Book of Oil

Book of Oil Slot Review

The Book of Oil online slot features a traditional 5-reel, 3-row layout with 10 fixed paylines, offering players a familiar gaming structure with industrial flair. The slot boasts an RTP of 96.05% and high volatility, making it perfect for players who enjoy the thrill of potentially significant wins. With its industrial theme, detailed graphics, and expanding symbol feature, Book of Oil stands out as one of Endorphina’s most distinctive adventure-themed slots.

In the base game, winning combinations are formed from left to right on active paylines. The game features both low-paying card symbols and high-paying industrial symbols that bring the energy theme to life. The Book of Oil symbol serves as both the wild and scatter, triggering free spins and substituting for other symbols to create winning combinations.

Main Info

Features and Mechanics of the Book of Oil Slot

Design and Interface

The theme of the slot machine is the oil industry and the world of wealthy magnates, with black and various shades of gold dominating the design. The reels, framed by luxurious golden elements, are set against a backdrop of oil derricks under a gleaming sky.

All the details of the slot machine’s design are well thought out, and even the smallest elements fit into the overall concept. The icons come to life when winning combinations are formed, and the reels are accompanied by majestic music.

As for the slot interface, it gives players a wide range of options for customising the game to their liking. Here, you can set the bet level on the panel at the bottom and change the coin denomination in the upper left corner of the screen, enable or disable autoplay, and set turbo mode. The tabs, which are accessed by clicking on the button with three horizontal lines symbolising the menu list, provide access to help, statistics, advanced autoplay settings, graphics quality switching, music and language settings.

Symbols

The main symbols in the slot are two types of images: characters and objects from the oil industry. The Oil Tycoon is the highest-paying regular symbol. The game also features oil derricks, storage tanks, and oil barrels. The regular symbols are card values 10, J, Q, K, A, styled in a golden design.

Scatter+Wild Symbol – Book of Oil

The Book is a special symbol. It acts as both a classic Wild (replacing all symbols on the field) and a Scatter (triggering a bonus game and forming winning combinations itself). Combos of 3, 4, or 5 Scatter symbols are paid based on the cost of the spin. Three symbols anywhere on the playing field increase the total bet by 2 times, four by 20 times, and five by 200 times. Combinations of standard symbols have a coefficient that is applied to the line bet.

Paytable

Bonus Game

The secret to the slot’s popularity lies in its unusual implementation of payouts in free spins mode, which are triggered when three or more Scatter symbols are collected. The number of spins is always the same – 10 free spins. The mode begins with an animation during which a special expanding symbol is randomly selected.

The special feature of prize spins is that when any winning chain is formed, even if it appears on a non-activated line, the corresponding symbols expand to the full height of the reels. In this mode, the chance of completely filling the field with identical symbols increases dramatically. At the same time, payouts are made on the lines that were active before the start of the bonus game.

During free spins, the Wild symbol (Book) cannot substitute for the special expanding symbol. If 3 or more Books appear during the bonus, you receive an additional 10 free spins.

Bonus Buy Function

For players who prefer to skip the wait and dive straight into the action, Book of Oil offers a Bonus Buy feature. This allows you to purchase instant access to the Free Spins round without having to land three Scatter symbols naturally.

The Bonus Buy function may not be available at all online casinos due to regional gambling regulations. Some countries, including the UK, have restrictions on bonus purchase features. Always check availability at your chosen casino before planning your strategy around this feature.

Risk Game

After every win in the base game of Book of Oil, you’re presented with a tempting opportunity – to test your fate in a classic card showdown against the dealer. It’s essentially a “double or nothing” gamble that can transform a modest win into a substantial payout or wipe it out entirely.

How the card duel works:

Five cards are laid out face-down before you. The dealer reveals their card first – now you know what “bar” you need to clear. Your task is simple in words but nerve-wracking in practice: pick one of the remaining four cards that ranks higher than the dealer’s.

• Your card is higher – winnings double
• Your card is lower – winnings are lost
• Cards are equal – tie, you can try again

The Mathematics of Risk:

It’s crucial to understand that the risk game isn’t a 50/50 roulette spin. Its average return sits around 84%.

Mobile Compatibility

Book of Oil was developed using cutting-edge HTML5 technology, ensuring flawless performance across all modern devices. Whether you’re chasing black gold on your morning commute or relaxing at home, the slot adapts seamlessly to your screen.

Cross-Platform Excellence:

Endorphina has optimized Book of Oil for a truly universal gaming experience:

• Smartphones – iPhone (iOS 12+), Android devices (Android 6.0+)
• Tablets – iPad, Samsung Galaxy Tab, and other popular models
• Desktop – Windows, macOS, Linux via any modern browser

Conclusion about the Book of Oil Online Slot

Every player should definitely try Endorphina’s Book of Oil slot. Since the slot is highly volatile, it is important to set a limit on the game in advance to control your spending.

Bonus spins and the risk game are excellent opportunities to increase your winnings, so it is worth actively using them when they appear. Beginners are advised to start with the demo version of the game to better understand the mechanics and features of the bonuses without risking real money. You can play it on both your computer and mobile devices.

Once you have figured out all the intricacies of the gameplay, every gambler can try their luck by launching this atmospheric and luxurious game at the best online casinos.