| Where to Play? | 1st Deposit Bonus | Compatible Devices | |
|---|---|---|---|
 | 100% up to €500 + 100 Free Spins | Play Now | |
 | 100% up to $1000 + 100 Free Spins | Play Now | |
 | 200% Up to $2000 + 100 Free Spins | Play Now | |
 | 200% up to €1000 + 100 Free Spins | Play Now |
Book of Oil Slot by Endorphina is a striking online video slot with a bold oil‑tycoon theme.
Set across a classic 5‑reel, 3‑row layout with 10 adjustable paylines, this medium‑variance slot delivers balanced gameplay with high return potential. With an official RTP of 96.05 %, Book of Oil offers competitive payout rates in its genre.
Oil Theme & Graphics
The oil theme of Book of Oil is immersive, featuring symbols such as oil pumpjacks, barrels, stacks of cash and the oil baron himself. The background evokes sun‑baked desert rigs and modern agrarian skylines.
Card royals from Ten to Ace round out the symbol set. The audiovisual presentation combines atmospheric graphics with a funky electronic melody and woodwind accompaniment to reinforce the high‑stakes energy vibe.
Betting Range & Paytable
Players can bet from as low as €0.01 per payline up to €100 total on all 10 lines. High‑value symbol payouts include up to 5000× stake for five oil‑man symbols, 2000× for pumpjack, and 750× for barrels or cash stacks. The lower‑value A and K pay 150×, while Q, J and 10 yield 100× for five‑symbol combinations.
RTP & Volatility
Endorphina designed Book of Oil with a typical Return to Player of 96.05 %, while its volatility falls squarely in the medium risk category. This means players can expect a mix of moderately frequent wins and significant payout swings—ideal for those who seek balanced gameplay without excessive gamble streaks.
Wild & Scatter Symbol with Expanding Features
A purple and gold book symbol serves dual functions: as a wild, it substitutes for all standard symbols, and as a scatter, it triggers the free spins bonus when three or more appear anywhere on the reels.
During free spins, a randomly selected symbol becomes the expanding symbol. Whenever enough of that symbol appear, they expand to fill entire reels, potentially delivering massive wins regardless of position on the paylines.
Free Spins Feature & Bonus Pop
Landing three or more book scatters awards 10 free spins. At the start of the free spins round, one symbol is chosen at random as the expanding symbol.
All placements of this symbol count toward triggering expansion. Additionally, players may take advantage of a Bonus Pop buy‑feature, allowing direct access to free spins with a chosen expanding symbol at a price calculated relative to their stake (availability depending on casino jurisdiction).
Gamble Feature
Book of Oil Slot includes a classic gamble (double) feature activated after any win. Players can attempt to double their payout up to 10 consecutive times by selecting one of four face‑down cards to beat the dealer. The feature adds an element of risk and strategy, allowing for significantly increased wins when successful, though all gains may be lost on a wrong guess.
Mobile Compatibility
Built in HTML5, Book of Oil is fully compatible with modern desktop, tablet and mobile browsers on both Android and iOS devices. Gameplay, animations and features remain consistent across devices, ensuring seamless slot sessions on the go.
Why Play Book of Oil Slot
Book of Oil Slot by Endorphina stands out with its unique oil‑baron theme and classic Book‑style mechanics. With an RTP of 96.05 %, medium volatility, free spins with expanding symbols, and a gamble option, it suits both casual players and those chasing bigger wins.
Whether trying the demo mode or betting real money, the customizable paylines and Bonus Pop feature add flexibility and excitement.
