Thunderstruck II Slot Review

by Nick Taylor Last Updated
  • Key Features
    • Return to Player Percentage: 96.65%
      The percentage of all the wagered money will this slot machine pay back to players over time.
    • How Many Reels: 5
      The number of reels this slot game has.
    • How Many Paylines Are Available: 243
      How many paylines are available?
    • Minimum Wager: 0.30
      The minimum amount of money you can bet on this slot game.
    • Maximum Wager: £30
      The maximum amount of money you can bet on this slot game.
    • Maximum Payout: 2.4 million coins
      What is the maximum this slot game can payout?
    • Can You Play For Free: Yes
      Do online casinos make this slot game available for free?
    • Are There Bonus Rounds: Yes
      Does this slot game extend bonus rounds and/or free spins to players.
    • Progressive Jackpot: No
      Is this slot game a progressive or part of a progressive jackpot network?
    • Compatibility: Mobile + Browser
      Which devices this slot game be played on?

Where to Play Thunderstruck II


100% up to £100

+ 300 Free Spins

T&Cs Apply

18+ Full T&C's Apply. New UK players Only. £10 min. deposit. £5 max. bet using Bonus. 40 x wagering applies. Bonus valid for 14 days. 30 Spins on pre-selected games will be credited instantly + then 30 per day for 9 days. Free Spins valid for 72 hours from credit. Max. Free Spins winnings £100. Skrill + Neteller excluded.


100% Up To £100

20 Spins No Deposit

T&Cs Apply

New customers only, min deposit £20, wagering 35x, max bet £5 with bonus funds. Max bonus is 100% up to £100. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Skrill or Neteller. Cashback is cash with no restriction. Full T&C’s apply.


100% up to £100

+ 200 Free Spins

T&Cs Apply

The New Player Welcome Bonus is only available to players who create an account and make their first deposit at Casoola. You may only claim one Welcome Offer (Welcome Package or Live Casino Bonus). Once you have claimed one, you will not be eligible for the other. To be eligible to claim the New Player Welcome Bonus, players must deposit a minimum of £10 in one instance. The New Player Welcome Bonus will only be offered on your first deposit, unless otherwise stated. Players who do not wish to receive the New Player Welcome Bonus offer will have the option to opt out upon making their deposit. Players can only use the Bonus Codes from the New Player Welcome Package once. Players need to wager the Welcome Bonus 60 times before they can withdraw the Bonus or any winnings gained from it. For players that are referred by 3rd party affiliates or google adverts the wagering requirement is 40 times. 20 Free Spins will be instantly credited upon qualifying deposit. Remainder will be credited at the rate of 20 per day for 9 days on Reactoonz. Casoola reserves the right to change the pre-selected Free Spins game selection at any time, at its sole discretion. All Free Spins from the New Player Welcome Bonuses are valid for 72 hours upon activation, unless otherwise stated. The maximum withdrawal amount for a player from their Free Spins is £100. Deposits via E-Wallets (Skrill/Neteller/Paysafe/Paypal/Ecopayz), are not eligible for the New Player Welcome Bonus. The General Terms and Conditions of the Casoola website apply.


100% up to £100

+ 300 Free Spins

T&Cs Apply

Players can only have one active Bonus, at any one time. The minimum deposit to receive any Bonus is C$10 or the currency equivalent of 10 USD, unless otherwise stated. Free spins will be granted the day after the qualifying deposit by 12:00 GMT, unless otherwise specified. The minimum turnover to receive Free Spins is C$5 or the currency equivalent of 5 USD, unless otherwise stated.


100% Up to £200

+ 50 Spins

T&Cs Apply

New Customers Only. First Deposit only. Minimum Deposit £10 for Spins. Minimum 10 and Maximum 50 bonus spins on selected slots only. 2x Conversion, 20x wagering. Min Deposit £50 for 10% cashback on 1st deposit based on slot net losses for 24 hours. Max Cashback £200. Elk Gaming Slots excluded. Full T&Cs apply. Please gamble responsibly. Visit for more information.

What is Thunderstruck II

Thunderstruck II is an adrenaline-fueled slot game that makes you feel as though you’ve been zapped by Thor’s thunderclap! Pair that with huge jackpots, and we’re sure this is one game that’s worth your time – with 25 free spins and a 4x multiplier on your wins.

Thunderstruck II is a 5-reel, 9 line video slot game that offers an RTP of 96.65%. It was developed by Microgaming and has everything you would expect from the prestigious operator: great graphics, accompanied by sounds and effects reminiscent of popular Norse mythology. The graphics have been rendered using 3D, while all symbols were hand-drawn to offer the player an enthralling visual experience.

Thunderstruck II also has Wilds that work as substitutes for any other symbol in order to create more winning combinations for players. Read more about how your symbols can impact your game in the Strategies for Winning section below.

Discover the mythical Norse world of Asgard across 9 different levels, enjoy epic bonuses, and try your luck on jackpots worth millions of pounds. With exciting rewards, thrilling extras, and a majestic soundtrack, this dazzling slots game will be one you absolutely want to get your hands on!

If you’re ready to play now, we’d recommend trying these games on secure, reputable platforms like 888 Casino, All British Casino, and Casino Lab.

Thunderstruck II

thunderstruck ii wild image
The Wild symbol is activated, giving players increased odds of winning big on each spin.
Thunderstruck II Bonus Img
The bonus hammer is the golden ticket for Thunderstruck players, leading to a potentially huge multiplier and the end of the game.

Pros and Cons

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  • green check mark
    243 different paths to winning – perfect for beginners
  • green check mark
    Magnificent story and accompanying Norse mythological visual design
  • green check mark
    Great gameplay progression that rewards players in longer sessions
  • green check mark
    Potential for big wins through small bets
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  • red X
    Some special features are lacking a big payout

Play Thunderstruck II for Free

Let’s say you’ve heard about this awesome slots game, but you don’t want to jump right in with your entire monthly budget – at least until you have a better understanding of the game mechanics. Luckily, Microgaming does a great job of offering FreePlay versions of their popular slots titles, including the fabled Thunderstruck II.

Sites like Casino Lab offer a Free version of the game, and include every feature of the real money version – the free spins, the WildStorms, and Thor’s hammer – except for the actual real money betting. It’s a great way to familiarize yourself with each symbol’s function and the role of free spins in boosting your payout.

If you’re serious about diving into the celestial world of Thunderstruck II, we strongly advise that you give the free version a shot – you’ll be glad you did.

How to Play Thunderstruck II

Those who are familiar with online slots gameplay – or even Microgaming slots play – will require little education on how to play this game, but for those of you who are first-time online slots players, we’ll provide a quick summary of how to move through a single game.

Once you load up the game, you’ll need to deposit funds to begin spinning. You can do that by clicking the credits button (after depositing money into the casino’s Cashier page, of course). After funding your game account, you will set your coin bet (standard is 4) and your bet size. Your bet size can be adjusted with the plus (+) and minus (-) buttons on the bottom left-hand corner of the game screen. Now that your bets are set, it’s time to spin! Click the Spin button to begin a round, and spin until you get a winning combination. There are over 243 ways to win in Thunderstruck II, and the more you stop to recognize what you have, you’ll know what to look for when you’re spinning in the later rounds of your session. Keep reading to learn some secret strategies used by more advanced players…


Strategies for Winning at Thunderstruck II

Thunderstruck II can be a difficult game to crack, but there are plenty who have done it with the help of certain in-game strategies. Do a quick YouTube search, and you’ll find plenty of big winners from this game alone. Here are a few strategies we think you should try if you want to gain an edge on the house:

  1. Focus On Free Spin Bonuses

Thunderstruck II is a perfectly fun game in its own right, but it reaches a new level of excitement when you progress through the free spin bonuses and get to choose what bonus round you wish to play. This is where Microgaming introduces an element of surprise to player outcomes. If you land three or more Thor’s hammer symbols during a game, you’ll be able to choose your bonus. Some of these free spins bring very little in terms of profit, but there are some with 2x, 3x and even 5x multipliers on your payouts hidden in the mix. If you organize your entire strategy around racking up those bonus hammers and other valuable symbols, you’ll be given the opportunity to grow your payouts exponentially. This is not a guarantee, but in our opinion, this is the true X factor of the game.

  1. Leverage the AutoPlay feature

Slot games are so much easier to play with Autoplay, which allows for consecutive spins without player input. This allows you to examine the game without having to click Spin 100 times, and it also prevents you from any costly user errors. If you accidentally touch the keyboard while playing, Autoplay will ignore your hands and continue spinning for you. Leveraging AutoPlay to turn a small win into a big one in a short period of time, or for targeted sessions in search of maximizing free spins or symbols, will only increase your time value of money as you develop.


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