Book of Oil Review Scores

Game title: Book of Oil

Game description: Book of Oil is a fantastic Endorphina slot that comes with a oil theme and a simple gameplay. It has a special symbol that counts as both a wild and a scatter. The latter one is used to trigger the Free Spins feature. Players can enjoy a gamble feature as well.

Play Book of Oil

  • Graphics & Sound
  • Gameplay
  • Features & Bonuses
  • Free Spins
  • Thrill Factor


  • Great Graphics
  • Free Spins
  • High Payouts


Welcome to yet another “Book of Ra” clone that comes from Endorphina. 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. Keep reading to learn everything you need to know about this fantastic slot title.

Welcome to Book of Oil
Welcome to Book of Oil

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 while the maximum payout is 500x the stake.

Book of Santa Gameplay

Before starting Book of Oil there are certain things you can do to set it up under your preferences. You can see the betting amount right below the reels. You can set it from 10 to 100.00 coins per spin. However, the player can also control the coin size. It can be set at 0.05, 0.1, 0.2 or 0.5. Conversely, the maximum bet with a 0.5 coin size is 500.00 coins per spin. The slot has 10 paylines that can be controlled by the Lines button in the bottom left corner. This means that players can set their gameplay anywhere from 1 to 10 paylines. Keep in mind that this slot can be played with bitcoin. However, you can play with regular FIAT currency as well.


Hitting the Spin button will start the Book of Oil online slot. The button is on the bottom right side, right below the reels. Right next to it, you can see the Auto button which is used to spin the reels automatically. This is a feature often added to slots by game developers. Additionally, this slot title has a turbo button as well. Clicking on it will make the reels spin faster, creating a faster gameplay. The button to control the background sound is on the top-right side of the reels. Right next to it, there is an “i” button. Clicking on it will reveal the gameplay, paylines, and all the bonuses. However, the game options are set diagonally from the background sounds button. You can find them in the bottom left corner.


Before we talk about the symbols, we have to give praise to the developer for the visual approach they took with Book of Oil. The slot looks great as it gives players an opportunity to see what an oil reservoir looks like. The game also has all the elements that a person would need to perform an oil extraction. Furthermore, the symbols follow the oil theme as all of them are somewhat connected. First, the highest-paying symbol is the boss himself, the oil tycoon and he pays 500x the stake. The other lucrative symbols include an oil derrick, some oil tanks, and stacks of money.

We can put the book symbol in this category as well. It has a big paytable and its also both the wild and the scatter symbol of the game. As a scatter, the book is used to trigger free spins. Last but not least, like most Endorphina titles, the regular royal symbols are present. There are five of them including the letters A, K, Q, J, as well as the number 10. Below, we will talk more about the bonus features of this title.

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. Keep reading to learn more about these bonus 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

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. You can read more about such features on their website.

Book of Oil Gamble Feature
Gamble Feature

Thrill Factor

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.

Free Spins Feature

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.

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.


To conclude, what we have here is another slot that is based on the well-known “Book of Ra” title. However, Endorphina thought of a nice theme here as they incorporated the oil element into the Book of Oil slot title. The graphics are modern and the sounds are excellent, especially the effects. When it comes to bonus features, there is nothing we haven’t seen before. The book symbol is both the wild and the scatter. It triggers free spins which is the best feature in the game. There is a gamble feature as well which players can use to double their wins up to 10 times. The RTP of the game is around 96% which is the industry average. At the maximum bet, a player can win up to $50,000 or 500x the stake. To achieve this, you would need 5 of the oil tycoon symbols.

Play the Book of Oil slot on our Bitcoin Casino.

Please, also read our review on Endorphina’s Book of Santa Slot.