Endorphina

Book of Lady

Slots Video Slots Fantasy Mystery Book Animals Luxury Female

International Women's Day variation on the expanding-symbol Book format

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

96.03%

return to player

Volatility

Medium volatility

variance

Max win

—

top multiplier

Min bet

$0.01

per spin

Reels

10 lines

Player rating

4.6 ★

17 votes

DEMO Play free, no signup

Endorphina

Embed on your site

4.6 / 5

17 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 96.03% → 9.0/10

Volatility8/10

medium → 8.0/10

Win Potential—

no data

Features7.5/10

12 features → 7.5/10

Game Mechanics4.2/10

f=12 r=5 p=10 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility8/10

0.01–100 (×10000) → 8.0/10

Provider Reputation6.6/10

provider avg 6.6 → 6.6/10

Popularity3.3/10

synthetic proxy → 3.3/10

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: 68 — Book of Lady by Endorphina

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

How to cite

Slot Summary

Land three Book symbols and Book of Lady turns its familiar 5x3 line game into 10 Free Spins with a randomly chosen Expanding Symbol. Retriggers add another expanding choice, so the round can broaden beyond its first selection. Endorphina pairs that established Book Of structure with an International Women's Day theme, a 96.03% RTP, medium volatility, and an optional Gamble decision after wins.

How It Plays

Wins form across 10 paylines on the 5x3 field, starting from the left. The Book substitutes for regular symbols and also pays as a Scatter.

After an ordinary win, the optional Gamble game presents one visible dealer card and four face-down choices. A higher selection wins; a lower card loses the risked amount.

Theme & Atmosphere

Book of Lady was released by Endorphina in connection with International Women's Day, giving the conventional Book theme a specifically female and celebratory subject.

Luxury fashion objects, a woman, and a cat carry the Female and Animals themes. The tone is polished and playful rather than archaeological or adventure-led.

Fantasy Mystery Book Animals Luxury Female

Features & Win Potential

The Book is both Wild and Scatter, but it cannot replace the selected Expanding Symbol during Free Spins. That separation keeps their functions distinct.

The Risk/Gamble Double game follows eligible wins and uses a higher-card choice. Players may collect instead of continuing to expose the result to another decision.

Free Spins Scatter Symbol Wild Symbol Medium volatility 5 Reels Gamble Book Of...Additional Free Spins Expanding Symbols 10 Paylines 96% RTP Risk/Gamble (Double) game

Bonus & Free Spins

Three Book Scatters award 10 Free Spins. Before the round starts, one of the nine regular symbols is randomly selected as the special Expanding Symbol.

A retrigger supplies 10 more spins and chooses an additional Expanding Symbol. Selected symbols expand over complete reels whenever their expansion can form a win.

Spec sheet

Book of Lady at a glance.

Identity

Slot nameBook of Lady

StudioEndorphina

Released3/3/2022

Math

SlotRanker Score68

RTP96.03%

VolatilityMedium volatility

Max win—

Bet range$0.01 – $100.00

Player rating4.6 / 5 · 17 votes

Format

Reels5

Paylines10

Layout5x3

Features

Themes

Expected average based on this slot's 96.03% 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 Lady? 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 (96.03%), 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.

Where to play Book of Lady

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Compare Book of Lady with other games

	Book of Lady Score 68This game	Plunderland Score 85	Glamour Crocodile Score 75	Moon Spell Score 74	The Catfather Score 68
Identity
Studio	Endorphina	Relax Gaming	Onlyplay	Red Tiger Gaming	Pragmatic Play
Released	3/3/2022	1/11/2022	9/19/2024	10/17/2024	3/15/2016
Math
RTP	96.03%	96.43%	95.5%	95.76%	96.52%
Volatility	Medium volatility	High volatility	High volatility	High volatility	—
Max win	—	10,266×	21,130×	5,224×	—
Format
Reels	5	7	5	5	5
Layout	5x3	7x7	5x3	5x3	5x3
Paylines	10	7	10	20	9
Min bet	0.01	0.1	0.1	0.1	0.9
Max bet	100	100	50	10	45
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	—	✓
Scatter symbol	✓	✓	✓	—	✓
Multiplier	—	✓	✓	✓	—
Bonus game	—	—	✓	✓	—
Respins	—	—	—	✓	—

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

Comparing against

Book of Lady

Endorphina

RTP

96.03%

Max win

—

Score

+ Multiplier+ Bonus Game

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

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01What triggers Free Spins in Book of Lady?

Landing three Book Scatter symbols on one spin awards 10 Free Spins and randomly chooses one regular symbol to become the Expanding Symbol.

02Can the Free Spins feature retrigger?

Yes. Another three Book symbols award 10 additional spins and select another Expanding Symbol, with as many as nine regular symbols becoming eligible.

03What does the Book symbol do?

The Book serves as both the Wild Symbol and Scatter Symbol. It substitutes for ordinary symbols in base play and activates Free Spins when enough land.

04Does Book of Lady include a Gamble feature?

Yes. After a qualifying win, the card-based Gamble option allows the result to be risked on choosing a card higher than the dealer's visible card.

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