land, it fills its reels and pays on all ten lines.
The benchmark
| Slot | Developer | RTP | Volatility | Max win | Layout |
|---|---|---|---|---|---|
| Book of Dead | Play'n GO | 96.21% | High | 5,000x | 5 reels, 3 rows |
Why it is so volatile
Everything depends on which symbol is chosen. The top symbol across five reels is the 5,000x maximum; a card rank usually pays little.
A family
Dozens of 'book of' slots from many studios follow the same pattern with different themes.
Elsewhere on the site: Slot machine finder, Video slot machines, Wild symbols and Sweet Bonanza vs Big Bass Bonanza.
The gamble button
Many book slots offer to double any win on a card colour. It is a fair bet with no house edge, and on a machine this volatile it is rarely needed.
Keep reading: Megaways slot machines, Slot machine bankroll guide, Starburst vs Big Bass Bonanza and Ways-to-win slot machines.
Slot figures are developers' published defaults, each confirmed against two sources; the version at your casino can differ. UK land-based stake and prize limits and online rule dates were checked against Gambling Commission and licensing authority sources on 6 October 2026. History follows commonly cited accounts. Offer terms dated 5 October 2026. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
What is a book slot?
One with a wild-scatter book and an expanding symbol.
Which is the best known?
Book of Dead.
Are they volatile?
Very.
How many free spins?
Usually ten.