Big Thunder King Strike Slot Review

Take a volatile trip to the jungles of Africa in the Big Thunder King Strike slot, a 5 reel, 30 payline game from Ainsworth. Trigger the Free Games feature and you’ll play up to 30 free spins. Look out for the special 6th Bonus Reel. You could see 3x or 5x symbols here which deliver multiplier boosts to your total payout from that free spin. There are also opportunities to land 4 different jackpot prizes. Find out more about this high variance trek in our deep dive Big Thunder King Strike review.

Where to Play Big Thunder King Strike Slot

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Big Thunder King Strike Slot RTP, Details & Wager Limits

The Big Thunder King Strike slot is a 5 reel, 3 row, 30 payline game. To create a winner, land 3 or more of the same symbol or wild across a payline from left to right, starting from reel 1.

Stake levels here start at 30p per spin and rise to a maximum of £3,000 per spin. To adjust, click on the settings button then move the slider. It’s a bit of a fiddly process and not ideal for the fat-fingered among us. Click on the + next to the spin button for autoplay where you’ll be able to set up to 100 autospins.

The gameplay here might be rather simple but this jungle trek is a volatile one. The volatility is high. That’s not a description that can be used for the RTP here though. The Big Thunder King Strike RTP is 94.38% which is well below average. That’s very low when most slots manage to get above 96% and sometimes well beyond.

The max win is 10,000 x your total stake per spin. This can be won in the free spins where a potential 5x multiplier can apply.

Theme – Audio & Design Features – head to the jungle


The colourful visuals in the Big Thunder King Strike slot are simply done. With a jungle theme, it has a feel of a land-based casino slot. That’s because it is. The design isn’t the most sophisticated you’ll see but it does the job.

The soundtrack is rather generic. You’ll hear roars from the gorilla when you land a win that includes a wild and claps of thunder when the scatter lands. The rest of the soundtrack are the bangs and bleeps you’ll find in many brick and mortar casino slots.

With dense jungle foliage in the background, you’ll see A to 10 royals on the reels alongside a tribal drum, waterfall, face mask and shield. The snake is the most lucrative standard symbol. Land 5 of them on a payline and you’ll slither away with a payout equal to 5 x your total stake.

The rather sulky looking gorilla is the game’s wild. This can appear on reels 3, 4 and 5 in the base game and all 5 reels during the free spins. It substitutes for all the standard symbols.

Big Thunder King Strike is available to play on all types of devices including computers, tablets and smartphones. The no-frills design and simple gameplay make the Big Thunder King Strike mobile slot an easy one to play.

Big Thunder King Strike Features

Like most slots in the Ainsworth catalogue, there’s nothing overly complicated about the gameplay in Big Thunder King Strike. The best opportunities come via the free spins where the Bonus Reel multipliers can boost payouts by 3x or 5x.

Free Games feature


The Big Thunder logo is the game’s scatter symbol. Land 3, 4 or 5 Big Thunder logos anywhere on the reels on the same spin and you’ll activate the Free Games feature. Your reward is 15 free spins.

To the right of the main machine, you’ll see a single Bonus Reel. Known as the Bonus Reel feature, this 6th reel spins independently on each free spin and can include Big Thunder, 3x and 5x symbols. If you land 1 of the 2 multiplier symbols, your total payout from that free spin is boosted by the multiplier amount shown.

Retriggers are possible here too. Landing 3 or more scatter symbols on the same free spin will add another 5 free spins to your total.  Up to 30 can be won in total.

More importantly, a modified paytable is used during the free spins. The waterfall symbol is now worth up to 10 x your total stake (for 5 in combination). The gorilla wild is worth 66.67 x your total stake for 5 in combination.

A screen full of gorilla wilds will pay 2,000 x your total stake. Add in the potential 5x multiplier from the Bonus Reel and you could land a 10,000 x stake payout on each free spin.

King Strike Bonus feature

The King Strike Bonus feature gives are 4 fixed jackpot prizes that can trigger on any base game spin. They are awarded by landing a 5 of a kind combination alongside a King Strike symbol on the 6th reel. Which jackpot is awarded depends on which symbol made up your 5 on a line combo and whether than combination included a wild. Here’s what they pay:

  • Mini Jackpot = 16.66 x your total stake
  • Minor Jackpot = 33.33 x your total stake
  • Maxi Jackpot = 83.33 x your total stake
  • Major Jackpot = 333.33 x your total stake

Big Thunder King Strike Review Summary – land-based favourite

This jungle trek is a rather basic one. That’s true of both the design and the gameplay. Simple it may be but the Big Thunder King Strike slot can deliver some potentially big action courtesy of the Bonus Reel in the free spins.

The decent allocation of up to 30 free spins combined with potential 3x and 5x multipliers make the Free Games feature well worth landing. The quartet of potential jackpot prizes liven up the base game too.

There have been plenty of Big Thunder slots in land based casinos and they have a cult status. This isn’t a game I will be rushing back to play again as it does look dated. If you want jungle adventures, the Gonzo’s Quest Megaways slot by NetEnt tops the bill and comes with big wins and plenty of bonus features.

Big Thunder King Strike FAQs

What is the Big Thunder King Strike RTP?

The Big Thunder King Strike return to player rate is 94.38%. This is on the low side compared to most slots but average for a land based game. The variance is extremely high though.

What is the Big Thunder King Strike max win?

The most you can win is 10,000 x your total stake per spin. This can be won in the free spins as the Bonus Reel can add a multiplier up to 5x.

Is there a Big Thunder King Strike free spins feature?

Yes, the Free Games feature begins with 15 free spins. There’s a Bonus Reel which can give you multipliers up to 5x. You can also win additional free spins.

Is Big Thunder King Strike a jackpot slot?

No, Big Thunder does offer 4 fixed jackpots which can be won by landing a 5-of-a-kid win plus the King Strike symbol on the 6th reel. Known as the King Strike Bonus feature, the Major Jackpot pays 333.33 x stake.

Big Thunder King Strike Slot Information

  • Game:
    Big Thunder
  • Provider:
  • Type:
    Video Slot
  • Reels:
  • Paylines:
  • Stakes Range:
    30p to £3,000
  • Bonus Features:
    Yes (3)
  • Free Spins/Multiplier:
  • RTP %:
  • Max Win:
    10,000 x
Review by Chris Taylor

Review by Chris Taylor

Chris is a slots expert that has reviewed and played over 4,000 online slots. Having being in the iGaming industry for over 16 years, he knows how slots work, how bonus features are triggered and how the RTP and variance affect the gameplay.

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