Overview
Originally released by Microgaming in May 2010 and given a full visual remaster in December 2020 (now under the Games Global umbrella), Thunderstruck II is one of the most enduringly popular slots in the industry - a Norse mythology sequel to the original 2004 Thunderstruck.
A Norse mythology theme built around Thor, Odin, Loki, and the Valkyries, framed by thunderclouds, Thor's hammer, and a moody Asgard backdrop.
Bonus Features Breakdown
Wild Logo Symbol
The Thunderstruck II game logo acts as the wild, substituting for all symbols except the scatter and doubling any win it completes.
Thor's Hammer Scatter & The Great Hall of Spins
Landing three or more Thor's Hammer scatter symbols triggers the Great Hall of Spins, a choice of four Norse-god-themed free spins modes.
Four Unlockable Free Spins Modes
Valkyrie (10 spins with a 5x multiplier throughout) is available from your first trigger. Loki (15 spins with random wild magic) unlocks after 5 total triggers, Odin (20 spins with a raven multiplier climbing up to 6x) after 10, and Thor (25 spins with rolling reels and an escalating multiplier) after 15 - so returning players gradually unlock the whole roster rather than choosing freely from the start.
Betting Range & Jackpot
Total bets run from $0.30 up to $15 per spin. Thunderstruck II doesn't carry a progressive jackpot - its biggest built-in win comes from the Great Hall of Spins bonus, capped at 8,000x your total stake.
RTP & Volatility
RTP: 96.65%. Volatility: High.
Our Take
Thunderstruck II earns its reputation the same way Immortal Romance does - already reviewed on this site from the same provider - by giving its free spins bonus genuine structural variety instead of a single repeated format. Four distinct modes, each built around a different Norse god's own mechanic, means the bonus round plays differently depending on which one you've unlocked, not just which symbols happen to land.
The progressive unlock structure - Valkyrie from the first trigger, Loki at five, Odin at ten, Thor at fifteen - is a deliberate long-session hook: casual players get a solid, straightforward 5x-multiplier mode every time, while players who keep triggering the feature gradually earn access to the more elaborate Thor mode, with its rolling reels and escalating multiplier. It rewards playing the same game repeatedly rather than one-off spins.
The wild logo symbol doing double duty - both substituting for other symbols and doubling any win it's part of - is a simple mechanic, but it's a meaningful one on a 243-ways structure, since a single wild landing can double multiple simultaneous winning combinations at once rather than just one payline.
At 8,000x max win and a confirmed, independently published 96.65% RTP, Thunderstruck II sits in similar territory to Immortal Romance - both are older Microgaming titles (2010 and 2011 respectively) that have stayed in regular rotation for over a decade specifically because of how much bonus-round variety they pack in, rather than chasing the highest possible multiplier ceiling.
Pros & Cons
What We Liked
- Four genuinely distinct free spins modes rather than a single repeated bonus format
- Progressive unlock structure rewards extended play with access to bigger, more elaborate bonus modes
- Wild logo doubles wins and substitutes for other symbols on a 243-ways structure, compounding its value
- Confirmed, independently published 96.65% RTP - a rare, verifiable figure compared to most proprietary-software titles
Where It Falls Short
- High volatility means longer dry spells between meaningful wins
- Only confirmed at Grand Mondial and Yukon Gold Casino so far, both of which carry disclosed player complaint histories worth reading before you chase this title specifically for its RTP
- No progressive jackpot - the 8,000x ceiling is fixed rather than growing
- The best bonus modes (Odin, Thor) require repeated triggers to unlock, so casual or low-session players may never see them
Where to Play Thunderstruck II
Frequently Asked Questions
What is the RTP of Thunderstruck II?
Thunderstruck II has a confirmed RTP of 96.65%, consistently confirmed across AskGamblers, PokerNews, and SlotCatalog.
How do the four free spins modes in Thunderstruck II work?
Valkyrie (10 spins, 5x multiplier) is available from your very first trigger. Loki (15 spins, random wild magic) unlocks after 5 total triggers, Odin (20 spins, raven multiplier up to 6x) after 10, and Thor (25 spins, rolling reels with an escalating multiplier) after 15 - so you gradually unlock the full roster the more you play.
What is the maximum win on Thunderstruck II?
The maximum win is 8,000x your total stake, achievable through the Great Hall of Spins bonus, most notably the Thor free spins mode's rolling reels and escalating multiplier.
Is Thunderstruck II the same as the original Thunderstruck?
No - Thunderstruck II is a separate sequel released in 2010 (and remastered in 2020), building on the original 2004 Thunderstruck with a much larger bonus structure. We haven't reviewed the original Thunderstruck.
Where can I play Thunderstruck II?
Thunderstruck II is available at Yukon Gold Casino and Grand Mondial Casino from our ranked casinos, both of which carry Games Global's (Microgaming's) game library.
For similar games, check out our Norse Mythology Slots page.