Big Thunder Slot Online from Ainsworth

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Big Thunder

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Big ThunderIf you’re looking for bright colours, gigantic beasts, and adventure, you’re in luck. Big Thunder is a jungle-themed game with vibrant graphics and animated symbols. There are subtle sound effects instead of an imposing soundtrack, and they fit well with the theme of the game.

The online slot, sometimes known as Big Thunder King Strike, from developer Ainsworth has 3 rows, 5 reels, and 30 paylines. The RTP is 94.38%. The name of the game comes from the silverback gorilla, which appears as the wild symbol. There are plenty of other special features, including multipliers, scatters, and the King Strike reel.

Bonus Features

Let’s take a look at the unique aspects of the game that make it appealing.

Game Symbols

The slot has two paytables; a base game and a feature table. They have several symbols in common, such as the gorilla wild, which substitutes all icons except King Strike and the scatter. It appears on reels 3, 4, and 5. The scatter is the game logo, and it’s the most valuable. Landing 3 or more triggers the bonus game.

The other symbols are a waterfall, a snake, and tribal objects. In the base game, you’ll see the playing card icons A to 9 and the King Strike crown, which appears in a sixth reel on the side. In the feature round, there are 3x and 5x multiplier symbols.

Bonus Rounds & Free Spins

If you collect 3 or more scatters, you’ll trigger 15 spins in the bonus feature. The gorilla still acts as a wild symbol but it can’t replace the multipliers. The higher value paytable comes into play, so you could win big, especially as the amount could be tripled or multiplied by five.

The other bonus is the King Strike. There are mini, minor, maxi, and major bonuses up for grabs in the base game. The mini and maxi prizes are awarded when you land 5 playing card icons and the King Strike symbol in reel six; in the mini, you can have a wild as a substitute.

The minor and major have the same rules, except you’re looking for the picture icons, including the waterfall, snake, drum, shield, and mask.

Big Thunder Hits & Misses

The slot has many fun features, but a few disadvantages too. These hits and misses will help you determine whether it’s the game for you.

  • Hits

  • Four different jackpots
  • Excellent animated graphics
  • Packed full of features, including wild, scatter, and multipliers
  • Bonus round with the potential to win big
  • Misses

  • Jackpots are hard to trigger
  • Highly volatile, so patience is required for the bonus round
  • You need to increase your bet to get bigger jackpot prizes


The jungle theme and gorilla character make this game an adventure classic. There are enough features to keep you entertained, as there’s a second screen bonus round and jackpots in the base game. However, it’s a highly volatile slot that depends on bigger bets for better jackpots, so you could get through your bankroll quickly.

Conrad Brennan
Former Author
University of Toronto
BA of Business and Marketing
Expert in:
  • Games reviews
  • Slot reviews
Reviewed by Head of Content:
Dmitry Rogalchuk


What Is the Most Valuable Symbol in Big Thunder?

The most valuable symbol is the scatter, which is represented by the game logo.

What Is the Return to Player (RTP) Rate of Big Thunder?

The RTP is 94.38%.

How Can I Earn Real Cash Prizes in Big Thunder?

You’ll need to deposit and play the game at a real money casino. The game pays from left to right, meaning you need at least three matching symbols on a payline starting in the reel on the left.

Does the Big Thunder Slot Have a Jackpot?

The game has four jackpots: mini, minor, maxi, and major. You’ll see the amounts you can win at the top of the reels, and they change based on the size of your bet.

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