Thunderstruck II Slot Review

The Thunderstruck II slot is one of the most popular online slots of all time. Released in 2010, this 5 reel, 243 ways to win game has a Norse mythology theme and can be played from 30p a spin on all devices. It benefits from a randomly-activated Wildstorm feature where up to 5 reels can turn fully wild.

It’s all about The Great Hall of Spins where you can play 4 free spins features based on Thor, Odin, Loki and Valkyrie. They offer you 5x multipliers, Wild Magic symbols for random wilds, Odin’s Ravens for multipliers up to 6x and Rolling Reels with consecutive wins increasing the multiplier up to 5x. You can win a whopping 8,100 times your stake from each Loki free spin and the Wildstorm feature.

Where to Play Thunderstruck II Slot


up to £50


Free Spins



T&C Apply

18+ new players only. Maximum £50 bonus. Minimum deposit: £20. Max bet with active bonus: £2. Wagering requirement 100% match bonus: 30 times sum of deposit + bonus. Winnings from Free Spins come as cash. Some games may not be played with an active bonus. Games may contribute differently when wagering a bonus.


up to £100





T&C Apply

New players only • £88 is granted in FreePlay (FP) • FP must be claimed within 48 hrs of receiving the email and expires after 14 days • FP wins are credited as bonus and capped at £15, exc. JP win • Bonus wins are capped at £500 • To withdraw bonus & related wins, wager 30 x (bonus amount) within 90 days • Wagering req. vary by game • This offer may not be combined with any other offer • Deposit balance is available for withdrawal at any time • General withdrawal restrictions & full T&Cs apply.


up to £150





T&C Apply

First Deposit Only. Min. deposit: £20, max. Bonus £150. Game: Starburst, Spin Value: £0.10. WR of 60x Bonus amount and Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.30) of the free spin winnings and bonus amount or £5 (lowest amount applies). Free Spins must be used before deposited funds. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonus Policy applies.

Bonus Features in Thunderstruck II

The Thunderstruck II slot has a wealth of bonus features with 8 in total. There are random wild reels as well as 4 free spins features which are based on mythological characters Valkyrie, Loki, Odin and Thor. Each of them offers their own features such as multipliers, transforming symbols and rolling reels.

Wildstorm feature

Thunderstruck II slot - Wildstorm feature

The Thunderstruck II casino slot comes with a randomly triggered Wildstorm feature. Once activated, Thor will use lightning bolts to transform between 1 and 5 reels into wild reels. If you manage to get 5 wild reels, you would win 8,100 times your total stake.

The Great Hall of Spins features

Thunderstruck II slot - The Great Hall of Spins features

The Thunderstruck 2 slot is all about The Great Hall of Spins – this is accessed by getting 3, 4 or 5 Thor’s Hammer scatters. 2, 3, 4 or 5 scatters anywhere in view will give you 1, 2, 20 or 200 times your total stake by the way. This is a multi-level free spins feature.

With 4 on offer, you can access various levels once you trigger The Great Hall of Spins a certain number of times. There is a progress bar to show you how many times you’ve entered it. Here’s what to expect:

Valkyrie Free Spins feature: this is available from the 1st trigger and gives you 10 free spins with a 5x multiplier. The good thing is that you can retrigger more free spins to give you 20 free spins in total. The max win per free spin is 1,383 x your stake.

Loki Free Spins feature: this is available from the 5th trigger and gives you 15 free spins. It benefits from the Wild Magic feature. Look out for Wild Magic symbols on reel 3 as this randomly transforms symbols into extra wilds. You can also win 1, 2, 3 or 4 more free spins for 2, 3, 4 or 5 scatters. The max win per free spin is 8,100 x your stake.

Odin Free Spins feature: this is available from the 10th trigger and rewards you with 20 free spins. The Wild Raven feature comes into play as Odin’s Raven symbols can randomly turn symbols into 2x and 3x multipliers. If both ravens land, you’ll benefit from a 6x multiplier. This can lead to 3,320 x stake wins per free spin.

Thor Free Spins feature: this is available once you enter The Great of Hall of Spins 15 times. You’ll get 25 free spins with the Rolling Reels feature. When you get a winning combination, the multiplier increases to 2x. Subsequent wins will increase the multiplier up to 3x, 4x and finally 5x. The max win per free spin is 1,383 x stake.

Thunderstruck II Slot, Details & Wager Limits

The Thunderstruck II casino game comes with 5 reels, 3 rows and 243 ways to win. To form a winning combination, you need to land 3, 4 or 5 matching symbols on successive reels beginning from the first reel. For example, get Thor on reels 1, 2 and 3 in any position.

The stakes suit all pockets as you can play Thunderstruck II from as little as 30p to as much as £15 per spin. There is a very basic Auto Play function where you can choose from 10, 25, 50 or 100 autospins. In the Settings section, there’s also a Quick Spin option.

Despite Thunderstruck II’s popularity, it’s actually a low variance online slot. This means you’ll get plenty of smaller sizes wins very frequently. When you trigger the random Wildstorm feature, it will normally consists of 1 or 2 wild reels. The bigger wins come from the free spins features but will be infrequent.

The max win per free spin is 8,100 x your stake. This can be achieved on each free spin in the Loki Free Spins feature or the Wildstorm feature.

Thunderstruck II slot RTP

The Thunderstruck II Return to Player rate (RTP) is 96.65%. This is high for an online slot. You’ll get back £96.65 for every £100 you stake on average. Being a low variance game, you should get plenty of wins frequently which will stretch out your balance. The hit frequency is 32.62% meaning that nearly 1 in 3 spins will result in a winning combination.

Thunderstruck II Theme - Audio and Design Features – head to the realm of Asgard

Thunderstruck II slot - base game

With a Norse mythology theme, Thunderstruck II focuses on the Norse God of Thunder. You join Thor on his journey with other ancient Norse gods in the realm of Asgard. With an epic soundtrack playing as you spin the reels, the graphics and animations are a little dated as Thunderstruck II was released in May 2010. Saying that, it has a nostalgic charm to it and works in its favour.

Symbols on the reels include A, K, Q, J, 10 and 9 playing cards as well as viking longships. You’ll also come across Nordic gods Valhalla, Valkyrie, Loki, Odin and Thor. Thor is the most rewarding standard symbol giving you 16.67 times your total stake for 5 in combination.

The Thunderstruck II logo is the wild symbol and substitutes for all other symbols bar Thor’s Hammer (which is the scatter). When part of a win, it doubles your payout. 5 wilds on a payline will give you 33.33 times your stake – if you were to get 4 Thor symbols and a wild, you’d also win 33.33 times your stake. You will form wins by getting matching symbols from left to right.

There is a Thunderstruck II mobile slot as well as a desktop and tablet version. Being 1 of Microgaming’s most popular slots ever, it can be played on Windows, iOS and Android operated devices.

Thunderstruck II Review Summary – iconic online slot

The Thunderstruck II slot may be old but it’s still much-loved by slots and casino players. It’s all about The Great Hall of Spins as you can access the 4 free spins features. Once you’ve triggered it 15 or more times, you can opt for any feature you fancy.

The Loki Free Spins feature is the best one as it offers the biggest win potential, up to 8,100 x stake on every free spin. The random Wildstorm feature can also deliver the same payouts.

Thunderstruck II may be old but it’s still 1 of the best online slots ever. A similar slot in terms of gameplay is Immortal Romance which has a vampire theme but uses the same game engine. It’s more volatile though with wins of up to 12,150 times your stake on every free spin in the Troy feature.

Thunderstruck II FAQs

What is the Thunderstruck II slot RTP?

The Thunderstruck II slot RTP is 96.65%. This is actually high for an online slot game. For every £100 you play, you’ll in theory win back £96.65. Being low variance and with a hit frequency of nearly 1 in 3 spins, your balance should go a long way when playing this old favourite.

What is the Thunderstruck II max win?

The most you can win from a Thunderstruck II slot spin is 8,100 times your total stake. This can be achieved in 2 ways – via the random Wildstorm feature or from a free spin in the Loki Free Spins feature. There are also high win amounts from the other free spins features.

Can I play Thunderstruck II on my mobile?

Yes – Microgaming originally released Thunderstruck II in May 2010 but has since revamped it using HTML5 technology. This means it can be played on mobile devices as well as tablets and desktops. If you’re chosen device uses iOS, Android or Windows, you can play.

Are there any Thunderstruck II free spins?

Yes – Thunderstruck II comes with 4 free spins features which are chosen from The Great Hall of Spins. Based on gods Thor, Loki, Odin and Valkyrie, each of them has their own number of free spins and modifier including rolling reels with increasing multipliers, 5x multipliers, a Wild Raven feature where multipliers can combine up to 6x and Wild Magic symbols which transforms symbols into extra wilds.

Thunderstruck II Slot Information

  • Game:
    Thunderstruck II
  • Software:
  • Type:
    Video Slot
  • Reels:
  • Paylines:
  • Total Coins:
  • Coins Range:
    0.30 to 15.00
  • Jackpot:
  • Bonus Round:
    Yes (8)
  • Free Spins/Multiplier:
  • RTP %:
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.