Thunderstruck II is a far more sophisticated beast than the original. The reels contain a similar selection of Norse-inspired imagery but the cartoon-style visuals have been ditched in favour of more detailed 3D offerings. Very impressive they are too. Likewise the soundtrack which has a sweeping cinematic feel.
The features have been given a major overhaul too. First there's the Wild Storm Bonus feature. Triggered at random, this feature turns up to 5 reels into wild reels offering the prospect of some very healthy payouts – there’s a maximum of 4,050 times your stake to be won here!
The chief attraction though is the Great Hall of Spins Bonus feature which is triggered when 3 or more Bonus Hammer Scatter symbols appear on the reels. There are four levels to this feature, each of which can be unlocked after the Bonus feature has been triggered a certain number of times.
Starting things off is the Valkyrie feature which is always available. This gives you 10 free spins complete with a 5x multiplier on all wins. If more Bonus Hammers appear, free spins can be re-triggered. There’s a maximum of 691 times your stake to be won here (on each spin).
After you've unlocked the Great Hall of Spins 5 times, you'll be able to play the Loki feature. This awards 15 free spins. If the Wild Magic symbol appears on reel 3 it will turn up to 14 symbols into wilds. Once again free spins can be triggered with the Bonus Hammer. There’s a huge 4,050 times your stake to be won making it potentially the most rewarding.
Next comes the Odin feature which is available after Great Hall of Spins has been activated 10 times. 20 free spins are awarded complete with the Raven feature where random symbols are transformed into wilds with a multiplier. You can boost your winnings by up to six times here – there’s a maximum of 1,660 times your stake to be won.
Finally there's the Thor feature which opens after the Great Hall of Spins has been triggered 15 times. Here you'll be awarded 25 free spins, this time with Rolling Reels. After any winning payline, the successful symbols will disappear to be replaced by the symbols above. As long as they keep forming a winning combination they will keep on exploding, each time increasing the multiplier. Get on a roll here and you can boost your winnings by 5x up to 691 times your stake.
The first Thunderstruck proved a huge hit with slots fans and thanks to its stunning visuals and array of features, its successor has followed suit. More complex it may be, but Thunderstruck II has retained the central elements that made the original such a success.
The variance is high so expect plenty of dry spells. It is possible to win big though, especially via The Great Hall of Spins feature which is a fine addition. Get those Rolling Reels rocking and you can secure a bucket of coins that even Thor would struggle to carry. I would also recommend Immortal Romance which is an improved version of Thunderstruck II in my opinion – however, it’s not available to play on mobile and tablet devices like Thunderstruck II. If you like Norse mythology-themed slots, Hall of Gods by NetEnt is a great game with a progressive jackpot element.