Book of Oil

Play Book of Oil

Our Bitcoin Casino presents Endorphina’s Book of Oil slot, a title with 5 reels and 10 paylines. As the name suggests, Book of Oil has a theme inspired by one of the most important commodity in the world. If you are interested in the extraction of oil this can be the right slot for you. Learn how to become an oil tycoon and win huge prizes in the process. Since it’s a title that is basically a clone of “Book of Ra” we get the bonus features that one would expect. The book is both the wild and the scatter of the game. As a wild it substitutes for other symbols and as a scatter it triggers the well-known free spins feature. Players can enjoy a gamble feature as well which is expected from an Endorphina title. Play Book of Oil, enjoy the gameplay, and win the highest prize.


Book of Oil comes with a 5×3 grid and 10 paylines just like most “Book of Ra” clones. The paylines are not fixed as the players can choose any number from 1 to 10. However, the best gameplay comes when all 10 paylines are active. As mentioned above, the oil industry serves as an inspiration for the theme of this game. In the background, you’ll see some shining buildings and you’ll also see oil drills drilling away along with some barrels. The background sounds are soothing and complement the theme. Additionally, there are sound effects every time you click a button, spin the reels, or win. When it comes to bonus features, we mentioned there is a wild as well as a scatter that triggers free spins. The RTP of the game is 96.05% which is the industry average. Play Book of Oil and Win Big!

Book of Oil Stakes

When it comes to wagers, they can be as little as 10 coins per spin, all the way up to 100 coins per spin. However, this title allows you to change the coin size as well. It can be 0.05, 0.1, 0.2 or 0.5. Conversely, this sets the maximum bet in this game to 500.00 coins per spin. While you play Book of Oil, the button to control the stakes will be on the bottom left, right below the reels.

For instance, this slot game features 10 paylines and in order to calculate your winnings, you need to look at the following formula:

coin size x bet per line x 10 = total winnings.

Book of Oil Paylines

The Book of Oil slot has 10 paylines with a classic distribution. The paylines are not fixed and there is a button to control them. This means that the players can set the gameplay at any number of paylines between 1 and 10. However, playing all the lines on the maximum bet could lead to a win of over 500x the stake.

Play Book of Oil Payouts

In the top right corner, you will notice an “i” button where all the payouts are revealed. Here are the highest paylines that each symbol line can offer. Play Book of Oil and you will understand them all really quickly.

Play Book of Oil Payouts

Play Book of Oil Features and Bonuses

As we mentioned a couple of times in this review, Book of Oil is just another clone of the well-known Book of Ra title from Novomatic. For that reason, players should already know all the mechanics of this title, including the bonus features that it comes with. There are lots of slot titles out there that follow the same route. The mechanics are identical and the only thing that’s changed is the theme and the design of the game. In this Endorphina title, the book symbol is both the wild and the scatter. As a wild it substitutes for symbols and as a scatter its used to trigger the free spins mode. Additionally, we have to mention the fact that Book of Oil has a gamble feature as well where players can double their wins. Play Book of Oil and take advantage of these features.


The book symbol is the most important symbol in this game. It acts as both the wild and the scatter of this title. As a wild, it has a very simple job. Its used to substitute for other symbols to create wins. The only symbol it can’t substitute is the special expanding symbol that appears during the free spins feature. However, more about that below. As a scatter, the book symbol is used to trigger the most important feature of the game, the free spins round. We will explain that feature in detail in our Thrill Factor section below.

Wild Feature
Wild Feature

Play Book of Oil Gamble Feature

Like many other casino games, this one also has a Gamble feature. Here, you will get one card shown, and 4 more flipped over face down. You need to choose one of the remaining four cards. If the card you choose is highest than the dealer’s, you win, if the dealer’s card is higher than yours, you will lose and will be taken back to the base game. If the card is the same as the dealer’s you will repeat the round. You can choose to collect your winnings after each high card chosen. In Book of Oil, you can double your winning up to 10 times. However, once you get it wrong, the round is over and you lose your initial win. Endorphina as a developer often add gamble features to their slots. Play Book of Oil and double your winnings as much as possible.

Play Book of Oil Gamble Feature
Gamble Feature

Free Spins Feature

There is one more feature that the Book of Oil slot has and we have to mention it. It’s a feature that’s part of the regular gameplay which is why we consider it the Thrill factor. It’s a free spins feature which is favorite among players. Below, we will explain this feature in detail.

Landing 3 or more Scatters on the reels will not only get you Scatter wins, but it will also trigger a bonus round that will award you 10 spins and a special Expanding symbol. At the start of the round, a symbol that will be expanded is going to be randomly chosen. When enough symbols of the select kind are present to complete a win line, all such symbols will expand and cover the reel that they appear on. Special symbols expand after the payout of regular symbols, and expanded symbols pay for combo of a kind in adjacent and non-adjacent positions, and only on active paylines, of course. The feature can be retriggered and spins will be re-awarded. Play Book of Oil and win as many free spins as possible.

Free Spins Feature
Free Spins Feature

Last but not least, we have to mention that the book symbol in Book of Oil has a nice paytable as well. It’s one of the highest-paying symbols in the game, second only to the oil tycoon symbol. If you get 3, 4, or 5 book symbols on the reels, not only will you get free spins but a payout of 2, 20, or 200x the stake will happen as well.

For more bonuses and additional slots check out our Bitcoin Slots.

Game info

Provider Endorphina
Category Slots