Thunderstruck

Thunderstruck launched in 2003 and is one of Microgaming's oldest slots still available through Games Global. It uses a 9-payline, 5×3 reel structure — a format common to the early 2000s before the 243-ways and cluster-pay formats took hold. The Norse mythology theme centres on Thor: lightning bolts, hammers, Viking helmets, rams and Celtic horns fill the reels.

Thor is the wild symbol and pays 2× on any win it completes by substitution — a consistent feature that Microgaming carried into Thunderstruck II (2010) and several other Norse-themed titles. Three or more ram scatter symbols trigger 15 free spins with a 3× multiplier on all wins. The round is straightforward: no mode selection, no escalating multiplier, no stacked wilds — just 15 spins at 3× standard.

Thunderstruck is not a complicated game. By 2026 standards it is minimal — nine paylines, one bonus feature, no jackpot tier. Its continued presence in operator catalogs reflects brand continuity (players searching for the famous Thunderstruck II sometimes land on the original) and the steady low-maintenance audience for classic-format games.

Thunderstruck I versus Thunderstruck II

Thunderstruck II (2010) is a substantially different game — 243 ways, four distinct Chamber of Spins bonus modes, a Wild Storm random feature and significantly more production depth. The original Thunderstruck predates all of that. If you are looking for the 2010 sequel with the four-chamber bonus system, the game you want is Thunderstruck II, not this one. The original has simpler mechanics and a more dated presentation.