Before you load Fish Boom for real, spend a couple of minutes on how it genuinely performs. InOut are the provider behind it, tuning the game for a low volatility profile, with an RTP of 96.3%. You get a 5-reel grid running 25 paylines, all wrapped in polished, characterful visuals. If everything lines up, Fish Boom can pay up to 5,000x your bet. It first went live in 2025 and still earns its place today. The full verdict is below.
Written by Michael Torres · Last updated: January 2026
At its core, Fish Boom is a release produced by InOut, given an engaging visual treatment. It runs on 5 reels and 25 paylines with a low volatility profile, and 96.3% RTP.
Dig into the bonuses and Fish Boom starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. The low volatility makes it forgiving on the bankroll, ideal for relaxed, longer sessions. Overall it's a well-rounded release that knows what it is.
The RTP of 96.3% is right around the industry average of ~96%. This represents a fair return that's in line with what most modern slots offer.
Low volatility means frequent small wins with less risk. This slot is ideal for players who prefer steady, consistent payouts and longer play sessions without dramatic bankroll swings.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Fish Boom features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Fish Boom by InOut is a solid offering that delivers good entertainment value. The 96.3% RTP combined with low volatility creates a well-balanced gaming experience.