Big Bass BOOM Slot by Pragmatic Play

98% RTP in a Big Bass Game. Yes, Really.

Big Bass BOOM dropped as a Stake-exclusive entry in Pragmatic Play's most extended franchise. Over 30 Big Bass games exist at this point, and most shuffle the same fishing-and-collecting formula with minor visual tweaks. BOOM does that too. But the 97.97% RTP makes it hard to brush off. For a high-volatility slot with 10 paylines and a 5,000x cap, a near-98% return rate is rare in any series, let alone one that typically sits around 96%.

The 5x3 grid is familiar territory. Card royals fill the low end at 75 coins for five of a kind. Four fish symbols carry the mid-to-high range, with the fisherman topping the table at 400 coins alongside Fish 1. The tackle box sits between high and low at 100 coins for five. Nothing unusual there.

Fish Money Values and the Collection Loop

Every fish on the grid displays a random money value each spin: 2x, 5x, 10x, all the way up to 5,000x total bet. Thirteen possible values. These numbers are purely decorative during base game spins - they only matter once free spins start and fisherman wilds begin collecting them.

Two scatters without a third sometimes trigger a nudge. The game shifts scatters down a position or hooks a reel upward to reveal a hidden one. It's inconsistent, but it fires enough that you notice the assist.

Free Spins: The Level Grind

Three scatters award 10 free spins. Four give 15. Five give 20. The 100x buy option triggers with 3, 4, or 5 scatters at random.

Before the round starts, up to five pre-round modifiers get applied randomly. More fish on the reels. More fisherman wilds. Increased dynamite and bazooka frequency. Start from level 2 instead of level 1. Plus two extra spins per trigger. Getting all five transforms the round. Getting zero is a cold start. That variance in setup is what keeps repeat sessions from blurring together.

During the round, each fisherman wild collects every fish money value on screen. Every fourth fisherman collected retriggers the feature with 10 bonus spins and bumps the collection multiplier up one level. Level 1 pays straight 1x values. Level 2 doubles everything. Level 3 triples. Level 4 jumps to 10x. After level 4, no more retriggers. So the entire round's payout structure hinges on how fast you accumulate fishermen and what fish values are showing when they land.

Rescue Mechanics Keep Dead Spins Useful

Three special triggers fire during free spins based on board state. Dynamite adds fish money symbols when a fisherman lands with nothing to catch. Hook pulls a fisherman onto the grid when fish are present but no collector is showing. Bazooka replaces all non-fisherman symbols with fresh ones when collections come up empty. These aren't random bonuses - they respond to specific gaps on the board, reducing wasted spins.

The 5,000x Ceiling

Here's the honest trade-off. The RTP is outstanding, the level system adds genuine progression, and the modifiers create variety. But 5,000x is modest for the series. Big Bass Hold and Spinner Megaways pays 20,000x. Even older entries offered higher ceilings. With individual fish values reaching 5,000x and a 10x level multiplier, the math could theoretically support much more, but the hard cap cuts rounds short. You're trading max win upside for consistency, which the 97.97% RTP reflects.

Among 30+ Big Bass titles, BOOM is the one built for grinding rather than chasing a single massive hit. The near-98% return and progressive level system make it a fundamentally different proposition from the rest of the lineup.