Thunderstruck Online Slot Review

Thunderstruck is one of the oldest online video slots. It’s also one of the most popular, and that popularity has endured for close to 20 years at this point. Even today, in a world of 3D slot machines, vast progressive jackpots, and animated features, Thunderstruck still holds its own and is a very entertaining slot game.


Game Type5 reels, 3 rows, and 9 paylines
ThemesNordic Gods, Myths
Max Bet$90
Min Bet$0.09
Release Year2003

The Thunderstruck reels are set against an ominous sky backdrop, with rays of light peeking through dark rain clouds and threatening storms. The reels are filled with symbols taken right out of Nordic myth, including Thor, the thunder god himself, and Thor’s hammer, Mjollnir.

There are 9 paylines and all of these go from left to right.


If you’re looking for a piece of iGaming history that never fails to disappoint, Thunderstruck could be just the ticket. With CA casinos, you don’t even need to wager real money to experience it. All online Casinosin CA members can play in demo mode—there’s no risk, no wagers, and all the fun!

To make a start, just scroll to the top of this page to sign up at a legal CA casino.


When you’re ready to play Thunderstruck for real money, simply sign up, log in, and start playing. But before you do, you should check our latest promotions and offers. All new  CA players are entitled to a Welcome Package, and the credits/spins from this bonus can be used to play slots like Thunderstruck.


You can win as much as 30,000x in the Thunderstruck Free Spin feature and this drops to 10,000x during the base game.


  • Coin Sizes: You can bet as little as $0.01 on all of Thunderstruck’s 9 paylines, creating a minimum bet of $9. This increases to $10 per line or $90 in total.
  • Symbols:
    • Main: Mjollnir, Staff, Castle, Lightning, Horn
    • Standard: Playing Card Symbols (9 to A)
    • Wild: Thor
    • Scatter: Two Rams Scatter
  • Additional Bonus Rounds:
    • Wild: Thor is the game’s wild and rewards the biggest win. All paylines in which Thor appears are also doubled and it’s possible to win with just two consecutive Wild symbols.
    • Free Spins: The Two Rams Scatter symbol triggers a bundle of 15 free spins. An instant payout is also awarded.
Symbol2 on a Payline3 on a Payline4 on a Payline5 on a Payline
Rams Scatter2x5x20x50x

In Norse mythology, Thor’s chariot is pulled by two rams: Tanngrisnir and Tanngnjostr. The legends say that Thor killed and ate the rams to gain sustenance from their flesh, before using his hammer to resurrect them.

The two goats and the hammer play an important role in the Thunderstruck slot. The goats act as the game’s Scatter symbol, triggering an instant win when 2 to 5 are revealed and 15 free spins with 3 to 5. As for the hammer, it rewards some of the biggest payouts and is second only to the Wild.

During the free spins, all wins are tripled, making the wild and the Mjollnir Hammer even more powerful. The spins will also trigger again if three or more scatters appear on the reels when it is active.


Thunderstruck hit the market four years before the first iPhone was released. The developers couldn’t have known how popular mobile gaming would have become, or even if it would be a thing, and so the early iterations of Thunderstruck weren’t mobile-ready.

A lot has changed since then, though, and the Thunderstruck slot game now looks great on mobile. It’s fast, smooth, and simple. And the fact that it’s an old-school slot that’s not weighed down by big graphics and features means that you can enjoy it even on older devices.


Thunderstruck has an RTP of 96.1%.

In the Free Spins feature, it’s possible to win as much as 30,000x per spin as all wins are tripled.

The Thor Wild symbol triggers some of the biggest payouts in the base game and will turn a $0.90 stake into a $1,000 payout. You can see a full list of payouts in the game’s paytable. All of the amounts shown within are fixed according to your current stake.

Thunderstruck was created before mobile casinos were a thing, but it has been adapted over the years and can now be played on mobile devices.


Thunderstruck was so popular that it inspired a sequel. Thunderstruck II was bigger, bolder, and brasher. It took everything that made Thunderstruck a popular slot game and dragged it into a new age. But despite that evolution, the original Thunderstruck is still one of the best slot games out there right now and you can play it  at legal CA casino sites today.