Book of Oil

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Rules and Gameplay

Dive into the enthralling world of the Book of Oil slot, a creation by Endorphina that captivates with its oil exploration theme. This game operates on a classic 5×3 layout, offering 10 adjustable paylines for players to bet on. The essence of gameplay revolves around aligning symbols from left to right across the paylines to secure wins. The betting range is quite broad, accommodating both conservative players and high rollers, with the option to adjust the number of active paylines, thus tailoring the gaming experience to one’s strategy and budget. The hallmark of this slot is the versatile book symbol, serving as both a wild and a scatter, pivotal for unlocking the game’s special features.

Bonus Features

The Book of Oil slot is packed with enticing bonus features designed to amplify your gaming excitement and winning chances:

  • Free Spins: Trigger this mode by landing three or more book symbols anywhere on the reels, granting ten free spins accompanied by a randomly chosen expanding symbol for enhanced payouts.
  • Gamble Feature: A thrilling opportunity to double your winnings through a card game, this feature challenges players to outdo the dealer’s card, with the possibility to attempt up to ten times.
  • Buy Feature: For those eager to directly engage with the free spins action, this feature allows players to purchase instant access, bypassing the standard trigger mechanism.
  • Scatter/Wild Symbol: The book symbol enriches gameplay by substituting for other symbols to form winning combinations and activating the free spins round, serving a dual purpose.


Each symbol in Book of Oil is meticulously designed to align with the game’s oil venture theme, ranging from high-value characters to classic card symbols:

  • Businessman with Black Glasses: Symbolizes the apex of success in the oil industry, offering the highest payout.
  • Oil Barrels and Money: These symbols represent the tangible assets and wealth generated from oil extraction.
  • Book Symbol: A pivotal icon, acting as both wild and scatter, it plays a critical role in enhancing winning combinations and unlocking bonus features.
  • Playing Cards (Ace, King, Queen, Jack, Ten): Constitute the lower-paying symbols, ubiquitous in slot games, yet integral to accumulating wins.


Book of Oil promises lucrative payouts, with the potential for significant rewards through its structured paytable:

Symbol 5x Payout
Businessman with Black Glasses x5000
Oil Barrels and Money x750
Playing Cards (Ace, King) x150
Playing Cards (Queen, Jack, Ten) x100

The game’s high variance nature suggests that wins may come less frequently but are more substantial when they do, particularly during the free spins feature where the expanding symbols can significantly increase payout potential.


With 10 adjustable paylines at your disposal, Book of Oil offers a versatile betting landscape that caters to a variety of playing styles. Players have the autonomy to select the number of paylines they wish to activate, impacting both the total bet and the likelihood of hitting winning combinations. This flexibility allows players to strategize according to their risk tolerance and game plan, making each spin a tailored experience. Paylines pay from left to right, requiring players to match symbols in succession to secure wins.

Pros & Cons

Pros Cons
High RTP of 96.05% High variance might not suit all players
Engaging theme with high-quality graphics Limited bonus features compared to some other slots
Flexible betting options with adjustable paylines Max win potential is not specified, which may deter some high rollers

Minimum and Maximum Bet

The betting range in Book of Oil caters to a wide array of players, from beginners to seasoned slot enthusiasts. The minimum bet starts at just $0.01, allowing for a low entry point for those wishing to play conservatively or simply explore the game’s features without a significant investment. On the other end of the spectrum, the maximum bet can go up to $50 per spin, offering the possibility for larger bets and correspondingly higher wins. This range ensures that the game is accessible to players with varying bankrolls and risk appetites.

Game Jackpot

While Book of Oil does not feature a traditional jackpot, its gameplay is designed to offer substantial winning opportunities, highlighted by its RTP (Return to Player) of 96.05% and high variance. This combination indicates that while wins may not occur on every spin, the potential for significant payouts is elevated, especially for those who play patiently and strategically. The game’s design inherently caters to those seeking the thrill of potentially large wins that high variance slots can offer, making every spin exciting.

About Provider

Endorphina, the developer behind Book of Oil is renowned for its high-quality online slot games that blend engaging themes with innovative gameplay mechanics. With a focus on creating immersive experiences, Endorphina’s slots are distinguished by their detailed graphics, compelling soundtracks, and intuitive interfaces. The provider has established a solid reputation in the iGaming industry for its commitment to fairness, reliability, and the ability to entertain and engage players across a wide range of interests and preferences.

How To Play

  • Start by setting your desired bet amount. Adjust the number of active paylines you wish to play with, and modify the bet per line to suit your budget and playing style.
  • Once your bet is set, press the spin button to start the game. Watch as the reels come to a stop, revealing potential winning combinations based on the symbols that appear.
  • If you land on a winning combination, you have the option to take your winnings or enter the gamble feature for a chance to double your payout. Choose wisely, as this feature can also result in a total loss of your winnings from that spin.
  • Keep an eye out for the book symbol, which acts as both a wild and a scatter. Landing three or more book symbols triggers the free spins feature, where a special expanding symbol is chosen at random to increase your winning potential during the free spins round.
  • Continue playing as long as you like, adjusting your bet settings as desired between spins. Remember to play responsibly and set limits for yourself to ensure a fun and sustainable gaming experience.


Book of Oil stands out as a captivating slot game that combines an intriguing theme with the potential for significant payouts, thanks to its high RTP and high variance. The game’s engaging mechanics, including the dual-function book symbol and the gamble feature, offer a dynamic and exciting gameplay experience. Whether you’re drawn to the game for its thematic depth or the thrill of its high variance play, Book of Oil by Endorphina is sure to provide hours of entertainment and the chance for rewarding wins. With its wide betting range, it welcomes players of all levels to explore the riches hidden beneath the earth’s surface.