Play the Book of Oil slot machine for free
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Slot machine details and review Book of Oil
Endorphinaβs list of Book-style slots includes several titles that are unique, and one great example is Book of Oil. Itβs an oil-themed slot, so youβre looking at oil rigs and other related graphics, an overall interesting choice in this particular category. Gameplay-wise, itβs similar to what you will find in other 5-reel slots of this type, giving you 3 rows of symbols and 10 paylines.
Author:
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Slot machine detail:
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Software providerWho is the Software provider of the slot machine?
Every slot machine must be developed by a company that invented, designed and put it into operation. Many players eventually find that they only enjoy playing on machines from specific software provider, so they narrow down their selection by preferred brand.
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Game typeSlot -
Reels -
Winning paylines10 paylines -
Themes
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VolatilityHigh
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Maximum win5 555
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Layout5x3
The volatility of this slot
Low
Low-Medium
Medium
Medium-High
High
A high volatility slot. Wins are rare, but can be really big. The game has more pronounced fluctuations and can often go without hitting anything for a long time, suitable for players who like adrenaline, higher risk and work with a larger budget. More about volatility here.
Slot theme and symbols
Visually, itβs not the most attractive slot around, but itβs understandable, given the chosen theme, inspired by the oil extraction industry. Oil rigs are a dirty business, but itβs still a unique choice, and you donβt get it anywhere else. The symbols are split between colourful Royals and images of various related imagery, such as rigs, oil barrels, or stacks of cash. Itβs not winning prizes for design quality, thatβs for sure.
For the most part, the offer of this Endorphina slot machine is similar to that of other Book slots, particularly in terms of features and High volatility. RTP-wise, itβs fair, at 96.05%, but Iβve seen plenty of Book slots go even higher with the long-term returns. Where it does a little better than some competitors is in the potential to pay up to 5,555x the stake.
Business Man
Oil Rig
Oil Barrel
Cash
Letter A
Letter K
Letter Q
Letter J
Number 10
Special Symbols and Slot Features
3D
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NO |
Autoplay
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YES |
Free Spins
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YES |
Gamble Feature
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YES |
Locking Symbols
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NO |
Wild Symbol
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YES |
Win Multiplier
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NO |
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Other features
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Bonus buy
Other Features
Scatter Symbol
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WILD symbol
The star of the slotβs reels is the Book of Oil. Itβs the gameβs only feature symbol, which will be used both as a wild and a scatter. This means that it can land anywhere on the reels and get you paid directly (up to 200x) or trigger the main feature. It can also be used as a replacement symbol if it lands in the right place to be of help.
Free Spins
Whenever you get 3 to 5 scatter symbols at the same time, the game will trigger 10 free spins. Itβs a feature thatβs played with a special symbol, which the game selects at random from the list of regular symbols. That symbol gains the ability to expand on the reels it lands on. It can also form combinations through reels that are not adjacent, on all paylines. As long as you have the 2+ or 3+ reels with matching symbols of that type, you get paid. Itβs possible to retrigger the free spins feature if you can get another 3+ scatters.
Risk Game (Gamble)
You have the option to gamble winnings after every winning spin. The gamble may result in a loss, or you can double that money. You just have to get a better card than the Dealerβs to be successful. You can do this up to 10 times if you keep being successful.
Bonus Pop Buy
One very interesting option is Bonus Pop. Use it to buy access to 10 free spins. Whatβs interesting is that you can pick the symbol that will be special. The amount required varies from 69x to 133x the stake, based on the chosen symbol.
Prize table
| Symbol | Multiplier | |||
|---|---|---|---|---|
| 2x in payline | 3x in payline | 4x in payline | 5x in payline | |
WILD symbol
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2x | 20x | 200x | |
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Business Man
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1x | 10x | 100x | 500x |
|
Oil Rig
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0.50x | 4x | 40x | 200x |
|
Oil Barrel
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0.50x | 3x | 10x | 75x |
|
Cash
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0.50x | 3x | 10x | 75x |
|
Letter A
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0.50x | 4x | 15x | |
|
Letter K
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0.50x | 4x | 15x | |
|
Letter Q
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0.50x | 2.50x | 10x | |
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Letter J
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0.50x | 2.50x | 10x | |
|
Number 10
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0.50x | 2.50x | 10x | |
Our rating of the game Book of Oil
Book of Oil doesnβt give you new mechanics or significantly larger prizes than the competition, but it does have a different theme, and so visually it will be something new for you to explore. The same high volatility, together with a 96.05% RTP and a 5,555x top jackpot, are found inside, as you would in most other Book slots. Itβs not a visually appealing slot, despite the new theme, given the connection to the oil extraction industry. Itβs an OK option for someone who enjoys Book slots.
rating
Manufacturer Endorphina
Endorphina is a Prague-based online casino software developer founded in 2012, known for creating visually stunning and mathematically balanced slot games. π° The company combines classic slot mechanics with innovative features and engaging storylines, appealing to both traditional and modern players. Endorphinaβs portfolio includes popular titles like Book of Vlad, Hell Hot 100, and Chance Machine 40, all designed in HTML5 for seamless play across devices. Licensed and regulated by reputable authorities, Endorphina continues to stand out in the iGaming world for its creativity, reliability, and focus on player experience.
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Rating
18+. New Players Only. Β£10 minimum deposit. 100% up to a maximum of Β£200. The welcome offer can be activated only once. 30 calendar days to activate. 35x wagering. 60 calendar days from activation to complete wagering. The 100% bonus up to Β£200 will be paid out in 10% increments to your Main Account balance. Bonus balance is not payable. Any remaining bonus balance will be forfeited upon withdrawal. T&Cs Apply. GambleAware.org
Rating
18+. New players only. Min dep. Β£20. Valid for 14 days from registration. Welcome Offer: Earn points for cash bets made to unlock wager-free spins on selected games: 2 points for every Β£10 bet on Slots, 1 point for every Β£10 bet on Video Poker and qualifying Side Bets. 0.25 points for every Β£10 bet on Roulette games. Maximum accumulation of redeemable points is limited to 2000. You will receive spins based on the number of points earned:10, 20, 35, 50 points = 5 spins, 70 points = 1 Superspin, 100 points = 10 spins, 200 points = 5 Superspins, 300 points = 4 Superspins, 500 points = 6 Superspins. Additionally you will earn an extra 120 Spins for every 375 points earned above the 500-point threshold, until you reach a total of 2000 points. Spins credited the next day. Spin winnings credited as cash funds and capped at Β£100 per batch of spins. Cash funds are immediately withdrawable. Wager-free spins must be used within 72 hours. Terms Apply. BeGambleAware.org.
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18+. New Players Only. Β£10 minimum deposit. 100% up to a maximum of Β£200. The welcome offer can be activated only once. 30 calendar days to activate. 35x wagering. 60 calendar days from activation to complete wagering. The 100% bonus up to Β£200 will be paid out in 10% increments to your Main Account balance. Bonus balance is not payable. Any remaining bonus balance will be forfeited upon withdrawal. T&Cs Apply. GambleAware.org
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