Thunderstruck II, the sequel to the popular original, is a Microgaming slot game that was released way back in 2010. Since then, it has gone on to become one of the most popular online slot games ever amongst players. The graphics are slightly outdated now and the Norse mythology theme is not as unique as it once was when this game first came out, but it’s still as popular today as it was ten years ago due to its exciting bonus features and, in particular, its free spins bonus round.

Are you ready to visit Valhalla and the Norse Gods? If you want to enjoy playing a medium variance slot game with a huge free spins bonus round, then this is the game for you. Carry on reading to learn more about this slot game and the best online casino to play it at.

Gameplay, RTP, and Variance

This 5 reel slot, 3 row slot game features 243 paylines plus a huge free spins bonus round. Choose your coin size to get started playing. This can be between 0.01 and 20 per line and bets per spin start at just 30p per spin and rise to £15.

In this game, you’ll find yourself at heading towards Valhalla where the Norse gods reside. There are 15 symbols in total including playing card symbols, Valhalla and a range of the Norse Gods such as Odin and Thor.

Thunderstruck II has an RTP of 96.65% which is on the higher end when compared to other online slot games. This is a medium variance game and so you can expect to get average sized payouts at regular intervals.

The maximum win in the base game is 500x your stake and this can be won with any bet size. To achieve, this you must land 5 of the Thor symbols on your reels. The biggest win in this game is through the free spins feature where you can win up to 8,100x your stake per free spin.

There is an autoplay feature in Thunderstruck II which allows you to set your bet and the number of spins you want. You can then sit back as the game plays automatically. There is also a Max Bet function which allows you to quicken your gameplay further.


Symbol Number of symbols Win (x stake)
10, 9 5 100
4 10
3 5
Q, J 5 125
4 15
3 7
A, K 5 150
4 20
3 10
Bonus Symbol 5 200
4 20
3 2
2 1
Viking Ship 5 250
4 60
Valhalla 5 300
4 60
3 15
Valkyrie 5 350
4 80
3 20
Loki 5 400
4 80
3 20
Odin 5 450
4 100
3 30
Thor 5 500
4 100
3 30

Bonus Features

Thunderstruck II has 3 special features in total – a wild symbol, a Wild Storm feature and a free spins round.

The wild symbol is the Thunderstruck II game logo and this will replace other symbols on the reels to form new winning combinations and create bigger cash prizes. The only symbol on the reels it will not replace is the scatter symbol.

Another feature in Thunderstruck II is the Wild Storm feature. When it’s randomly triggered, Thor’s lightning bolts will transform up to 5 reels into wilds. Get the maximum 5 wild reels and you could potentially win up to 8,100x your stake.

Lastly, we have the free spins bonus round which is named The Great Hall of Spins. This is the big bonus game in this slot and the longer you play, the bigger these bonuses will be. To trigger this round, you must three or more scatter symbols which is Thor’s hammer. Every player will start at the Valkyrie level and after 4 triggers playing at this level, you’ll then move on to the Loki round from the 5th trigger and so on so forth.

Valkyrie – The first to fourth triggers will see you playing the Valkyrie round where you can win up to 1,383x your stake per spin. You will be awarded 10 free spins plus a 5x multiplier and there is the opportunity to retrigger spins, with 20 up for grabs.

Loki – The fifth to ninth triggers will see you playing the Loki round where you can win up to 8,100x your stake per spin. You will be awarded 15 free spins plus there is a Wild Magic feature that kicks in. Watch the third reel as this is where the Wild Magic symbols will land and turn into wild symbols to create more winning combinations and award cash prizes. Landing more scatter symbols on your reels will also award you more free spins with the opportunity to get a further 4 free spins.

Odin – The tenth to fourteenth triggers will see you playing the Odin round where you can win up to 3,320x your stake per spin. You will be awarded 20 free spins plus there is a Wild Raven feature that kicks in. The Wild Raven feature sees symbols being transformed into multipliers of 2x and 3x by Odin’s Ravens. Landing two ravens will award you a 6x multiplier.

Thor – From the fifteenth trigger, you’ll start the Thor round where you can win up to 1,383x your stake. Here, you’ll enter The Great Hall of Spins. You will be awarded 25 free spins plus a Rolling Reels feature. There is a multiplier attached to your wins which starts at 2x and increases with every winning combination up to 5x.

Mobile and Tablet Experience

Thunderstruck II is optimised for mobile play and adjusts its graphics for touchscreen devices, regardless of whether you’re playing or a mobile casino site or a native mobile app. It works well on both smartphones and tablets and you don’t have to sacrifice on quality. You can spin its reel on both Android and iOS devices.

Design, Graphics, and Sound

Thunderstruck II is 10 years old and although the graphics are a little outdated, it still looks good for its age. The game is based on the characters from Norse mythology and you will see plenty of the gods on your reels including Thor, Odin, Loki and Valkyries. These are some of the highest paying symbols on your reels, while the standard playing card symbols are the lowest value symbols. The reels are bordered by a dark blue Celtic design and epic music plays in the background as you spin the reels which works perfectly with the Norse God mythology of this slot game.


Thunderstruck II has been a fan favourite game for 10 years now and its popularity does not seem to be going anywhere anytime soon. Although the graphics are not as great as many newer slots on the market, it still has a great range of bonus features that are competitive with other slot games. It is not hard to see why this is one of the most spun Norse mythology themed slots with its range of entertaining bonus features and the chance to win up to 8,100x your stake in the free spins round.
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