Besides, five Rams gathered in any spot pay out x500 times your total bet. The feature can be re-triggered with 15 extra spins if 3+ scatters appear again during the free games. Thunderstruck is probably one of the most popular slots from Microgaming. It came out in 2004 and it significantly contributes to the Microgaming’s fame. The game is using Scandinavian mythology theme with Thor God as the main character.