Contents
Introduction
Big Thunder is an extravagant, flashy game brought to your screens by game provider, Ainsworth. Think King Kong combined with Tarzan, and throw in a few extra jungle clichés, and you have the basic concept for this explosive game.
Whilst the game itself might be an amalgamation of existing classics, that’s not to say it doesn’t have plenty of original perks to it, which will have you hooked.
Theme and Graphics
A mighty silverback gorilla is the king of the jungle in this particular Ainsworth slot. Similar in many ways to Peter Jackson's King Kong, it's clear to see which similarities the developers have drawn from the famous tale when creating their main man, 'Big Thunder'.
Great Jungle Theme
Jungle-themed online slots games are always popular with slots developers, as there’s plenty of scope to create engaging symbols and soundtracks which help to bring games to life on players’ screens.
And Big Thunder, created by the mighty Ainsworth software company, delivers up an entertaining and engaging game based around the antics of a giant gorilla.
Beautiful Setting
The setting for the game is deep within the rainforest. Across the forest floor you’ll see broad-leaved plants, with the game’s reels held in place by trailing vines.
The background to the reels is parchment-coloured, which lets the symbols really stand out, so you won’t miss any potential winning lines when they occur.

Big Thunder RTP and Volatility
The Big Thunder RTP is stated as being 94.38%, which means that the game pays out 94.38 for every 100.00 spent on spinning its reels.
Big Thunder is classified as a high-volatility game, which means that it doesn’t pay out too frequently. You might have to sit out some fairly lengthy lean spells before you hit the Big Wins, but once they arrive, the sums of money involved tend to be extremely generous.
Big Thunder Free Spins
How to Play Big Thunder
The design of Ainsworth's Big Thunder slot is very intuitive:
- There are 30 variable paylines attached to the game, so your first decision will be how many to include with each spin. Your stake for every spin is based on the number of lines that you choose to play with, although we always advise playing with the maximum if you can afford to, as this offers the best odds of landing a win.
- Use the slider to adjust the amount of your line bet. A Total Bet window at the bottom right-hand corner of your screen lets you know how much you are paying per spin
- Any wins will be highlighted for you, and the amount will be displayed at the bottom of your screen before being added to your balance.
- Click or tap on the ‘+’ button alongside the Spin button and you’ll be able to activate Autoplay. A pop-up menu will appear displaying a slider, beneath which are three grey buttons.
- The button on the left allows you to set your loss limits that will end the feature prematurely, while the one on the middle defines the number of automatic spins.
Paytable
The game’s paytable is dynamic, so whenever you access it, it’ll display the potential winning amounts based on your current stake. You can access the paytable in the same way that you set the betting amounts, number of paylines and Autospin feature:
- Tap or click on the Settings icon to the far bottom left-hand side of your screen.
- When the pop-up box appears, tap on the ‘I’ button at the top, then again on the ‘Rules’ button.
- Close the screen with the red ‘x’ button to return back to the game.
How to Win at Big Thunder
You’ll need to spin up three or more matching symbols across an active payline to win a cash prize at the reels of Big Thunder. The first instance of the symbol must occur on the first reel, with further matching symbols appearing on consecutive reels in line with the relevant payline structure.
There’s a Wild symbol to help you spin up winning lines. The gorilla Wild substitutes for most of the other symbols on the reels, apart from the Scatter, King Strike and Multiplier symbols, so it’s easier than you might think to hit some winning combinations.
Big Thunder Special Features and Free Games
Big Thunder is packed to bursting with a great selection of added-value features that not only create a more interesting game to play, but they also offer some extra chances to scoop some huge cash prizes too.
Wild Symbol
We’ve already mentioned the game’s gorilla Wild symbol, which stands in for any other symbols across the reels apart from the Scatter, the King Strike symbol- and the Multipliers that only appear in the Free Games rounds.
On its own, it doesn’t have any value at all in the base game, but once the Free Spins appear, even two occurrences of the Wild gorilla will generate a cash prize.
Scatter Symbol
The Big Thunder slots game logo has been picked to be the Scatter in this game, and when you spin up three or more, in any position on the reels, you’ll be awarded a generous cash prize.
Most Scatters don’t come with their own paytable, but in this game it’s the Scatter that pays out the biggest cash prizes of all, so it’s a particularly welcome sight.
Free Spins
Three or more Scatters will also trigger the Free Games bonus round in Big Thunder. As lightning flashes and thunder roars, you’ll be awarded a total of 15 Free Games and transported deeper into the jungle for them to take place on an alternative set of reels.
Throughout your 15 Free Spins, all lower-paying symbols have been removed from the reels. The slot has also gained an extra reel too, although this sixth reels only contains three symbols:
- a Scatter
- a 3x Multiplier
- a 5x Multiplier.
If you achieve three or more scatters, you’ll gain five more Free Games to be added on to your total.
Big Thunder King Strike Feature
Throughout the base game of Big Thunder, you’ll see a small sixth reel attached to the right-hand side of the game. This is the King Strike reel, which is something that you’re likely to have come across before if you’ve played Jade Emperor or Electric Nights.
Aside from the software developer's ‘A’ logo, the only symbol which appears on this Bonus Reel is the King Strike crown icon. And it only becomes relevant when you hit five-of-a-kind across an active payline.
At the top of your screen, in the base game of Big Thunder, you’ll see four jackpots displayed: Major, Maxi, Minor and Mini cash sums. The amounts shown are dependent upon the amount of your stake, as you’ll see for yourself when you change the sum you’d like to wager with each spin:
- The Mini award is paid out when you achieve a King Strike icon at the same time that you spin up five-of-a-kind of one of the lower-value playing card symbols in a combo that includes a wild.
- When you land a five-of-a-kind win with high-paying symbols including a wild, you'll trigger the Minor Jackpot.
- When you line up five-of-a-kind low-value playing card symbols, plus the King Strike symbol, without the aid of a Wild, you’ll receive the Maxi Jackpot payout.
- Spinning up five matching high-value icons without the help of a wild will land you the Major Jackpot prize, which is potentially worth up to 1,000,000.00!
Play Big Thunder for Free
Playing a game for free is the best way we know of learning all about it. If you’re going to wager your own hard-earned cash on the outcome of every spin, then you’ll need to be sure that a game is going to deliver up the best gaming experience.
But why waste your money while you’re still learning about a game? In the case of Big Thunder, with its King Strike Bonus feature and Free Games rounds, you could use up a fair amount of your bankroll just deciding on a suitable wagering level.
When you play Big Thunder for free, on the other hand, you get to try out a variety of wagering strategies before committing any of your money. Trigger the bonus feature, so you’re familiar with the way it works, and calculate how long it takes to start racking up some impressive wins.
This is the sort of information that will prove invaluable later on if you decide to wager real money on the game.
Disclaimer: Big Thunder trademark / license is owned by Ainsworth. This site is not endorsed by Ainsworth.
| Slot Name: | Big Thunder |
|---|---|
| Software: | Ainsworth |
| RTP: | 94.38% |
| Volatility: | Medium volatility |
| Paylines: | 30 |
| Reels: | 5 |
| Min Bet (all lines covered): | $0.30 (CAD) |
| Max Bet: | $3000 (CAD) |
| Top Win: | 75 |
| Features: | Bonus Game, Progressive, Wild Symbol, Scatter Symbol, Multiplier, Free Spins, Medium volatility, 5 Reels |
| Themes: | Action & Adventure, Animals, Nature |
| Last Update: | 17/02/2023 |
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