Thunderstruck II Slot Review
We tested Thunderstruck II across multiple sessions and this Thunderstruck II slot review is built on genuine hands-on play. Released by Microgaming in May 2010 and remastered in 2020, this Norse mythology pokie is one of the most played online slots in history and the sibling title to Immortal Romance. Set on a 5×3 grid with 243 ways to win, it features a four-mode Great Hall of Spins that unlocks progressively as the bonus is triggered more times, a Wildstorm feature that can turn entire reels wild in the base game, and a 2x wild multiplier on the logo symbol. With a 96.65% RTP and an 8,000x maximum win, we cover everything below.
| Provider: | Microgaming |
| RTP: | 96.65% |
| Type: | Video Slots |
| Launched: | 2010 |
| Volatility: | Medium |
| Max Win: | 8000x |
| Min/Max Bet: | $0.30/$15.00 |
Thunderstruck II Demo
Where To Play Thunderstruck II
- FastPay100% up to NZ$750 + 100 Free SpinsSecond deposit bonus 75% up to NZ$75
Author: Liam Harrington
Thunderstruck II Slot Game Overview
Thunderstruck II is a 5-reel, 3-row video slot from Microgaming, released in May 2010. It uses a 243 ways-to-win system with wins forming on adjacent reels from left to right regardless of row position. The Thunderstruck II online slot carries a medium-volatility rating with an RTP of 96.65%, above the online slot industry average of 96%. The maximum win is 8,000x your total bet, achievable through the Wildstorm feature or the Loki free spins mode when multiple wild reels align with high-value symbols. The hit frequency of approximately 32.65% means wins land roughly once every three spins.
Our review of Thunderstruck II found a game that earns its legendary status through mechanical design rather than visual flash. The Norse mythology setting with Thor, Odin, Loki, Valkyrie, and the Midgard Serpent feels authentically epic, and the visuals hold up better than many contemporary 2010 releases. The game is best described as medium-to-high volatility in practice: base game wins land often enough to keep sessions comfortable, but meaningful results cluster around the Great Hall of Spins bonus modes. The progressive unlock system creates sustained engagement across multiple sessions in a way that remains uniquely compelling.
Thunderstruck II RTP, Payout, and Volatility
The Thunderstruck II slot review numbers are player-friendly. The RTP of 96.65% sits above the online slot industry average and is one of the higher rates in the Microgaming classic catalogue. No multiple RTP configurations are widely reported for this title, though as always checking the in-game paytable at your casino before playing is sensible. There is no bonus buy feature in Thunderstruck II, so sessions must progress through normal base game play to reach the Great Hall of Spins.
The paytable in the Thunderstruck II online slot features the four Norse god characters as the high-paying symbols, with Thor, Odin, Loki, and the Valkyrie each paying meaningful multiples for five of a kind on a ways-to-win combination. The Thunderstruck II logo acts as the wild and doubles any win it contributes to with its 2x multiplier. Card royal symbols from 9 to Ace fill the lower-paying positions. The 8,000x maximum win requires a full-screen combination of high-value symbols with multiple wild reels active and the 2x multiplier compounding across them. The more common bonus session outcomes are well below this ceiling but still capable of producing satisfying results.
| Slot Name | Thunderstruck II |
|---|---|
| Game Provider | Microgaming |
| RTP | 96.65% |
| Volatility | Medium |
| Paylines | 243 |
| Bonus Buy | No |
| Progressive Jackpot | No |
Volatility in a slot describes the risk and reward pattern. Thunderstruck II is officially classified as medium volatility, which Microgaming defines as a balanced frequency and size relationship. In practice this is accurate: wins land roughly once every three spins in the base game, which is more active than high-volatility titles, and the range of outcomes is meaningfully narrower than something like Dead or Alive 2. Some reviewers classify it as medium-to-high because the Wildstorm feature and the higher Great Hall of Spins modes can produce very large individual outcomes.
The Wildstorm feature can randomly fire in the base game and convert one to five reels to wild. When all five reels turn wild simultaneously the game pays its maximum. Outside of Wildstorm the base game is straightforward 243-ways play where the medium volatility means sessions stay afloat without the long dry spells of high-volatility titles. The Great Hall of Spins introduces more variance as the modes progress: Valkyrie is the most consistent, while Thor’s Rolling Reels mode creates escalating multiplier sequences that can swing wildly between modest and exceptional outcomes.
Thunderstruck II Special Features and Bonus Options
The Thunderstruck II online slot bonuses are built around two core systems: the Wildstorm random base game feature and the Great Hall of Spins four-mode progression. The Thunderstruck II slot game features are structurally similar to Immortal Romance, which shares the same developer and four-mode progressive unlock concept, though the Norse theme and specific mode mechanics differ completely. There is no bonus buy, no Ante Bet, and no accumulated multiplier system. The 2x wild multiplier on the logo runs throughout the base game and all bonus modes. For players who enjoy Thunderstruck II, Immortal Romance from the same studio delivers the same progression concept in a gothic romance setting with a higher 96.86% RTP.
Wildstorm Feature
The Wildstorm feature is the base game equivalent of Immortal Romance’s Wild Desire, and it operates in the same way. It triggers randomly on any base game spin, with Thor’s lightning dramatically striking the reels and converting between one and five reels entirely to wild for that spin. The Thunderstruck II logo wild carries a 2x multiplier, so each wild reel doubles all wins passing through it. Multiple wild reels on the same spin compound their multipliers. When all five reels convert to wild simultaneously, the game pays its maximum base game payout. Wildstorm delivers the most dramatic single-spin moments in the game and is the primary source of large base game wins between Great Hall of Spins triggers.
In testing, Wildstorm fired with reasonable regularity across extended sessions and consistently provided the tension and drama that makes the base game feel alive rather than simply a waiting period for the bonus. The lower end of Wildstorm, where only one reel converts, produces modest results. Three or more wild reels, especially when aligned with the Odin or Thor symbols, can produce payouts that shift a session meaningfully.
Great Hall of Spins: Four God Modes
The Great Hall of Spins is the heart of Thunderstruck II and the feature that has kept players returning across fifteen years. It triggers by landing 3 or more Thor’s Hammer scatter symbols anywhere on the reels. The four modes unlock progressively based on total bonus triggers across any session: Valkyrie’s mode is available from the very first trigger. Loki’s mode unlocks after 5 total triggers. Odin’s mode unlocks after 10 triggers. Thor’s mode, the most powerful, unlocks after 15 total triggers and can then be selected freely.
The features on Thunderstruck II online slot within each god’s mode: Valkyrie awards 10 free spins with a 5x multiplier on all wins. Loki awards 15 free spins with Wild Magic, where extra wild symbols appear randomly during the bonus. Odin awards 20 free spins with Wild Raven, where Odin’s ravens can transform low-paying symbols into high-paying ones on any free spin. Thor awards 25 free spins with Rolling Reels, where consecutive wins within a single free spin chain build a multiplier from 2x up to 5x. Thor’s mode is the most volatile and most powerful of the four.
2x Wild Multiplier
The Thunderstruck II logo wild symbol doubles every win it contributes to through its 2x multiplier, which applies throughout the base game and all four Great Hall of Spins modes. Multiple wilds on the same winning combination compound their multipliers: two wilds produce 4x, three produce 8x, four produce 16x, and five across all reels produce 32x before symbol values are applied. During Wildstorm and during the higher Great Hall of Spins modes, the 2x wild multiplier is the primary driver of the game’s largest single outcomes. In Thor’s Rolling Reels mode, the 2x wild multiplier combines with the escalating Rolling Reels multiplier of up to 5x, creating the potential for the mode’s biggest wins when multiple wilds chain through the rolling sequence.
How To Play Thunderstruck II
Thunderstruck II is accessible to players of all experience levels. The 243-ways system removes the need to track paylines, and the base game mechanics are immediately understandable. The main things to know before playing are how the Great Hall of Spins modes unlock, which mode is currently available to you, and how the Wildstorm feature operates. Here is how to get started.
- 1
Set your bet size
Thunderstruck II accepts bets from $0.30 to $15.00 per spin. The maximum bet is lower than many modern slots. Check the in-game paytable to confirm the RTP version active at your casino. Given the medium volatility the base game is more comfortable than high-volatility titles, but planning a longer session to work toward the higher Great Hall of Spins modes is worthwhile. - 2
Spin and watch the 243 ways-to-win system
Wins form when 3 or more matching symbols land on adjacent reels from left to right regardless of their row. The Thunderstruck II logo wild substitutes for all regular symbols and doubles any win it contributes to. The gods Thor, Odin, Loki, and Valkyrie are the high-paying symbols to watch for. - 3
Watch for the Wildstorm random feature
Wildstorm triggers randomly on any base game spin. When it fires, between 1 and 5 reels convert entirely to wild for that spin. The 2x wild multiplier on each wild reel doubles wins through it. Five wild reels simultaneously produces the game’s maximum payout. Wildstorm is the most exciting moment the base game can deliver. - 4
Trigger the Great Hall of Spins by landing 3 or more Thor’s Hammer scatters
Three Hammer scatters anywhere on the reels opens the Great Hall of Spins. On your first trigger only Valkyrie’s mode is available: 10 free spins with a 5x multiplier. After 5 total triggers Loki’s mode unlocks. After 10, Odin’s mode. After 15, Thor’s mode with Rolling Reels. - 5
Progress toward unlocking Thor’s Rolling Reels mode
Thor’s mode awards 25 free spins where consecutive wins within the same spin chain a multiplier from 2x up to 5x through Rolling Reels. Combined with the 2x wild multiplier this mode delivers the game’s highest win potential. It unlocks permanently after 15 total Great Hall of Spins triggers and can be selected freely from then on.
Thunderstruck II Online Slot: Pros and Cons
Thunderstruck II is a deserved classic that remains genuinely competitive against modern releases. The 96.65% RTP is strong for a 2010 game, the four-mode Great Hall of Spins is one of the most original bonus structures ever designed, and the Wildstorm feature gives the base game real excitement. The Norse mythology theme holds up visually and thematically. The medium volatility makes sessions comfortable for a wide range of players. The downsides are about its age and limitations: no bonus buy, no Ante Bet, a relatively low maximum bet of $15, and the three most powerful modes are locked behind 5, 10, and 15 total bonus triggers which can frustrate newer players who want immediate access to Thor’s mode.
-
RTP of 96.65% is above the industry average and strong for a medium-volatility game from 2010. - Four-mode Great Hall of Spins with progressive unlocking creates sustained engagement uniquely unlike any modern slot.
- Wildstorm random feature converts entire reels to wild and delivers dramatic base game moments between bonus triggers.
- Medium volatility with 32.65% hit frequency gives the base game comfortable activity without the punishing dry spells of high-volatility slots.
- Thor's Rolling Reels mode with escalating multipliers up to 5x is one of the most satisfying free spin experiences in classic slot history.
-
The three most powerful Great Hall of Spins modes are locked behind 5, 10, and 15 total bonus triggers, frustrating new players. - Maximum bet of $15 per spin is significantly lower than most modern high-potential slots.
- No bonus buy, no Ante Bet, and no modern features like accumulating multipliers or tumble mechanics.
Thunderstruck II Final Thoughts
Thunderstruck II is one of the most played slots in online casino history because it earned that position through consistent quality. In testing, the base game delivered steady medium-volatility engagement with Wildstorm providing periodic dramatic moments. The Great Hall of Spins progression system kept sessions purposeful in a way that is still unique in the modern slot library. Thor’s 25 free spins with Rolling Reels escalating multipliers is one of the most satisfying free spin experiences the format has produced, and reaching it after fifteen cumulative triggers feels genuinely rewarding.
We recommend Thunderstruck II to players who value long-term engagement, a strong RTP, and a bonus system with genuine progression. Check the RTP at your casino before playing. Understand that the best mode unlocks only after fifteen total bonus triggers and plan sessions accordingly. Try the demo to experience Wildstorm in action and to understand the base game rhythm. If you want a related experience with a higher RTP, Immortal Romance from the same studio delivers the identical progression structure in a gothic romance setting at 96.86% RTP.
FAQ
What is the RTP of Thunderstruck II?
Thunderstruck II has an RTP of 96.65%, which is above the online slot industry average of 96%. No widely reported lower RTP configuration exists for this title. Check the in-game paytable at your chosen casino to verify. RTP is a long-term theoretical measure and not a prediction of individual session outcomes.
How does the Great Hall of Spins work in Thunderstruck II?
The Great Hall of Spins triggers by landing 3 or more Thor’s Hammer scatter symbols anywhere on the 5×3 grid. Four modes unlock progressively based on total triggers: Valkyrie from the first trigger (10 spins, 5x multiplier), Loki after 5 triggers (15 spins, Wild Magic), Odin after 10 triggers (20 spins, Wild Raven), and Thor after 15 triggers (25 spins, Rolling Reels up to 5x). Once unlocked all modes remain available and can be selected freely.
What is the maximum win in Thunderstruck II?
The maximum win in Thunderstruck II is 8,000x your total bet. At the maximum bet of $15 per spin that equates to $120,000. The 8,000x ceiling is reachable through Wildstorm with five wild reels active or through Thor’s Rolling Reels mode with the multiplier fully escalated on a top-symbol winning combination with multiple wilds involved.
What is the Wildstorm feature in Thunderstruck II?
Wildstorm is a randomly triggered base game feature that fires on any spin. When it activates, between 1 and 5 reels convert entirely to wild for that spin. The Thunderstruck II logo wild carries a 2x multiplier, doubling all wins on each wild reel. When all five reels convert to wild simultaneously the game pays its maximum base game payout. Wildstorm also activates during certain Great Hall of Spins modes.
What is the difference between Thunderstruck II and Immortal Romance?
Both games share the same developer (Microgaming) and the same four-mode progressive unlock structure. Thunderstruck II uses Norse mythology and releases in 2010, has an 8,000x max win, 96.65% RTP, and medium volatility. Immortal Romance uses gothic vampire romance and released in 2011, has a 12,150x max win, 96.86% RTP, and high volatility. Immortal Romance has a higher RTP and higher maximum win. Thunderstruck II has more comfortable medium volatility base game sessions. Both are progressive unlock systems.
Is Thunderstruck II suitable for beginners?
Thunderstruck II is well-suited to beginners, particularly those interested in Norse mythology. The medium volatility and 32.65% hit frequency make sessions active without the punishing dry spells of high-volatility games. The 243-ways system is simple to understand. The main learning curve is understanding that the best bonus modes require patience to unlock over many sessions. The demo version is excellent for getting comfortable with Wildstorm and the base game rhythm before playing for real money.
If you enjoy the Norse mythology theme and Great Hall of Spins of Thunderstruck II, there are several related titles worth exploring. Immortal Romance from Microgaming shares the identical four-mode progressive unlock structure in a gothic vampire romance setting with a higher 96.86% RTP. Hall of Gods from NetEnt delivers a Norse mythology progressive jackpot experience with expanding wilds and a shield-smashing bonus game. Dead or Alive 2 from NetEnt takes the three-mode selection concept to extreme high volatility with a 111,111x maximum win. Here are some other popular titles our readers also enjoy.
