Whichever set of reels you play, you won’t find the prizes coming thick and fast as this is a slot with medium volatility and a RTP rate of just 94.38%, putting it into one of the lower categories. As well as the extra reel, Big Thunder offers more chances to scoop a big payout, but you’ll have to be very lucky to win. Big Thunder is a five reel online slot that offers 30 different paylines. The minimum coins size allocated for the slot is 0.01, and the maximum range goes up to 100. Gorilla is the wild that substitutes other icons excluding the Big Thunder scatter and the King Strike. The Gorilla icon only lands on reel 3, 4 and five during the paid games.
Getting Started
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While Big Thunder has a pretty simple look and feel to it overall, there are some features that may be a bit confusing to players who haven’t played the game before. The game uses a bonus bet system that gives you more chances to win. Here’s a quick rundown of how the Big Thunder casino game works:
- There are five reels and three rows for a total of 15 symbols on the reels after each spin.
- This game has 30 fixed paylines.
- Payouts are made on matches of 3 or more symbols of a kind on a payline.
- A King Strike symbol appears on a separate sixth reel and gives you a chance at larger King Strike wins. These wins are €5, €10, €25 and €100.
- The “+” button next to the spin button allows you to automatically play up to 25 spins or play until you’ve won or lost a certain amount.
Features & Overview
Big Thunder is a nice simple slot game and the bonus bets feature is great, but it follows in the footsteps of many of Ainsworth’s games with the lack of presentation. There aren’t a lot of sounds in the game and the graphics look a bit cookie cutter if you’ve played other Ainsworth poker machines.
Aside from this, the average player should be happy with Big Thunder. It’s a pretty basic slot game and that’s reflected in the interface. You can find detailed information about payouts and features by clicking the settings button. Another nice feature of Big Thunder is the ability to bet small. You can bet as little as €0.01 per line for a total minimum bet of €0.30, which is perfect if you don’t want to lose too much.
Bonus Rounds
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There is a Bonus Reel feature in Big Thunder which is triggered when three Big Thunder symbols appear anywhere on the board. During this feature, there is an extra reel with x3 and x5 multiplier symbols and the Big Thunder symbol. When you land one of these symbols on the bonus reel with a win, your win will be multiplied. This feature is active for 15 spins no matter how many symbols you land to trigger it, although you can win an additional 5 spins for landing 3 Big Thunder symbols during the feature.
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The King Strike bonus is sort of an addition to the standard payline wins. These wins only occur when you get a payline win with no substitute symbols and a King Strike symbol appears on the bonus reel to the right. Only payline wins with five of a kind will trigger the King Strike bonus, and the payout will depend on the symbol. You can win €5, €10, €25 or €100.