Thunderspin

Book of Jam

Slots Video Slots Nature Fruit Book Star Sea Classic

Fruit-themed Book slot with a bonus inside Free Spins

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

95.9%

return to player

Volatility

High volatility

variance

Max win

1,000×

top multiplier

Min bet

$0.01

per spin

Reels

10 lines

Player rating

3.6 ★

3 votes

DEMO Play free, no signup

Thunderspin

Embed on your site

3.6 / 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 & RTP8/10

RTP 95.9% → 8.0/10

Volatility9/10

high → 9.0/10

Win Potential6/10

x1000.00 (1000×) → 6.0/10

Features10/10

16 features → 10.0/10

Game Mechanics5.9/10

f=16 r=5 p=10 → 5.9/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility8/10

0.01–100 (×10000) → 8.0/10

Provider Reputation6.8/10

provider avg 6.8 → 6.8/10

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: 70 — Book of Jam by Thunderspin

https://slotranker.com/thunderspin/book-of-jam#score

How to cite

Slot Summary

Choosing the next jar in the Super Bonus is the move that separates Book of Jam from a routine expanding-symbol round. Thunderspin starts with a Classic fruit interpretation of the Book formula, then lets collected Bonus symbols interrupt Free Spins with a staged pick game. Its 95.9% RTP, high volatility, and x1000.00 maximum win leave the larger outcomes tied to that extra feature route.

How It Plays

Book of Jam runs on 10 paylines across a 5x3 layout. Separate Wild and Scatter symbols divide ordinary substitution from entry into the Free Spins round.

The defining decision arrives after Bonus symbols fill the collection meter. Jar selections then determine whether the Super Bonus continues upward or ends with the accumulated award.

Theme & Atmosphere

Classic Fruit symbols replace the ancient setting associated with many Book games, while a garden-like Nature presentation connects the reels to the jam-making subject.

Sea and Star labels sit alongside the fruit imagery, but the dominant mood remains domestic and playful, with jars providing the clearest link between theme and bonus play.

Nature Fruit Book Star Sea Classic

Features & Win Potential

A randomly selected Expanding Symbol changes how Free Spins score, filling complete reels when its winning conditions are met rather than acting as the ordinary Wild.

Symbol Collection gives the feature its second objective. Each Bonus symbol adds Energy to the meter, and completing that collection opens the Level Up pick sequence.

High volatility Free Spins Symbol Collection Multiplier Scatter Symbol Wild Symbol 5 Reels Bonus Game Book Of...Symbols collection (Energy)Additional Free Spins BonusGame: Pick Objects Expanding Symbols 10 Paylines Bonus symbols Level Up

Bonus & Free Spins

Three or more Scatter symbols trigger Free Spins with a randomly chosen Expanding Symbol. The Wild remains separate, so the two special symbols perform different jobs.

Collecting five Bonus symbols during Free Spins activates the Super Bonus Game. Players pick jars through five stages, accumulating Multipliers until an empty jar stops the sequence.

The first two stages contain no empty jars, while later stages introduce stopping positions. The Super Bonus can award up to 500x within the slot's x1000.00 overall ceiling.

Spec sheet

Book of Jam at a glance.

Identity

Slot nameBook of Jam

StudioThunderspin

Released8/10/2021

Math

SlotRanker Score70

RTP95.9%

VolatilityHigh volatility

Max win1,000×

Bet range$0.01 – $100.00

Player rating3.6 / 5 · 3 votes

Format

Reels5

Paylines10

Layout5x3

Expected average based on this slot's 95.9% 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 Jam? 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: High

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 (High). The model is calibrated so the average return equals this slot's published RTP (95.90%), 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 Jam

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Compare Book of Jam with other games

	Book of Jam Score 70This game	Sticky Fruit Madness Score 59	Fresh Crush Score 81	Bonanza Farm Rush Express Score 77	Cherry Bomber Score 76
Identity
Studio	Thunderspin	Mascot Gaming	Endorphina	Area Vegas	StakeLogic
Released	8/10/2021	7/15/2024	9/12/2023	2/24/2025	12/25/2024
Math
RTP	95.9%	95.2%	96%	96.5%	96.01%
Volatility	High volatility	High volatility	High volatility	High volatility	—
Max win	1,000×	—	—	5,000×	10,000×
Format
Reels	5	5	6	5	5
Layout	5x3	5x3	6x5	5x4	5x5
Paylines	10	5	Pay Anywhere	20	20
Min bet	0.01	0.05	0.2	0.2	0.2
Max bet	100	12.5	80	50	10
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	—	✓	✓
Free spins	✓	—	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	✓	—	✓	✓	✓
Bonus game	✓	—	—	✓	✓
Respins	—	✓	—	—	—

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

Comparing against

Book of Jam

Thunderspin

RTP

95.9%

Max win

1,000×

Score

+ Respins− Free Spins− Multiplier− Bonus Game

Bonanza Farm Rush Express

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01What is the RTP of Book of Jam?

Book of Jam has a stated RTP of 95.9%, with high volatility and a maximum win listed at x1000.00.

02How are Free Spins triggered?

Three or more Scatter symbols trigger Free Spins and select a special Expanding Symbol for the feature round.

03How does the Super Bonus begin?

Collecting five Bonus symbols during Free Spins fills the meter and opens the staged Pick Objects game.

04What happens during the Super Bonus Game?

The player chooses jars from successive rows. A multiplier advances the feature, while an empty jar ends the picking sequence and awards the accumulated value.

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