Microgaming · Norse mythology · the classic + Thunderstruck II
Thunderstruck is one of the most enduring slot series ever made — Microgaming’s Norse-mythology line built around Thor and Asgard. From the 1998 original to Thunderstruck II and the newer Gold Blitz Extreme, it pairs strong RTP with genuinely good free-spins rounds. It’s a series worth trying free before you play for real.
Thunderstruck (1998) is the classic: 5 reels, 9 paylines, a wild Thor, a ram scatter and a free-spins round of 15 games with a 3x multiplier. Simple, fast and still fun.
Thunderstruck II is the one most players mean today: 243 ways to win and the Great Hall of Spins, a four-level free-spins feature you unlock over time — Valkyrie, Loki, Odin and Thor, each with its own perks such as rolling reels and multipliers.
Thunderstruck Gold Blitz Extreme is the modern take, adding a Gold Blitz jackpot mechanic on top of the familiar theme for players who want more volatility.
The original returns roughly 96.1% and Thunderstruck II about 96.65% — both above many slots. Volatility is medium on the classic and medium-high on II, where the top Great Hall levels are where the real money is.
Thunderstruck earns its long-running popularity: good RTP, a standout free-spins feature in Thunderstruck II, and versions to suit both casual and higher-variance players. Try it free to see which version fits you, then play at a strongly licensed Microgaming casino.
The series leans hard into Norse mythology: Thor is the wild, his hammer and horn sit among the high-value symbols, and a ram acts as the scatter that triggers free spins. Thunderstruck II expands the cast with Valkyrie, Loki, Odin and Thor himself, each tied to a level of the Great Hall of Spins. It’s a theme that has aged far better than most late-90s slots.
On the classic you choose coins per line and coin value across 9 paylines; Thunderstruck II swaps fixed lines for 243 ways to win, so you simply set your total bet. Both scale comfortably from small stakes upward. Whichever version you pick, the free-spins round — not the base game — is where the value sits, so it pays to understand how it triggers before you play for real.
Want more feature-rich video slots? Browse our full slot reviews, including Mystic Dreams (also Microgaming) and the RTG favourite Coyote Cash.
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