Slots Like Big Bass Mission Fishin’: Secret Files and a Choice of Two Bonuses

Reel Kingdom sends its fisherman on a night-time spy mission with Big Bass Mission Fishin’, a 5 reel, 3 row, 10 payline release where a wild diver collects randomly valued Money symbols worth up to 5,000x stake on their own. Landing 3, 4 or 5 scatters hands you a genuine fork in the road rather than a single fixed bonus: pick Free Spins for 10, 15 or 20 rounds with a secret-file modifier stage first, or pick Stack the Cash for a hold-and-win round built around locking coin symbols and doubling robo-crab bombs. An Ante Bet raises your stake by roughly half in return for a better shot at triggering that choice naturally, and where it is permitted a Feature Buy priced at 100x stake guarantees the scatters land outright. The default configuration pays out 96.50%, volatility sits high, and stakes run from 10p to £250 a spin.

Where to Play

18+ only. T&Cs apply. Please gamble responsibly.

Slots Like Big Bass Mission Fishin’

The rest of Reel Kingdom’s Big Bass family sits alongside a couple of money-collect picks built by other studios.

• Big Bass Bonanza
  
  The original the whole franchise grew from, running the same wild-fisherman Money Symbol collection but without the Secret Files stage or the Stack the Cash alternative found here.
• Bigger Bass Bonanza
  
  A same-studio sibling built around a Bazooka feature and 12 paylines rather than the dual-bonus choice and 10 fixed paylines used on this page.
• Big Bass Amazon Xtreme
  
  A jungle-set sibling pushing the ceiling to 10,000x stake through its own Ante Bet, though it sticks to a single Free Spins path instead of a choice of two bonuses.
• Big Bass Splash
  
  Another same-studio pick with its own modifier twist, built around a single bonus round rather than the Free Spins or Stack the Cash fork used here.
• Big Bass Vegas Double Down Deluxe
  
  Neon Vegas lighting and a pair of Wilds replace the spy theme and Secret Files stage here, though the underlying Money Symbol collection stays familiar.
• Fishin’ Christmas Pots of Gold
  
  Christmas takes over from the spy mission on this same-studio release, trading Secret Files and Stack the Cash for a more conventional festive free spins round.
• Gold Blitz
  
  A Fortune Factory Studios pick built around its own Cash Collect symbol rather than a wild-fisherman collector, useful if you want the money-collect format from a different developer.
• Andvari the Golden Fish
  
  A Foxium release leaning on Coin Collect wilds and reel-locking rather than a scatter-triggered choice of bonus rounds, though the fishing theme carries over neatly.
• Big Bass Halloween 2
  
  This zombie-fisherman sequel layers a four-level Free Spins multiplier climb reaching x10 onto the classic Money Symbol formula, rather than the dual Free Spins or Stack the Cash choice found here.
• Big Bass Raceday Repeat
  
  Splits its bonus into two selectable paths at trigger time, a different kind of choice to the paid bonus-replay chance a racing-themed sibling offers instead.
• Marlin Masters Atlantis
  
  This Reel Kingdom release hands you a choice between two bonus rounds the moment scatters land, a genuinely different structure to the scatter-tiered format found here.

How the Game Works

Reviewed by Brian Taylor
Published: July 2026

SlotsLike.co.uk contains affiliate links. We may earn a commission if you sign up via our site. It never affects our reviews or ratings. 18+ only. Please gamble responsibly (GamCare, BeGambleAware, GamStop).

A moonlit dive gives way to a submarine-hideout backdrop, complete with a bearded diver kitted out in secret-agent gear rather than the usual fishing waders. Card ranks 10 through Ace fill the low end of the paytable, paying 5x to 10x stake for five in a row, while boats, harpoon guns, dragonflies and tackle boxes sit above them, worth 20x to 200x for a full line. A robotic fish handles scatter duty, and the diver himself substitutes as the Wild.

Money symbols land carrying their own random cash value, anywhere from 2x up to the game’s 5,000x ceiling, and stay put until a passing Wild fisherman sweeps them up for an instant payout. It’s the same core engine every Big Bass game runs on, just dressed in night-vision goggles instead of a sun hat.

Two Bonus Rounds, Secret Files and Stack the Cash

Landing 3, 4 or 5 scatters doesn’t drop you straight into a single bonus, it opens a choice screen. Picking Free Spins hands you 10, 15 or 20 rounds depending on the scatter count, but first you work through a stack of Secret Files, each one revealing a modifier such as more Money symbols, an extra Wild fisherman, or +2 spins, until a boot symbol ends the picking stage and the spins themselves begin.

Choosing Stack the Cash instead swaps the reels for a hold-and-win round: four respins to start, Fish Coin symbols worth a set multiple of stake lock in place and reset the respin count whenever a new one lands, and once every position is filled the coins drop into waiting robo-crabs for a lump payout, occasionally doubled by a random bomb symbol along the way.

Switching the Ante Bet on costs half as much again per spin but shortens the odds of seeing that choice screen come up naturally, and on sites where it is permitted a 100x stake Feature Buy guarantees the scatters land so you can pick a mode immediately.

Pros and Cons

Pros

• Choosing between Free Spins and Stack the Cash at trigger gives players a genuine say in how the bonus plays out
• The Secret Files picking stage adds a layer of anticipation most Big Bass titles skip entirely
• Stack the Cash offers a quicker, more visual payout than sitting through a full spins round
• The spy-mission dressing is a fresh coat of paint on a formula that can otherwise feel repetitive across the franchise
• High volatility with a 5,000x ceiling keeps the format relevant for bigger-stakes chasers

Cons

• Not every UK-facing operator offers the 100x Feature Buy shortcut
• Lower 95.50% and 94.50% RTP builds are also known to circulate
• Two bonus modes to learn adds a bit more complexity than the series’ usual single free spins format
• High volatility means dry spells between features can run long

Game Screenshot

Demo Play

Working through a few Secret Files runs in demo mode first is the quickest way to see which modifiers you’re likely to land before choosing real stake. Browse our free demo slots here.

Expert Take

Reviewers have generally welcomed the choice between Free Spins and Stack the Cash as the most meaningful change the Big Bass series has made in years, giving players actual agency over how a bonus round unfolds rather than sitting through the same fixed format every time. The main criticism levelled at it is that the underlying Money Symbol engine is unchanged, so anyone burnt out on the franchise won’t find a reason here to come back.

About the Developer

Big Bass Mission Fishin’ launched from Reel Kingdom, Pragmatic Play’s dedicated fishing-slot studio, on 17 June 2024. Giving players a genuine choice between two distinct bonus rounds is a rare structural change for a franchise that usually just re-skins the same free spins format, and it’s a welcome one. See more on our Reel Kingdom slots page.

Big Bass Mission Fishin’ Key Stats

Big Bass Mission Fishin’ slot information last reviewed: July 2026

Slots with the Same Features

Two further money-collect picks worth weighing up against Big Bass Mission Fishin’.

More Money-Collect Slots

Neither runs the Big Bass engine, but both lean on a similar collect-and-cash-in structure from different developers.

More Reel Kingdom Slots

Two more from the same studio, each running its own take on the core Big Bass formula.

Frequently Asked Questions

How do I trigger the bonus in Big Bass Mission Fishin’?

Landing 3, 4 or 5 scatters opens a choice screen where you pick between Free Spins and Stack the Cash.

What are the Secret Files in Free Spins?

Before the spins begin, you work through a stack of files revealing modifiers like extra Money symbols or a bonus Wild fisherman, until a boot symbol ends the picking stage.

How many Free Spins do I get?

3, 4 or 5 scatters award 10, 15 or 20 Free Spins respectively.

What is Stack the Cash?

A hold-and-win round with 4 starting respins, where Fish Coin symbols lock in place and reset the respin count, and a full set of coins pays out via robo-crabs, sometimes doubled by a bomb symbol.

What does the Ante Bet do?

Turning it on costs half as much again on top of your regular stake, and improves the odds of the bonus choice screen appearing without buying in directly.

Is there a Feature Buy on Big Bass Mission Fishin’?

Where it’s permitted, a 100x stake Feature Buy guarantees the scatters land so you can pick a bonus mode immediately.

What is the RTP of Big Bass Mission Fishin’?

The default build returns 96.50%, though lower 95.50% and 94.50% configurations may be used by some operators.

How volatile is Big Bass Mission Fishin’?

It’s rated high volatility.

What is the maximum win on Big Bass Mission Fishin’?

5,000x stake is the top prize on offer, achievable through the wild-collected Money symbols.

Our Verdict on Big Bass Mission Fishin’

Big Bass Mission Fishin’ doesn’t change the core Money Symbol engine that’s carried the franchise for years, but handing players a genuine choice between Free Spins and Stack the Cash at the point of triggering is a smart, overdue update. The Secret Files stage adds a nice bit of build-up before the spins even start, and high volatility keeps the 5,000x ceiling feeling within reach. A worthwhile pick for series regulars looking for something a little different.

SlotsLike rating: 7/10