Thunderstruck II


Thunderstruck II is an older game in the Microgaming collection, but is still one of the company’s most popular titles. This slot game has been remastered so you can enjoy high-quality, updated graphics as you explore the Norse mythology theme. The spinning reels are emblazoned with god symbols depicting the likes of Loki, Odin and Thor, as well as Valhalla and Viking longboats, while the highlight of the slot game is arguably the Great Hall of Free Spins bonus round. The longer you play, the further you can climb through the four different levels, all with their own bonuses to discover. What’s more, players can get wild reels, and have the opportunity to win up to 8,100x their stake.

Are you ready to join the Norse gods in a quest for big cash prizes? If you want to play a high variance slot game with a huge free spins bonus round, this could be the slot game for you. Carry on reading if you want to learn more about this slot game and the best online casinos to play it at.

What we like

  • Top Microgaming slot
  • Wins of up to 8,100x available
  • Mobile-friendly slot game
  • Lucrative free spins bonus round

What we don't like

  • High variance won’t be suitable for all budgets
  • No big progressive jackpot to win


Gameplay, RTP and Variance


Thunderstruck II is a five-reel, three-row slot game with 243 paylines and an awesome Norse mythology theme. Bets per spin range from €0.30 to €15.
This game has an RTP of 96.65% which is above the average of slots games at 96%. As this is a high variance slot game, it’s designed to pay out infrequently and has the potential to offer large wins.

The bonus scatter symbol is the highest paying symbol on the reels and landing five will award 200x your stake.


Loki 5 13.33
4 2.66
3 0.66
Odin 5 15
4 3.33
3 1
Thor 5 16.66
4 3.33
3 1
Thunderstruck II logo wild 5 33.33
4 6.66
3 2.5
Bonus Scatter Symbol 5 200
4 20
3 2
2 1

Licence and Audit

Thunderstruck II is a Microgaming slot game that players all around the globe can enjoy playing. One of the world’s best-known software developers, Microgaming is licensed by reputable gaming bodies including the UK Gambling Commission and the Malta Gaming Authority. You can be rest assured that all games from this developer are fair as they are regularly tested by the auditor eCogra, of which Microgaming is also a founder.

Bonus Features


Thunderstruck II has three special features including a wild symbol, a wild storm feature that awards wild reels, and the Great Hall of Free Spins bonus round.

The wild symbol to watch out for is the game logo. This will replace other symbols on your reels to help form new winning combinations and award big cash prizes.

The wild storm feature is randomly triggered and players will watch as Thor sends lightning bolts down onto the reels, turning them into wilds. In total, players can get up to five wild reels with this feature and take home up to 8,100x their stake.

The highlight of Thunderstruck II is the Great Hall of Free Spins bonus round which is a huge free spins bonus round with four different levels to work through. The more you play, the quicker you’ll move through these levels that are named after each of the gods. To trigger this feature, you’ll need to land three or more Thor hammer scatter symbols on the reels.

  1. Level One Valkyrie – this round is in play from the first trigger to the fourth free spins trigger and players will receive 10 free spins and a 5x multiplier. There is the opportunity to get 20 free spins with retriggers and players can win up to 1,383x their stake during this round.
  2. Level Two Loki – this round is in play from the fifth trigger to the ninth free spins trigger and players will receive 15 free spins and a wild magic feature that helps to create more winning combinations. In this round, players can get up to four more spins by landing extra scatter symbols and there is 8,100x your stake up for grabs.
  3. Level Three Odin – this round is in play from the tenth trigger to the fourteenth and players will receive 20 free spins and the wild raven feature. Watch as ravens come onto the reels and turn random symbols into multipliers of 2x and 3x. Get more than one raven landing and these can be combined to give you 6x and award up to 3,320x your stake.
  4. Level Four Thor – this round is in play from the 15th trigger onwards and players will receive 25 free spins and an increasing multiplier will be in play. This starts at 2x and increases by 1x each time a winning combo is formed up to a maximum of 5x. In this round, you can win up to 1,383x your stake

Mobile and Tablet Experience


Thunderstruck II is a slot game that can be played on mobile and tablet devices as the graphics will adjust to fit smaller screen sizes. You can access this game anytime, anywhere from both iOS and Android devices.

How Does it Compare to Other Microgaming Titles?

Since its release, Thunderstruck II has been one of Microgaming’s top titles. However, this software developer has a huge library of exciting slot games to play that may provide you with a similarly impressive gaming experience.

If you’re a fan of the hit television series Game of Thrones, you can’t go wrong spinning the reels of the official slot game developed by none other than Microgaming. There are five reels, 15 paylines and 243 ways to win. On the reels, you’ll spot house banners from the Starks, Lannisters, Targaryens and Baratheons. This is also a game with lots of bonus features including a big free spins bonus round, like Thunderstruck II. Players can choose which free spins mode they play in, each of which is named after one of the houses, and these modes provide not just free spins but also multipliers up to 5x. There are much bigger wins up for grabs in this game compared to Thunderstruck II, as players can potentially take home up to 20,250x their stake.

Mermaids Millions is another older game in Microgaming’s collection but it’s still a firm favourite with slots fans. This is a five-reel, 15-payline slot game that comes with lots of simple but lucrative bonus features. As you dive deep into the ocean, you’ll uncover wild symbols, a treasure bonus picking game that awards cash prizes, and a free spins bonus round where all wins are subject to a 3x multiplier. In terms of potential winnings, this game isn’t quite up there with Thunderstruck II as you’ll only potentially get maximum wins of 1,500x your stake. But it’s a good option for those who want a simpler gaming experience.

How Does it Compare to Other Slots on the Market?

The Norse mythology themed slot game market is certainly crowded. As one of the earliest examples, Thunderstruck II has been able to stay on top over the years, but there are other great slot games available to fans of this genre, including Age of the Gods and Viking Runecraft.

Age of the Gods is a five-reel, 20-payline slot game from Playtech that has become so popular that a whole series of Age of the Gods slots have been released. This game has a similar Norse god theme to Thunderstruck II, even down to the symbols on the reels representing different gods. In this game, players can look forward to instant cash prizes thanks to the Pantheon of Power feature and a big free spins bonus round with added multipliers that can award up to a massive 30,000x your stake. Not only is the maximum win in this game higher, it also offers progressive jackpot prizes. If players win the ultimate power jackpot, they’ll take home a minimum prize of €10,000.

Another fantastic slot game players will love is Viking Runecraft from Play’n Go. This is a slot game played on a 7×7 grid, using cascading reels to provide lucrative, ongoing wins. Each time you get a winning combo in this game, it charges the metre which then awards cool bonus features that help you create more winning combinations. There’s also the Ragnarok feature that awards big multipliers of up to 15x. On top of all that, there’s the Gifts of the Gods feature that triggers randomly and can award four more perks involving the wild symbol. If you love slot games jam-packed with bonus features, then this will be a great option, and the maximum win is 5,000x your stake.

Design, Graphics and Sound


Thunderstruck II has recently been remastered by Microgaming to bring the graphics up to the same quality that players expect from new slot games. On the reels, the standard playing card symbols act as the lower value symbols while the higher value symbols relate to the epic and immersive Norse theme. As you spin the reels, you can enjoy epic music that really adds to the atmosphere of the game, and if you listen closely you’ll even hear the smashing of Thor’s hammer.

Questions and answers

  • If I enjoyed playing Thunderstruck II, what other slots will I like?

    If you’re looking for other slot games in the Norse and Viking genre, the good news is there are plenty to choose from. Top titles include Valhalla, Viking Runecraft, Viking Pays, Vikings Go Berzerk and Age of Asgard.

  • What other Microgaming slots can I play?

    Microgaming has one of the biggest libraries of slot games around. Its games include popular titles like Big Bad Wolf, The Dark Knight, Jurassic Park, Hot as Hades, Pollen Party and Alaskan Fishing.

  • Can I use free spins to play Thunderstruck II?

    Thunderstruck II has an incredible free spins bonus round named the Great Hall of Free Spins where players can work their way through four levels to get up to 25 free spins and other great features for the duration of the round.

  • Is there a sequel to the Thunderstruck II slot?

    Players can enjoy spinning the reels of the original Thunderstruck slot game or you can check out Thunderstruck Wild Lightning that has jackpot wins of up to 15,000x your stake.

Similar Games to Try Out

Thunderstruck Wild Lightning – Players can spin the reels of the exciting sequel to Thunderstruck II, Thunderstruck Wild Lightning. This is a five-reel, 40-payline slot game from Microgaming with even better graphics than its predecessor. This game is bursting with bonus features including wilds, multipliers up to 12x, a free spins round with three different modes to play in, and the chance to win four thunderball jackpots. With the latter, players can potentially win a mega jackpot prize of 15,000x their stake. Spin its reels from just €0.20 today.

Valkyrie – Valkyrie is a five-reel slot game with up to 1,024 ways to win from the developers at ELK Studios. This game features fantastic graphics and on the reels you’ll find many of the female Norse gods including Freya, Helena, Tyrsa, Andora and Gane. Players can look forward to simple gameplay with wild symbols, scatter symbols and an exciting Valhalla free spins bonus round where you’ll receive up to 10 free spins that can be retriggered to give you unlimited free spins. There are also three special features that award sticky wilds, wild reels and colossal symbols. Play today from €0.20 per spin.

Vikings Go Berzerk – Vikings Go Berzerk is a five-reel, four-row and 25-payline slot game from Yggdrasil. Players will be transported to a Viking longboat as they head off to war and to win big cash treasures. In this game, players can look forward to wild symbols, a treasure chest feature that awards instant bonus prizes or free spins, and a golden treasure feature where you can win up to 400x your stake. There are also big free spins bonus features where you can play with sticky wilds and other special features to win up to 4,000x your stake. Spin its reels today from just €0.25.



Thunderstruck II is near the top when it comes to the most played slot games of all time, and this should be reason enough to check it out if you haven’t already! The title has reached iconic status and it’s great to see that Microgaming has updated the graphics to make it even better for 2021. Highlights of the game include the wild reels and, of course, the big free spins bonus round where the more you play, the further you can progress through the four levels. It’s also a potentially lucrative slot game with wins of up to 8,100x potentially available.

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