InOut GamesFishing-themed instant win on a 4x5 grid from InOut Games (November 2025). RTP 96.3%. BetsRank score: 8.2/10.
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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).
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.
Official RTP: 96.
3%.
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.
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.
Yes, it's available at crypto/anonymous casinos in the BetsRank top rankings that carry InOut Games.
Slot sheet last updated on · Sources: slotcatalog.com, official studio sites
