Spinomenal

Book of Skulls

RARE Slots Video Slots Horror Pirate Action & Adventure Book Sea

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

Only 0.1% of slots combine Book Of... and Cheats Tool.

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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

93.96%

return to player

Volatility

—

variance

Max win

5,000×

top multiplier

Min bet

$0.10

per spin

Reels

10 lines

Player rating

4.0 ★

2 votes

DEMO Play free, no signup

Spinomenal

4.0 / 5

2 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 & RTP5/10

RTP 93.96% → 5.0/10

Volatility8/10imputed

imputed medium (unknown) → 8.0/10

Win Potential7.4/10

x5000.00 (5000×) → 7.4/10

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 Flexibility6/10

0.1–100 (×1000) → 6.0/10

Provider Reputation5.7/10

provider avg 5.7 → 5.7/10

Popularity2.5/10

synthetic proxy → 2.5/10

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: 55 — Book of Skulls by Spinomenal

https://slotranker.com/spinomenal/book-of-skulls#score

How to cite

Spec sheet

Book of Skulls at a glance.

Identity

Slot nameBook of Skulls

StudioSpinomenal

Released8/26/2021

Math

SlotRanker Score55

RTP93.96%

Max win5,000×

Bet range$0.10 – $100.00

Player rating4.0 / 5 · 2 votes

Format

Reels5

Paylines10

Layout5x3

Features

Themes

Expected average based on this slot's 93.96% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$2.42

Cost per session$2.42

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 Skulls? 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: Mediumassumed — not published for this slot

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 (93.96%), with wins capped at its top multiplier (5,000×).

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 Skulls with other games

	Book of Skulls Score 55This game	Book of Blackeye’s Bounty Score 78	The Black Book of Pirates Score 75	Book of Rrrum Score 74	Tome of the Lost Score 73
Identity
Studio	Spinomenal	Indigo Magic	Apparat Gaming	Esa Gaming	Play'n Go
Released	8/26/2021	8/24/2023	10/12/2022	10/21/2024	2/24/2025
Math
RTP	93.96%	96.04%	96.14%	96%	96%
Volatility	—	High volatility	High volatility	Medium/High	High volatility
Max win	5,000×	8,000×	5,000×	7,000×	2,000×
Format
Reels	5	5	5	5	6
Layout	5x3	5x3	5x3	5x3	6x5
Paylines	10	10	10	10	Cluster Pays
Min bet	0.10	0.10	0.10	0.02	0.10
Max bet	100.00	100.00	100.00	100.00	100.00
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	—	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	—	—	✓	—
Bonus game	—	—	✓	—	—
Respins	—	—	✓	—	—

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

Comparing against

Book of Skulls

Spinomenal

RTP

93.96%

Max win

5,000×

Score

Book of Blackeye’s Bounty

The Black Book of Pirates

+ Bonus Game+ Respins

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