Thunderkick

Big Fin Bay

Slots Video Slots Action & Adventure Fish Sea

Fishing slot with variable reels and expanding Wild pressure

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

96.14%

return to player

Volatility

High volatility

variance

Max win

15,040×

top multiplier

Min bet

$0.10

per spin

Reels

5040 lines

Player rating

4.8 ★

11 votes

DEMO Play free, no signup

Thunderkick

Embed on your site

4.8 / 5

11 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 96.14% → 9.0/10

Volatility9/10

high → 9.0/10

Win Potential8.4/10

x15040.00 (15040×) → 8.4/10

Features10/10

18 features → 10.0/10

Game Mechanics7.4/10

f=18 r=6 p=5040 → 7.4/10

Context signals (tie-breakers)

Layout5/10

6x4 → 5.0/10

Bet Flexibility6/10

0.1–100 (×1000) → 6.0/10

Provider Reputation7/10

provider avg 7.0 → 7.0/10

Popularity7.5/10

synthetic proxy → 7.5/10

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: 83 — Big Fin Bay by Thunderkick

https://slotranker.com/thunderkick/big-fin-bay#score

How to cite

Slot Summary

Big Fin Bay fills the gap between a familiar fishing slot and a changing reel game, keeping a 96.14% RTP while shifting reel heights across its six reel layout. Thunderkick uses 5040 ways in the base game, then lets Expanding Wilds, Mystery Symbols, and the bonus reshape how much of the grid is active. High volatility and an x15040.00 ceiling make the expanding format the real identity, not decorative fishing imagery.

How It Plays

Each base spin places different reel heights across six reels while preserving 5040 ways. Wins form when matching symbols connect on consecutive reels from the left.

A winning Wild expands through its entire reel. The random Mystery Symbols event can turn as many as three reels Wild for that spin, but Scatter Symbols do not appear during the event.

Theme & Atmosphere

The Fish and Sea themes center on a golden marlin, giving the slot a clear pursuit rather than a generic collection of marine symbols.

Action & Adventure comes from the hunt itself: the fisherman searches Big Fin Bay for the marlin while the changing grid makes each attempt feel unstable.

Action & Adventure Fish Sea

Features & Win Potential

Expanding Wilds matter because reel height changes their coverage. A Wild on a taller reel occupies more positions, while Mystery Symbols can convert several reels at once.

The Random Wilds and Additional Wilds behavior is separate from the Scatter Symbol. That separation prevents the random Wild event from also opening the bonus.

High volatility Free Spins 6 Reels Scatter Symbol Wild Symbol Respins Expanding Wilds Mystery Symbols Expanding Reels Symbol Swap Additional Free Spins Expanding Symbols RTP range 96% RTP Colossal Reels Grid Random Wilds / Additional Wilds Level Up

Bonus & Free Spins

Three or more anchor Scatter Symbols open Free Spins, and each triggering reel contributes a random spin award of up to six Free Spins.

During Free Spins, every landing Wild expands and causes a respin. The affected reel can grow, remain expanded, and award three Additional Free Spins when it reaches maximum height.

Spec sheet

Big Fin Bay at a glance.

Identity

Slot nameBig Fin Bay

StudioThunderkick

Released3/17/2021

Math

SlotRanker Score83

RTP96.14%

VolatilityHigh volatility

Max win15,040×

Bet range$0.10 – $100.00

Player rating4.8 / 5 · 11 votes

Format

Reels6

Paylines5040

Layout6x7

Expected average based on this slot's 96.14% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$1.54

Cost per session$1.54

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 Big Fin Bay? 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 (96.14%), with wins capped at its top multiplier (15,040×).

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 Big Fin Bay

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Compare Big Fin Bay with other games

	Big Fin Bay Score 83This game	Broadsiders Score 86	Catch 22 - Frozen Fortune Score 86	Lucky Barrel Tavern Score 86	Net Gains Score 84
Identity
Studio	Thunderkick	Massive Studios	Realistic	Belatra Games	Relax Gaming
Released	3/17/2021	1/27/2025	12/5/2024	6/27/2024	12/6/2022
Math
RTP	96.14%	96.62%	96.13%	96.14%	96.1%
Volatility	High volatility	—	Medium/High	High volatility	High volatility
Max win	15,040×	30,000×	12,000×	12,000×	15,000×
Format
Reels	6	7	6	6	6
Layout	6x7	4-5-6-7-6-5-4	6x5	6x4	6x4
Paylines	5040	Cluster Pays	4096	Pay Anywhere	4096
Min bet	0.1	0.1	0.1	—	0.1
Max bet	100	100	10	—	60
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	—	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	✓	✓	✓	✓
Bonus game	—	—	✓	—	—
Respins	✓	—	✓	—	—

Every number is shown as a delta against Big Fin Bay.

Comparing against

Big Fin Bay

Thunderkick

RTP

96.14%

Max win

15,040×

Score

+ Multiplier− Respins

Catch 22 - Frozen Fortune

+ Multiplier+ Bonus Game

+ Multiplier− Wild− Respins

+ Multiplier− Respins

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01What is the RTP of Big Fin Bay?

The listed RTP is 96.14%. That figure describes long run theoretical return, while individual sessions can vary sharply because the slot has high volatility.

02How do Free Spins start in Big Fin Bay?

Land three or more anchor Scatter Symbols. Each triggering reel contributes a random Free Spins award, after which Wilds can cause respins and lasting reel expansion.

03Can Wild symbols change an entire reel?

Yes. A winning Wild expands across its reel, while the random Mystery Symbols feature can turn as many as three reels Wild for one spin.

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