Return to Player
94.38%
Minimum bet
0.01
Game category
Video Slots
Volatility
Medium
Reels
6
Progressive jackpot
Yes
Popularity
Maximum bet
3000
Game Provider
Ainsworth
Bonus features
Yes
Paylines
30
Theme
Adventure
Play Big Thunder online: slot game
In Evan Carrington’s review for Al Buraq Regina, Big Thunder is described as a well-crafted 3D video slot in Ainsworth’s King Strike series. It caters to players looking for action-packed play and flexible betting, with free spins featuring multipliers and retriggers, stacked wilds, substantial scatter multipliers and 4 jackpots. A 6th bonus reel means a jackpot can trigger on any spin.
Theme and Story
Big Thunder is part of Ainsworth’s ‘King Strike’ slot series. It takes place in a dense Southeast Asian jungle, where tigers and gorillas appear among Buddhist and Hindu relics. These images present the objects as symbols of luck and fortune woven into the reels.
Graphics, sound and animation
Ainsworth sets the game against a jungle backdrop filled with ancient relics and wildlife. The symbols feature detailed 3D artwork designed to stay crisp on mobile and desktop screens. The design is presented as suitable for either device, with a chance to play for the progressive jackpot.
The audio also departs from the provider’s usual style. Ainsworth often relies on classic slot sounds, letting the action speak for itself. In Big Thunder, the online slot game features tiger and gorilla roars, as well as thunder when an animated bolt strikes the reels before a possible scatter bonus.
Top casinos to play Big Thunder:
How to play
The opening screen brings several features together. Above the 5-reel layout are the Major, Maxi, Minor and Mini progressive jackpots. A ‘Bonus Bet’ control sits on the right; it functions as a 6th reel and description, adding no extra cost to a spin.
To play for a jackpot, select a wager per line and the number of lines through the menu or game interface. The line wager times the selected number of lines gives the total stake per spin. Once set, spins can be started one at a time or with auto spins.
The rare gorilla can appear on reels 3, 4 and 5 as the wild symbol. It substitutes for any regular symbol to help create or extend a winning combination. Gorilla wilds can land in stacks of 3 or as single symbols.
Regular symbols include an ancient religious mask, snake, shield, waterfalls, drums and the card ranks Ace, King, Queen, Jack, 10 and 9. The gorilla is also the highest-paying symbol: combinations pay 2,000x, 300x, 100x or 5x the bet per line when 5, 4, 3 or hit an active pay line. Other regular symbols form winning combinations with 5, 4 or 3 matching symbols.
A scatter symbol awards multipliers on the total spin bet and can trigger the free spins feature, which the original review identifies as a source of many larger wins. The bonus reel’s ‘Kings Crown’ symbol must also land alongside the pictured regular symbols to award a progressive jackpot.
Jackpots and free spins
Each jackpot requires a specified combination to land on a pay line. In every case, the ‘crown’ must also land on the ‘Bonus Bet’ reel to activate the payout.
Major: 5 waterfalls, drums, shields, snakes or masks, plus the Crown on the bonus reel.
Maxi: 5 A, K, Q, J, 10 or 9 symbols, plus the Crown on the bonus reel.
Minor: 5 waterfalls, drums, shields, snakes or masks with the wild symbol, plus the Crown on the bonus reel.
Mini: A, K, Q, J, 10 or 9 with the wild symbol, plus the Crown on the bonus reel.
The ‘Big Thunder’ logo scatter can land anywhere across the reels to trigger free spins. It first awards a multiplier on the spin bet, based on the number shown. Listed values are 100x, 50x, 20x or 2x for 5, 4 or 3 scatters, respectively.
The feature then awards 15 free spins on specially designed reels, with an extra bonus reel showing x3 and x5 multipliers. Wins are multiplied by the symbol on that reel. The Gorilla remains a substitute, while scatters can award a spin-bet multiplier and retrigger 5 free spins.
Bet Sizes, RTP, and Variance
The source review describes a wide range of bet settings for Big Thunder. The maximum is 30 lines at 100.00 per line, for a stated total of 3,000.00 per spin. The minimum is 1 line at 0.01 per spin. The listed RTP is 94.38%, and the game is classified as medium variance.
Review Summary
Big Thunder may suit players who enjoy free spins with multipliers and the chance to win a jackpot. The original review points to the jungle theme, graphics and animation, and how they work with the game’s features. It describes the overall experience as lively, with several mechanics to explore.
Evan Carrington brings more than 12 years of experience in the iGaming industry, specializing in online casino reviews, slot game analysis, and player safety assessments. Their expertise includes casino licensing, RTP, volatility, bonus terms, and withdrawal policies. Combining hands-on reviews with independent research, Evan provides clear, evidence-based coverage to help players understand gambling platforms, their features, and possible risks.
