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Thunderstruck is the big daddy of action adventure slots and one of Microgaming's top performing slots.

What’s not to like? Fantastic visuals, the chance to win serious cash, free spins to add to your wins, a gamble round for the truly brave. And then there is Thor. Not quite the beefcake version as presented by Chris Hemsworth, but the hammer wielding kind who really means business.

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Mythology and ancient gods have long been a great basis for online slots: at we have reviewed many of them - such as King of Atlantis, Cleopatra, Book of Ra and Age of the Gods - almost exclusively excellent games.

Microgaming Thunderstruck is no exception to this rule of thumb.

It's an impressive game exuding the power and drama of the Norse god's mythology, with a highly dramatic soundtrack to match.

No deposit Thunderstruck gameplay

Thunderstruck is based on the Norse god mythology, and Thor himself in particular. The hammer wielding ancient God of thunder is also the wild symbol of the game.

Being a slot of a classic format, it's not hard to grasp the basic gameplay. We are talking about a five reel and nine payline slots, so it is highly suited even for a complete slot novice. But thanks to its Expert Feature, which offers a bewildering number of extra options, it's highly popular among more experienced players as well.

As always, the goal is simple: line up the symbols in winning combinations. You get some aid from the God of Thunder himself here, and if you look closely you will see that his hair blows in the wind every time he helps you out to form a winning combination. It is worth mentioning that any win featuring Thor as a symbol in it will be multiplied by 2x.

Every win can also be gambled, which means that you take the chance of doubling or nulling it. Click on the gamble button and feel the pulse rising. And what if you double the win? Do you have what it takes to go for another run then and possibly quadruple your win, or will you end the Gamble-mode by clicking collect?

Apart from the basic game mode, and the Gamble mode, you also have the Thunderstruck free spins mode. Spin in 3 or more Rams on the reels, and it is triggered.

Thunderstruck free spins mode

It is nothing unique to have a free spins mode, it can be seen in most slots on Microgaming casinos. But what sets Thunderstruck apart in this aspect is that you have a 3x multiplier active during the entire free spins round. It makes it a very interesting (read: profitable) part of the game!

Whenever you land 3 or more Rams during a spin, you will trigger the free spins mode and get 15 spins. You will also get scatter pays awarded before the free spins begin, and these are multiplied by the sum of your bet.

Now, all wins are multiplied by 3 during free spins, and you start with 15 spins. But if you spin in 3 Rams again, you will get another 15 free spins. During a very exciting round we managed to do so, and had 30 free spins to enjoy in total. This is far from unheard, which is another part of the explanation that no deposit Thunderstruck slots remain so popular at Microgaming casinos even though the successor is way more famous nowadays.

Microgaming Thunderstruck sound & graphics

The lower value symbols are 9, 10, J, Q, K and A, and the higher level ones include Rams, Thor's hammer. Thunder, Odin's Staff, and Valhalla. When it was first released, the graphics was a match to any slot out there. Compared to its sequel, Thunderstruck 2, the graphics pale though. But the cartoon-style renderings are timeless, and we'd like to say that they send out much more of a classic vibe, than one of a game with outdated graphics.

Payouts and RTP

It's Microgaming's policy not to reveal the RTP of all their slots, in contrast to e.g. NetEnt. But many calculations have been made by both player and expert analysts, putting Thunderstruck at 96.07-96.10%. This sum has also been published by one casino - BetVictor - where they list the house edge 4%.

Thunderstruck is a game that certainly won't change your life overnight even if you hit the jackpot, but it has quite decent payouts and - most importantly - is not a high variance slot, so expect regular wins to keep your interest (and bankroll) up for long.

This is what different combinations will award you in Thunderstruck:

10,000 coins for 5 symbols

Thor's Hammer
750 coins for 5 symbols

Odin's Staff
750 coins for 5 symbols

400 coins for 5 symbols

250 coins for 5 symbols

250 coins for 5 symbols

Aces and Kings
125 coins for 5 of the same symbol

Queens, Jacks, 10s or 9s
100 couns for 5 of the same symbol

The successor of Microgaming Thunderstruck

Thunderstruck was so popular with fans that Microgaming obligingly launched Thunderstruck 2 in 2010 which proved to be even more popular than the first. This version was also memorable for introducing a new type of bonus game and raising the bar for online video slots. We are talking about the Great Hall of Spins which gave you the option of 4 levels and added a Player Achievements section in which wins were tracked and saved in the pay table. 

Game Features of Thunderstruck II

Thunderstruck has 243 ways to win; you can play for 30 coins to 300 coins meaning that the minimum spin is 30p whilst the maximum spin is £15.00. As there are no pay lines, all you have to do is align symbols from left to right anywhere on the wheels to get a win. Along with the free spins and multipliers, a really cool feature is the randomly triggered WildStorm during which Thor’s lightening can turn up to 5 reels into Wild.

Great Hall of Spins

This feature is what makes Thunderstruck 2 the classic that it is; you go through different stages, unlocking additional chambers and win additional rewards. The progress bar at the bottom will tell you how many times you’ve triggered the feature but once you’ve done it 15 times or more, you can choose with character you want.

  • Valkyrie Level – 1st to 4th triggers: you will be rewarded with 10 free spins with a 5x multiplier. You can also trigger more free spins.

  • Loki Level – 5th to 9th triggers: you will be awarded 15 free spins with the Wild Magic feature. If you get Wild Magic symbols on reel 3, the symbols will be transformed into additional wilds.

  • Odin Level – 10th to 14th triggers: you will get 20 free spins with the Wild Raven feature. Get Odin’s Ravens will turn symbols into 2x or 3x multiplier. Get 2 of them to get a 6x multiplier.

  • Thor Level – 15th+ triggers: you will get 25 free spins with Rolling Reels. Consecutive wins will increase the multiplier from 2x to 5x.

Thunderstruck Tournaments

Thunderstruck got even better and went multiplayer. You can now play Thunderstruck as part of the slots tournaments at casinos like 32Red where all you do is download, if you haven't done so already, pick an alias and simply look for "tournaments" in the games lobby. From there you will see a range of games with different fees (sometimes known as "buy-ins") and start times

Given how popular this game is, it comes as no surprise that you can find it at just about any Microgaming site but as always, it’s good to sign up at recommended casinos that have been vetted. You don’t want to have to sign up and discover that the wagering requirements were so unrealistic, you are never going to be able to cash out.

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