Big Bass Bonanza Amazon Extreme slot Review (Pragmatic Play)

RTP: 96.07%

Provider: Pragmatic Play

Best casinos: All British Casino, Casushi, Monopoly Casino, Hot Streak, Rainbow Riches

Big Bass Bonanza Amazon Extreme Key Features

RTP: 96.07%

Provider: Pragmatic Play

Volatility: High

Theme: Fishing

Reel style: 5x3

Paylines: 10

Stakes: £0.10 - £250

Max Win: 10,000x


Free Spins





I embarked on an adventure along the Amazon by playing the Big Bass Amazon Xtreme slot game through the best slots sites featuring this studio. As a fan of slot games, whether you're a newcomer or a seasoned player, you'll find this fishing-themed game utterly captivating. With its thrilling Free Spins Bonus and Ante Bet feature, along with a layout of 5 reels and 3 rows, this high-volatility game with an RTP of 96.07% offered me an unforgettable Amazonian journey.

Casinos that offer Big Bass Bonanza Amazon Extreme slot sorted by RTP

10 No Deposit Bonus Spins on Finn and the Swirly Spin

  • Wagering req. 60x
  • Value/free spin £0.10
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100% Welcome Bonus + 50 Bonus Spins!

  • Wagering req. 40x
  • Value/free spin £0.10
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100% bonus on first deposit up to £50 & 50 Bonus Spins (30 spins on day 1, 10 on day 2, 10 on day 3) for Book of Dead slot only. Min first deposit of £20. Max bonus £50. Max bonus bet £5. Max bonus cash-out £250. 40x wagering requirements. Bonus expiry 30 days. Bonus spins expiry 2 days. Game restrictions apply.
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  • Wagering req. 35x
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Play £10 Get 30 Free Spins on Rainbow Riches

  • Wagering req. 0x
  • Value/free spin £0.01
  • Offer amount £6
New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit.18+. Free Spins: on Rainbow Riches. 1p coin size, max lines. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. **£10 lifetime deposit for Daily Free Game.
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Spend £10, Get 30 Extra Spins on Monopoly Paradise Mansion

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100 Spin Test

This 100 Spin test was updated by Steve Madgwick on 15/08/2023 

100 spins is not a Real Test

We give every slot a 100 spin test to see just what it can do, or not as the case can often be - 100 spins is no reflection of the likelihood of any other 100-spin session, as RTP's are set over many millions and probably billions of spins. So this 100 spin test is just for entertainment and insight purposes

Session RTP44.7%
Win FrequencyLow
Biggest Base Game Win3x
Spins to Bonus33
Bonus Paid23x
Time Taken for 100 Spins
Average Win Value over 100 Spins1.80x

The Spin Test criteria can be found at the bottom of the page

Test Comments

The theme is beginning to wear a little thin and this 100 spin test returning just 44.7% Session RTP did nothing to enthuse.

The wins were very few and far between with just 12 wining spins from the 100, and taking out the free spins round, they averaged out at just 1.80x per win.

The bonus did land after 33 spins, but paid just 23x after gaining an extra fisherman and extra spins, one of those frustrating PP bonus rounds.

I played the 100 spins without activating the 50% spin cost uplift for higher chance of hitting the bonus and of course did anyway - I always advise against playing the higher stake, in my experience, i just don't think it is worth it, and you just burn you balance quicker. [Which of course is the games aim!)

Big Bass Bonanza Amazon Extreme Expert Review

Theme & Symbols
Bonus Features
Max Win (10,000x)
Sounds & Music
RTP (96.07%)

Game Data

Join us on a journey along the world’s longest river, the colossal Amazon. Let the game’s Fisherman lead you on this fishing adventure. The game involves top-notch imagery and entertaining sounds.

In addition to the  Free Spins Bonus and the Ante Bet feature mentioned in the summary. There’s also a Buy Free Spins option which can be instantly triggered from the base game by buying it for 100x the bet. 

If this review is still reeling you in, stay with us to continue reading about all aspects of this slot game. Right, let’s go.

Game Data Table Slot Review

 Slot Review Game Data
StudioPragmatic Play
RTP %96.07%
Reel Style5x3
Stake Range£0.10 - £250
Max Win10,000x
Special SymbolsFisherman Wild Symbol, Scatter Symbol, Money Symbol
FeaturesAnte Bet, Free Spins

Graphics, Music, and Sound Effects

The base game has been designed with bright colours in various shades of blues and greens which suit the river theme. 

And of course, the reel imagery suits the theme well too. You’ll find backpacks, fish and fishing rods to help you on your expedition.

The music is fun and upbeat and suits the explorer vibe of this game. There is also a fun water sound effect for the reels.

Key Features

Now that we’ve covered the summary, intro and graphics, next up, we’ll continue with the key features. This info is important to help you decide if Big Bass Amazon Xtreme is a yay or a nay.

The slot games reviews we create on OLBG include up-to-date info about the essential features. These include themes, paylines, reels, bet ranges, and bonuses. Don't go anywhere as after the key game features we’ll be giving our expert verdict. 

Theme – Fishing

This range of fishing-themed games has worked fantastically for Pragmatic Play. We’ve already reviewed Big Bass Bonanza and Big Bass Splash which are hugely popular games. 

The gentle music and sounds of nature from the Amazon are soothing and the visuals showing beneath the water include bubbles, algae and tropical fish.

The star of the show is the Fisherman who fronts all of the Big Bass slot games. He also represents the Wild Symbol on the reels. In the base game, you’ll spot him taking a sneaky nap in his boat at the top of the screen.

The other reel symbols are a good fit with the theme and in order of value are the fishing float, toucan, fishing rod and backpack. This is followed by the standard Ace, King, Queen, Jack and 10. The game info button is helpful and explains all of the values clearly.

There is a Scatter Symbol represented by what else but a big bass fish? This symbol can appear anywhere on any reel.  

The Money Symbol is also key which is depicted by a selection of fish. During every spin the Money Symbol takes a random value which can then be won during the Free Spins feature. The value of these range from x0.2 right up to a whopping  x1,000. 


The Big Bass Amazon Xtreme game reels you in (so many puns, so little time!) with a classic 5-reel with 3 rows per reel. 


Winning combos are possible on 10 paylines for this game and these lines are non-adjustable.


RTP or Return to Player, to give it its full name, is a way of predicting the return of stakes to players. This is always a percentage figure which is usually somewhere between 94% and 96%. The Big Bass Amazon Xtreme game is 96.07% which is slightly higher than average.

Like all slot game suppliers, Pragmatic Play uses the RTP percentage as a default value. However, you’ll find different RTPs at various slot operators. We’ve found a few different amounts at UK online casinos and added these to our table below.

It’s worth mentioning that it’s not just RTP that should be the decider when making a choice in where to play. You should also consider factors like payment options, game library, customer support and welcome bonuses and deals etc. Our casino reviews look at all of these factors and more.

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Most players nowadays like to try different slot games. For this reason, we’ve created a page with the slot sites we recommend. There are stacks of games here to choose from and if you’re a UK player you can launch them straight away. 

Stake Range

Big Bass Amazon Extreme has a wide bet range which starts at £0.10 and goes right up to a mega £250.

Max Win

You’ll be able to reel in a big catch with a x10,000 return on your stake if you manage to land the max win.

Wild Shape

As previously mentioned the Fisherman represents the Wild Symbol for this game. The Wild appears on all reels during the Free Spins round. It substitutes for all symbols except the Scatter and Money Symbols.

Free Spins

The Free Spins Bonus is where the magic happens. If 3 or more of the Scatter Symbols appear on the reels it triggers the Free Spins Bonus round. 

You start round this fun feature with a Pick A Pot where you’re taken to an exclusive room filled with large clay pots somewhere in the depths of the Amazon jungle. Here you pick your pots to see which modifier prizes you’ll win. This gets you prepped for your foray into the Free Spins Bonus. Prizes include extra free spins, adding guaranteed money symbols to each spin and collecting more Fisherman Wilds. This means that you may start your bonus round with up to 3 Fisherman Wilds. The Pick A Pot feature finishes when a boot is revealed and you then head to the excitement of the Free Spins Bonus round. 

During the Free Spins Bonus round, you play your 10 free spins plus any extra modifiers won with the Pick A Pot session. During the Free Spins round, there is yet more excitement waiting for you as random features can trigger such as Money Symbols appearing on the reels. The waterfall feature is an animated graphic which pops up and changes all symbols on the reels. There’s also a hook animation which randomly changes the reels to show Scatter Symbols or Fisherman Symbols. Simply put, you never know what you’re going to catch during this Amazon adventure.


Like most modern-day slots the Big Bass Amazon Xtreme game doesn't have a jackpot element. If jackpots are what floats your boat you should take a look at our page with the best jackpot slot games.

Play Experience & First Impressions

Even though there are currently 10 games in the Big Bass series there has still been much anticipation over this latest release. The high-quality imagery and gentle, cheery music make for an enjoyable experience. The base game is pretty similar to the other Big Bass games but the features are a huge pull. 

Expert Verdict

The bonus rounds usually stand out in modern slot games but this one goes the extra mile. The Free Spins Bonus is fantastic as there are so many elements to this feature. We enjoyed the fact that the Pick A Pot was the first step in the bonus and although less impressive visually than the rest of the imagery it’s exciting to see which modifiers you win. This and the actual Free Spins Bonus takes up quite a bit of time as it builds up the anticipation. Being able to buy Free Spins was also a huge plus. 

The base game has the usual number of reels and 10 fixed paylines which is low but the extras are what sell this game. The bet range is good and starts at 10p which is appealing for many players but it’s a high-volatility game.

The Ante Bet feature is a nice touch as by paying 50% extra you’ll increase your chances of triggering free spins which is what this game is all about.

We really liked the randomness of the game, during the Free Spins Bonus there were random features and wins popping up such as the waterfall feature which changes all of the symbols on the reels. Even during the base game when only 2 scatters have been triggered there’s a chance of a random feature bringing a third Scatter Symbol to the reels so it feels like there’s always potential to win.

All in all, it’s fair to say that we fell hook, line and sinker for this game so 100% give it a try.

Editorial Information

Big Bass Amazon Extreme slot review was written by the OLBG Slots Content Team, beginning with Andrej Trajkovski, who has worked in the online gambling industry since 2013, playing and reviewing online slots and casinos daily for the past four years. 

Contributing to the review was Jake Ashton, a slots fan who is also part of the casino and sports betting team here at OLBG and Jenny Mason with Online Casino, Bingo and Slots Experience from over 15 years in the industry. 

The review is Fact Checked by William Westerlund, an online casino expert reviewing casinos and slots for over five years, and published by Steve Madgwick, our Editor-In-Chief with over 18 years of experience creating and managing high-quality sports betting and Casino content for OLBG & multiple other publications and a self-confessed online slots fans who has played at 100's of the best slot sites online and completes the Spin tests.

100 Spin Test Criteria

The 100 Spins test is undertaken on a demo slot, staking 100 spins at £1 per spin

Session RTP - Return to the player after 100 spins - Eg, A return of £45 from 100 spins is 45%, or a return of £107 is 107%

Win Frequency - A winning spins to spins frequency, higher frequency regardless of prize, is often more entertaining.

  • 0-10 Very Low
  • 11-15 Low
  • 16-30 Medium
  • 21-35 High
  • 36+ Very High

Biggest Base Game Win  - Highest single base game spin winning value

Spins to Bonus - How many spins were completed before the main bonus round was achieved

Bonus Paid - Value of bonus once complete

Time Taken  - How long did the 100 spins take to complete?

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