What makes Thunderstruck II different
Thunderstruck II is a 5-reel, 243-ways pokie by Microgaming, released in 2010. It is one of the most feature-rich pokies from the pre-2015 era, with four distinct free spins modes that unlock progressively as you play — a design unique at the time of release.
The game is set in Norse mythology and features Thor, Odin, Loki, and the Valkyries. Its 243-ways structure means any matching symbols in adjacent reels from left to right form a win, without fixed payline patterns.
The Great Hall of Spins
The game’s signature feature is the Great Hall of Spins, accessed via 3+ Hammer scatter symbols. Four free spins modes exist, each featuring a different Norse character:
Valkyrie — unlocked from the first trigger. 10 free spins; landing 3+ scatters during the round adds 5 more spins rather than retriggering the round from scratch.
Loki — unlocked after 5 triggers. 15 free spins; the Wild Magic feature randomly turns additional symbols Wild during the round, expanding winning combinations.
Odin — unlocked after 10 triggers. 20 free spins; Odin’s Ravens Wild transforms symbols at the ends of winning combinations into Wilds after a win, while a 2x or 3x multiplier applies randomly to wins.
Thor — unlocked after 15 triggers. 25 free spins; a Rolling Reels mechanic (winning symbols removed and replaced) activates, with a multiplier trail of 2x→3x→4x→5x on consecutive rolls within the same spin.
The mode unlocks are permanent — once a mode is available, it remains available on all subsequent triggers at that casino account.
Wildstorm feature
During the base game, the Wildstorm feature can trigger randomly before a spin resolves. One to five reels are turned entirely Wild, producing large wins across 243 ways without any scatter trigger required.
RTP and volatility
Microgaming publishes 96.65% RTP. Thunderstruck II is medium-high volatility — the 243-ways structure produces more frequent small wins than high-volatility 10-payline games, but the Thor free spins mode with multipliers generates the game’s largest individual outcomes.
What it costs per hour
At NZ$0.60 per spin and 400 spins per hour: NZ$240 wagered × 3.35% house edge = approximately NZ$8.00 expected loss per hour.
### Q: Do the Great Hall of Spins unlocks carry over between sessions?
A: Yes. Once a free spins mode is unlocked at a specific casino account, it remains unlocked permanently. If you switch to a different casino, the unlock progress starts from zero at that casino. The unlock count is tracked per-account per-casino, not globally.
### Q: Which free spins mode should I aim for?
A: Thor (unlocked after 15 triggers) offers the highest potential through the Rolling Reels multiplier trail reaching 5x, and the most free spins (25). Odin (20 spins with a 2x/3x multiplier) is strong for sustained value. Valkyrie and Loki are intermediate modes — good, but with lower ceilings than the later unlocks.
### Q: Is Thunderstruck II still available at NZ casinos?
A: Yes. Despite its 2010 release, Thunderstruck II remains widely distributed across Microgaming-powered casinos available to NZ players. It is one of Microgaming’s most persistently popular titles in the NZ market.
Playing Thunderstruck II at NZ casinos
Thunderstruck II returns 96.65% over the long run — well above the 78% minimum return required at NZ land-based pokies venues. At the NZ$0.30 minimum bet, the 3.35% house edge produces an expected hourly loss of approximately NZ$4.02 at 400 spins. At the NZ$150 maximum bet that rises to approximately NZ$2,010. The 243-ways structure provides a wide base of winning combinations on every spin, and the Wildstorm feature adds random large wins to the base game that are not available in simpler high-volatility titles.
Medium-high volatility means Thunderstruck II offers more balanced sessions than extreme high-volatility games. The 243-ways format generates wins with reasonable regularity, and the four-mode Great Hall of Spins provides a progression system that makes each session feel connected to longer-term play. Early sessions unlock Valkyrie and Loki modes; reaching Thor’s mode after 15 free spins triggers requires sustained play but provides the highest potential through the 5x Rolling Reels multiplier. The Wildstorm base game feature adds periodic large wins that can rival free spins outcomes. This combination of features makes Thunderstruck II one of the more session-rewarding titles for NZ players who play regularly.
The 2,400x maximum win requires Thor free spins with a Rolling Reels chain reaching 5x simultaneously with the highest-paying combination across 243 ways — a statistical outlier. At NZ$0.30 per spin it represents NZ$720; at NZ$150 it represents NZ$360,000. Expected hourly cost at the NZ$0.30 minimum is approximately NZ$4.02; at NZ$0.60 approximately NZ$8.04.
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Q: What is the RTP of Thunderstruck II?
A: Thunderstruck II has an RTP of 96.65%. This means for every NZ$100 wagered over many sessions, the game returns an average of NZ$96.65 to players and keeps NZ$3.35 as the house edge. At NZ$0.30 per spin and approximately 400 spins per hour, the expected hourly loss is approximately NZ$4.02. Check the in-game information panel at your specific casino to confirm the RTP setting in use — some casinos apply lower settings.
Q: Is Thunderstruck II available at NZ casinos?
A: Yes. Thunderstruck II by Microgaming is available at reviewed NZ casinos on this site. Check individual casino reviews for the current game library — availability can change as operators update their game catalogues.
Q: What is the maximum win on Thunderstruck II?
A: The stated maximum win is 2,400x your stake. At NZ$0.30 per spin this would be NZ$720.00. Maximum win figures represent the theoretical ceiling under optimal conditions — they are statistical outliers that occur rarely across millions of spins, not typical session outcomes.