

This Book of Oil slot review drills into a high-stakes world. Developer Endorphina created a place where you can strike black gold. Furthermore, this video slot uses a popular ‘Book of’ mechanic. The Book symbol acts as both a Wild and a Scatter. Consequently, it unlocks the game’s biggest feature.
The game also offers a Free Games round. This feature includes a special expanding symbol. The slot has a solid RTP of 96.05%. However, the developer has not specified a maximum win. The high volatility still suggests huge payout potential. In short, this Book of Oil Endorphina title promises a thrilling adventure.
Book of Oil features a rich and opulent theme. For instance, the background shows golden oil rivers and tall derricks. The game’s main symbols reinforce this wealthy feel. You will see a confident Oil Tycoon and gleaming oil barrels. You will also find industrial drilling equipment on the reels.
In addition, the sound design enhances the user experience. The industrial sound effects are very engaging. They reinforce the theme with every single spin. Moreover, crisp graphics and smooth animations give a premium feel. Ultimately, this detailed design gives Book of Oil a powerful identity.
Players can play Book of Oil on a simple grid. The game uses a 5×3 reel layout. Furthermore, it has 10 adjustable paylines. This allows players to customize their risk. You can also adjust your betting strategy. The game’s betting range is quite wide.
For example, bets start at just €0.01. They go all the way up to €100. Consequently, this range suits all types of players. The game also has a 96.05% RTP. Its high volatility means fewer but larger wins. Therefore, bankroll management is very important. These mechanics create a thrilling gameplay loop.
This title does not have a cascading wins feature. Instead, the gameplay focuses on its main bonus. Landing 3 or more Book symbols triggers 10 Free Games. This is the heart of the Book of Oil bonuses. Before the round starts, the game chooses a random symbol to expand.
This special symbol covers its entire reel. In addition, it pays on all 10 lines. It pays even on non-adjacent reels. The game also includes an optional Gamble feature. Here, players can try to double any win up to 10 times. Moreover, some players can use the Bonus Pop feature. This availability depends on rules from bodies like the Gibraltar Regulatory Authority. This feature lets you buy direct entry into the free spins. The features combine to make the gameplay exceptionally thrilling.
The Book of Oil Endorphina slot has hard volatility. This high-risk profile demands patience from players. Therefore, you should have a solid bankroll strategy. You may face dry spells between big wins. If you feel your play is becoming a problem, support is available. For instance, you can call the 1-800-GAMBLER (US Helpline) for confidential help.
Official data on hit frequency is not available. Similarly, the developer does not list the bonus trigger rate. The company also has not specified a maximum win cap. This may be a drawback for some players. However, the game’s mechanics imply a very high ceiling. The game’s payout profile is made for thrill-seekers.
This Book of Oil (Endorphina) review notes its unique theme. It is not a sequel to another game. Instead, it offers a fresh take on a classic genre. The oil industry theme is a big change. Most ‘Book of’ slots use an ancient Egypt setting. This game shares its core DNA with those classics, though.
For instance, it has a dual-function Wild/Scatter symbol. It also features the famous free spins with an expanding symbol. Its theme feels more grounded than fantastical slots like Sugar Glider. It also avoids the flashy neon aesthetic of games like Lights. In addition, the Bonus Pop feature is a modern innovation. It feels as current as the prizes in Dream Car Urban. Consequently, Book of Oil stands out in a crowded category.
Endorphina ensures a seamless experience on all devices. For example, mobile gameplay is fully optimized. The user interface is clean and touch-friendly. It also works perfectly in portrait or landscape mode. Therefore, you can easily play Book of Oil anywhere.
The desktop version is also excellent. The larger screen allows the detailed graphics to shine. All game controls are easily accessible. Furthermore, the game’s performance is identical across platforms. The features, gameplay, and RTP remain the same. Endorphina delivers a polished and reliable cross-platform experience.
The gameplay in the Book of Oil slot creates a cycle of anticipation. The base game slowly builds tension. The Free Games feature then releases that tension. This bonus round is fast-paced and very exciting. Wins can stack up rapidly with the expanding symbol.
The high volatility creates a compelling chase for the bonus. Consequently, the balance of risk and reward feels sharp. Players have a real shot at huge wins. However, you must have a budget for the dry spells. Overall, Book of Oil offers a high-octane and rewarding player experience.
This Book of Oil slot review found many strong points. The game has several great highlights. However, it also has a few downsides.
There are some potential drawbacks to consider.
This is a top-tier version of the ‘Book of’ formula. The unique theme is engaging. Therefore, we highly recommend Book of Oil to fans of high-volatility slots. It is also great for players wanting a fresh take on a classic. If you have patience for high-risk gameplay, this slot could be a gusher.
The Book of Oil slot by Endorphina has a Return to Player (RTP) of 96.05%, which is considered solid for an online slot.
The main feature is the Free Games round, which is triggered by landing three or more Book symbols. Before the 10 free spins begin, a special symbol is randomly chosen to expand and cover entire reels, paying on all active paylines regardless of position.
Yes, Book of Oil has high volatility. This means that wins may be less frequent, but they have the potential to be much larger. Players should manage their bankroll accordingly.
Yes, the game includes a Bonus Pop feature that allows players to buy direct entry into the Free Games round. However, the availability of this feature depends on the player’s jurisdiction and local regulations.