Fish Boom

8.2/10

Release November 2025· Updated October 2026

Fishing-themed instant win on a 4x5 grid from InOut Games (November 2025). RTP 96.3%. BetsRank score: 8.2/10.

RTP

96.3%

Volatility

Medium

Grid

4x5 grid

Bonus Buy

Un hameçon tombe dans une des 20 cases"Big Fish" couvre 2 cases (gain fusionné)TNT explose une zone 3x3Free spins via jauge (2-50 tours)

8.2

BetsRank Verdict

Our read of the game, based on the data the studio publishes

Released on November 18, 2025, Fish Boom is a fishing-themed instant win on a 4x5 grid: a hook drops into a cell, and a 'Big Fish' can cover 2 cells for a higher merged win. RTP 96.3%, moderate volatility for the InOut catalog. Free spins are triggered by a gauge (2 to 50 rounds).

Strengths

+Moderate volatility — a steadier pace
+Big Fish and TNT add variety
+Free spins via a progressive gauge
+Bonus bet doubling your stake available

To consider

−Only one hook per round (less simultaneous action)
−Max win of $20,000 is modest versus step-multiplier titles
−No Bonus Buy available
−Classic fishing theme, not very differentiated

About Fish Boom

Released on November 18, 2025, Fish Boom offers a fishing-themed instant win on a 4x5 grid (20 cells, single betway): each round, a hook drops into a cell. A 'Big Fish' can cover 2 cells for a more generous merged win, while TNT blows up an entire 3x3 zone. RTP 96.3%, medium volatility — steadier than most of the InOut catalog. A gauge to fill triggers free spins (2 to 50 rounds). A bonus bet lets you double your stake (up to $100) to improve your odds.

Key Mechanics

▸4x5 grid, one hook per round
▸Big Fish covers 2 cells
▸TNT blows up a 3x3 zone
▸Free spins via a gauge (2-50 rounds)
▸Bonus bet doubling your stake

❓Fish Boom FAQ

What is the RTP of Fish Boom?▾

Official RTP: 96.

3%.

How does the Big Fish work?▾

Instead of a single-cell hook, a Big Fish symbol can land covering 2 adjacent cells at once, merging their payouts into a single, larger win.

What triggers the free spins on Fish Boom?▾

A progressive gauge fills up as you play.

Once it's full, a free spins round is awarded, ranging from 2 to 50 rounds depending on how far the gauge was filled.

Is Fish Boom available at online casinos?▾

Yes, it's available at crypto/anonymous casinos in the BetsRank top rankings that carry InOut Games.

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Slot sheet last updated on October 22, 2026 · Sources: slotcatalog.com, official studio sites