Casino
Book of Oil
Endorphina slot - available on desktop
About Book of Oil
Book of Oil is a five-reel slot from Endorphina with a standard grid layout and adjustable bet denominations. The game mechanics center on a book symbol that functions as both scatter and wild, triggering free spins when three or more land in a single spin. During the bonus round, the book expands across reels to create additional winning combinations. Paylines remain fixed during base play, with bet adjustment available before each spin. The slot uses traditional reel mechanics without cascading or cluster-pay systems.
Game Features
- Book symbol acts as both scatter and wild
- Free spins triggered by three or more scatters
- Expanding symbols during bonus rounds
- Fixed paylines across base game
- Adjustable bet denominations
Book of Oil: how to start
Find Book of Oil through the lobby search. Signed-in players play for real money; guests can open the demo where the studio provides one.
Set the bet per spin before you play; the in-game paytable lists symbol values and bonus triggers. WickedBet takes Bitcoin, Ethereum, USDT and other major coins; what you deposit is what you play with.
Play Book of OilMore Endorphina Games
Frequently Asked Questions
What happens when the Book symbol lands during the bonus round?
The Book symbol expands across reels during free spins, creating additional winning combinations beyond what appears in the base game. This expansion mechanic increases your chances of landing bigger wins during the bonus round.
How many Book symbols do I need to trigger free spins in Book of Oil?
Three or more Book symbols must land in a single spin to trigger the free spins bonus round. The Book functions as both scatter and wild, so it counts toward bonus activation regardless of position on the reels.
Can I adjust my bet in Book of Oil?
Yes, Book of Oil features adjustable bet denominations, allowing you to modify your stake before each spin according to your preferred wagering level.
How many paylines does Book of Oil have?
Book of Oil uses fixed paylines during base game play, meaning all available lines remain active on every spin and cannot be adjusted or disabled.
Does the Book symbol act differently than regular symbols in Book of Oil?
The Book symbol serves dual functions as both scatter and wild, making it the most valuable symbol in the game. It triggers free spins when landing in multiples and substitutes for other symbols to complete winning combinations.
