Book of Oil Slots from Endorphina Goes Live

Online slots developer Endorphina has just published its latest game, Book of Oil. The game is quite possibly the first slot themed upon the oil mining industry, and it gives players the chance to win big through a number of exciting features.

Book of Oil slot

Book of Oil is a 5-reel slot with 3 rows and 10 fixed paylines. On the reels are symbols such as an oil tycoon, barrels of oil, and stacks of cash, and the translucent reels are set in the middle of an oil field with a city of skyscrapers visible in the background.

When players land three or more scatters on the reels, they are awarded 10 free spins with a special expanding symbol. One of the regular symbols is chosen at random to become the expanding symbol, and if enough of them land on the reels to complete a winning combination, they will expand to fill the entire reel. Better yet, a payout is awarded as long as there are enough of the symbols on the payline, regardless of whether they are adjacent to one another.

The slot also offers players a gamble feature that gives them the opportunity to double their winnings up to 10 times. Players simply need to pick from the four face-down cards, and if their card beats the dealer’s card, then the winnings are doubled. Players can either collect the winnings or try again, but one incorrect guess results in all winnings being lost.

With a top payout of 5000x and an above-average RTP of 96.05%, this slot has all the makings of another hit for Endorphina.

About Endorphina

Endorphina is a developer of online slots with its headquarters in Prague, Czech Republic. The company has produced a wide-ranging portfolio of titles with many games bringing an exciting twist to favorite themes. For more information, contact mail@endorphina.com.