Pragmatic Play pulled the trigger on its biggest 2026 slot release this morning, with Big Bass Bigger Fishing going live across UK-licensed sites from 23 April. The new instalment carries a 96.71% default RTP, a 10,000x max win (the largest ever in the franchise) and a reworked fisherman collect mechanic. It's already been slotted into the lobbies of the major UK <a href="/online-casinos/">online casinos</a>.
What's new in the maths model
The headline change is the max win ceiling. Previous Big Bass titles capped at 2,500x or 5,000x, but Bigger Fishing doubles the last high-water mark to 10,000x stake. That pushes the title firmly into high-volatility territory, and the hit frequency in the base game sits at roughly 28% according to the math sheet Pragmatic circulated to operators.
The default RTP is 96.71% (slightly above the series average) but operators have the option to deploy 95.52% or 94.03% variants. UK players should always check the in-game info pane before spinning, as Pragmatic has been moving more titles to multi-RTP configurations this year. Our player guides cover how to spot the active RTP in seconds.
Bet sizes start at 10p and top out at £125 for UK customers, though, of course, the incoming October stake cap will clip that to £5 (or ) later in the year. For now, the bet ladder gives high-rollers a generous spread while they still have it.
Fishing mechanic reworked
The signature fisherman feature returns but with two notable upgrades. First, the fisherman now collects fish values across up to 15 free spins rather than the usual 10, giving a meaningfully longer runway for multiplier accumulation. Second, each fourth fisherman appearance now adds a persistent 2x global multiplier (stackable up to 10x) which is where the 10,000x max win is most commonly hit.
There are three retrigger tiers: 3 scatters grant 10 free spins, 4 grant 15, and 5 grant 20. The retrigger threshold has been softened from four to three scatters, making the feature more accessible during the bonus round itself. Pragmatic's data suggests the bonus hits roughly once every 190 spins in the default config.
A new 'ante bet' side option lets players double the stake to boost scatter frequency by around 50%. This is the same mechanic found in Sweet Bonanza and Gates of Olympus and has been well-received by UK players according to early operator telemetry from launch day.
Where to play and what to watch for
Bigger Fishing launched simultaneously across Sky Vegas, PaddyPower Games, 888casino, LeoVegas and Bet365 Games, with William Hill Casino, Betfred and Mr Vegas rolling it out within 48 hours. Several brands are pairing the release with free-spin promotions, though as always players should check wagering terms carefully, our news desk will track the best offers through the week.
UK operators are expected to keep the title prominently in their 'New Games' rails for at least a month, given Pragmatic's usual commercial muscle on launch windows. Early A/B data from two operators suggests the game is driving 20–30% higher sessions-per-user than the previous Big Bass release, so expect heavy front-page placement.
One thing to watch: regulators are increasingly uncomfortable with extreme volatility titles being marketed on 'max win' figures. The UKGC restated its advertising guidance earlier this month, and operators are already noticeably toning down 10,000x headline claims. Expect the marketing language around Bigger Fishing to settle quickly on feature-led, rather than max-win-led, messaging.
