Endorphina

Book of Oil

RARE Slots Video Slots Business Industry

Play Book of Oil slot by Endorphina for free in demo mode! Explore RTP, bonus rounds, and key features before playing for real.

Only 0.7% of slots combine Additional Free Spins and Gamble.

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals or paid placement.

How this score is built

RTP

96.05%

return to player

Volatility

Medium volatility

variance

Max win

—

top multiplier

Min bet

$0.01

per spin

Reels

10 lines

Player rating

4.5 ★

3 votes

DEMO Play free, no signup

Endorphina

Embed on your site

4.5 / 5

3 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP9/10

RTP 96.05% → 9.0/10

Volatility8/10

medium → 8.0/10

Win Potential—

no data

Features7/10

11 features → 7.0/10

Game Mechanics4.2/10

f=11 r=5 p=10 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility8/10

0.01–50 (×5000) → 8.0/10

Provider Reputation6.6/10

provider avg 6.6 → 6.6/10

Popularity6.7/10

synthetic proxy → 6.7/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 73 — Book of Oil by Endorphina

https://slotranker.com/endorphina/book-of-oil#score

How to cite

Spec sheet

Book of Oil at a glance.

Identity

Slot nameBook of Oil

StudioEndorphina

Released9/17/2021

Math

SlotRanker Score73

RTP96.05%

VolatilityMedium volatility

Max win—

Bet range$0.01 – $50.00

Player rating4.5 / 5 · 3 votes

Format

Reels5

Paylines10

Layout5x3

Features

Themes

Expected average based on this slot's 96.05% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$0.16

Cost per session$0.16

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Book of Oil? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: Medium

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (Medium). The model is calibrated so the average return equals this slot's published RTP (96.05%), with wins capped at its top multiplier (1,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Compare Book of Oil with other games

	Book of Oil Score 73This game	Outsourced Score 81	Texan Tycoon Score 65	Labour Day Score 63	Slot Factory Score 61
Identity
Studio	Endorphina	NoLimit City	Realtime Gaming	Onlyplay	Slot Factory
Released	9/17/2021	8/6/2024	4/26/2010	4/30/2024	7/13/2023
Math
RTP	96.05%	96.08%	—	95%	96%
Volatility	Medium volatility	High volatility	High volatility	Medium volatility	Low/Medium
Max win	—	5,000×	—	4,103×	—
Format
Reels	5	5	5	5	5
Layout	5x3	5x3	5x3	5x3	5x3
Paylines	10	256	25	5	15
Min bet	0.01	0.2	0.25	0.1	0.15
Max bet	50	5	125	50	45
Features
Progressive	—	—	✓	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	—	✓
Scatter symbol	✓	✓	✓	—	—
Multiplier	—	✓	✓	✓	—
Bonus game	—	—	—	✓	✓
Respins	—	—	—	✓	—

Every number is shown as a delta against Book of Oil.

Comparing against

Book of Oil

Endorphina

RTP

96.05%

Max win

—

Score

+ Progressive+ Multiplier

+ Multiplier+ Bonus Game+ Respins− Free Spins− Scatter

+ Bonus Game− Scatter

Explore More Games with Similar RTP

	Provider	RTP	Volatility	Max win	Score
Candyways Bonanza 3	StakeLogic	96.01%	High volatility	20,000×	88
Zombie aPOPalypse MultiPop	AvatarUX	96.01%	High volatility	20,000×	87
5 Clans	Reflex Gaming	96.02%	High volatility	27,471×	86
Queen of Wonderland Megaways	iSoftbet	96.03%	High volatility	50,000×	88
Crystal Prince	Quickspin	96.04%	High volatility	11,630×	87
Book of Oil	Endorphina	96.05%	Medium volatility	—	73
Nugget	AvatarUX	96.05%	High volatility	25,000×	88
Monkey Bonanza	Northern Lights Gaming	96.06%	High volatility	52,000×	87
Olympus Raging Megaways	iSoftbet	96.07%	High volatility	25,000×	88
JunglePop	AvatarUX	96.08%	High volatility	50,000×	88
Gluttony	NoLimit City	96.09%	High volatility	32,000×	88