Wilds
In Thunderstruck II, Wild symbols can replace all other symbols except for Scatter symbols, and when they do substitute, they double your winnings.
The Wildstorm Feature
This feature can randomly trigger, transforming up to 5 reels into Wilds. However, it's important to note that free spins cannot be activated while the Wildstorm feature is active.
Scatter Symbols and the Great Hall of Spins
To gain entry to the Great Hall of Spins, you must land 3 or more Scatter symbols on the reels. This will unlock 4 free spins, and securing more entries can reveal additional bonus features.
10 Free Spins
From the first activation, you can earn 10 free spins. Keep in mind that these free spins can be retriggered multiple times, and any wins incurred during this time will be multiplied by a factor of 5.

The Wild Magic Feature
The Wild Magic symbol, if it appears on the third reel, can transform up to 15 symbols into more Wild Magic symbols, which can activate as many as 15 free spins. This bonus feature is available starting from the fifth trigger.
The Wild Raven Feature
With this feature, you can earn up to 20 free spins. Odin's ravens can also appear on the reels, turning 1 or 2 symbols into Wilds. The transformed symbols will carry a 2x or 3x multiplier. If both ravens hit the reels simultaneously, they deliver a 6x multiplier.
Rolling Reels
This particular feature becomes accessible only after the 15th trigger. Its mechanics involve removing winning symbols to clear the way for new ones, potentially leading to additional victories. This feature comes with a multiplier trail.