Thunderstruck II: the short verdict
Thunderstruck II, from 2010, is built around two ideas: Wildstorm, which can turn up to five reels wild, and a set of free spins modes you unlock rather than get all at once. The catch is information. The studio does not publish its RTP, layout, bet range or max win in public, so you have to read the game's own help screen before you can judge it. Worth a look for fans of classic reel slots; verify first, then play.
19+ (18+ in AB, MB and QC). T&Cs apply. Not available to Ontario residents. Play responsibly.
Thunderstruck II is the 2010 sequel in the Thunderstruck series, a reel slot now listed in the Games Global portfolio and presented on the series page of its Stormcraft Studios label. It is remembered for two features. Wildstorm can turn up to five reels wild at once, and the free spins come as several modes that you unlock instead of a single fixed round.
This page works differently from most of our reviews. The studio does not publish this game's RTP, volatility, reel layout, bet range or maximum win anywhere public, and we only print numbers we can trace to the provider. So we set out what is confirmed, show you where to find the rest in the game itself, and compare it with the Games Global slots in our list.
What is confirmed about Thunderstruck II
Here is everything the provider side states publicly about the game, with the gaps marked rather than filled in:
| Detail | Status |
|---|---|
| Studio | Games Global, Stormcraft Studios series |
| Released | 2010 |
| Signature feature | Wildstorm: up to 5 reels can turn wild |
| Free spins | Several free spins modes to unlock |
| RTP | Not published publicly; check the game's help screen |
| Volatility | Not published |
| Reels, rows and ways | Not published publicly |
| Bet range | Set by each casino; not published by the studio |
| Max win | Not published publicly |
You will find specific numbers for all of these on other review sites. Some may well be right, but none of them come from a public provider source we could check, so we leave them out. The good news is that the game itself answers most of these questions: the help screen at a licensed casino should list the return, the paytable and the rules of each feature for the exact version you are about to play. That is more reliable than any review, including this one.
Wildstorm: when the reels turn wild
The studio describes Wildstorm in one line: up to five reels can turn wild. That is the game's signature feature, and it is worth understanding what a wild reel does in a reel slot like this.
- A wild symbol stands in for regular symbols to complete wins.
- When a whole reel turns wild, every position on that reel acts as a wild at the same time, so any winning combination that passes through that reel can use it.
- The more reels turn wild together, the more combinations on the screen can connect, which is why a multi-reel Wildstorm matters so much.
What the public description does not say is how Wildstorm starts, how often it appears or how many reels it usually affects. Those details sit in the in-game rules, and we would rather send you there than guess. If you try the demo, open the rules first and read the Wildstorm section before you spin; then you will recognise the feature when it arrives and know what it is worth at your stake.
Free spins modes you unlock
Most modern slots give you one free spins round, sometimes with a choice of versions at the start. Thunderstruck II takes a different approach: the studio describes several free spins modes to unlock. In practice, that means the bonus you get is not always the same, and not every mode is open to you from the first spin.
The help screen should list each mode, what it does and what it takes to open it. Read it before you start, because it changes how you should think about a session.
The trap in unlockable features
Progress-based bonuses can make it tempting to keep playing just to reach the next mode. That is exactly the moment to check your budget. Unlocking a mode does not make the game pay more on average; it only changes what the next bonus looks like. A few practical rules:
- Decide your budget and time limit before the session, not after a bonus.
- Don't raise your stake or extend a session to chase the next unlock.
- If a session ends before a new mode opens, that is fine: the game is entertainment, not a project to finish.
How to check the Thunderstruck II RTP yourself
RTP, or return to player, tells you what percentage of everything wagered a slot hands back across millions of spins. It is the single most useful number for comparing games, and for Thunderstruck II you have to find it inside the game. Here is how:
- Open the game at a licensed casino, or in the demo where it loads.
- Tap the information, help or "i" button, usually near the spin controls or in the menu.
- Scroll through the rules to the section on theoretical return or payout percentage, normally near the end.
- Note the figure, and check whether the help screen also mentions the maximum win and the bet range.
The figure you find applies to that casino's version. Providers often supply more than one RTP build of a game, and different casinos can install different ones, so it is worth checking again if you switch sites. Our RTP and volatility guide explains why two casinos can run the same slot at different returns.
Reading the number
To see what the figure means in money, take a game that does publish one. Gold Blitz lists 96.00%, so across an enormous number of spins every C$1,000 bet would come back as roughly C$960, with about C$40 kept by the house. Over a single evening, results swing far above and below that line. Whatever figure Thunderstruck II shows at your casino works the same way.
19+ (18+ in AB, MB and QC). T&Cs apply. Not available to Ontario residents. Play responsibly.
Thunderstruck II demo and free play
The Thunderstruck II demo on this page is the Games Global build, played with play money and no account. It is the best way to read the rules and see Wildstorm and the free spins modes before you put any money in. The play-money maths matches the real game.
The Games Global demo does not load everywhere, and the provider can return an error instead of the game; that is on the provider's side, not a fault on your device. When it does load, use it to:
- Read the full help screen, including the RTP line, which answers the questions this page can't.
- Watch how the base game behaves between features at the stake you plan to use.
- See how the free spins modes are presented and what unlocking the next one involves.
Treat demo results as a preview of the game, not of your luck. A good run in play money says nothing about the next real session.
Where Thunderstruck II slots fit in the series
Thunderstruck II sits early in a long run of games. The studio's series lists the original Thunderstruck and several later titles: Thunderstruck Wild Lightning, Thunderstruck Stormchaser, Thunderstruck FlyX, Thunderstruck Gold Blitz Extreme and Thunderstruck Wild Lightning Mega Moolah. None of those are in our 50-game list, so we don't review them here, but their names show how the brand has been crossed with other Games Global lines.
Two of those crossovers connect to games we do cover. Gold Blitz is the cash-collect slot whose name appears in Thunderstruck Gold Blitz Extreme, and Mega Moolah is the progressive jackpot game whose name appears in Thunderstruck Wild Lightning Mega Moolah. If you like the Thunderstruck name but want a game with published numbers, Gold Blitz is the better documented of the two: it lists its RTP and a high volatility rating.
Thunderstruck II is one of the oldest games in our slot games catalog, and its two headline features are easier to follow than the tumbling grids and multi-mode bet menus of many newer titles.
Playing Thunderstruck II in Canada
You will need a casino with the Games Global catalogue, and which casinos you may use is a provincial matter:
- Ontario players should use casinos on iGaming Ontario's list of regulated sites.
- Alberta players should use operators registered with AGLC, required since the market opened on 13 July 2026.
- Players in the other provinces have their province's own online casino; internationally licensed casinos also accept players, but no province licenses them, so confirm who regulates a site before depositing.
- Age limits: 19 and over, except in Alberta, Manitoba and Quebec, where the limit is 18.
As a Thunderstruck II online slot, it runs in the browser on phones, tablets and computers without a download. Rules for each province are in our guide to playing in Canada.
Budgeting when volatility is unknown
Without a published volatility rating, assume results can swing hard. C$50 lasts 250 spins at C$0.20 or 50 spins at C$1, so choose the stake by how long you want to play, and decide in advance where you will stop. Slots are paid entertainment with a house edge, and no feature or unlock changes that.
Thunderstruck II vs other Games Global slots in our list
Our catalog includes several Games Global titles from different studios. Here is how their published facts compare; a dash means the figure is not published publicly.
| Game | Studio | RTP listed | Volatility | Max win |
|---|---|---|---|---|
| Thunderstruck II | Stormcraft Studios series | - | - | - |
| Immortal Romance | Stormcraft Studios series | - | - | - |
| Mega Moolah | Games Global | - | - | Progressive jackpot |
| 9 Masks of Fire | Gameburger Studios | 96.24% | Medium | - |
| 12 Masks of Fire Drum Frenzy | Gameburger Studios | 96.05% | Medium-High | 5,000x |
| Gold Blitz | Fortune Factory Studios | 96.00% | High | - |
The pattern is clear: the Stormcraft series titles and Mega Moolah publish the least, while the other studios list their return and volatility. If knowing the numbers before you play matters to you, the Masks of Fire games and Gold Blitz are easier to judge. If you specifically want an older reel slot with a famous feature, Thunderstruck II and Book of Dead are the classics in our list, and Book of Dead's paytable and RTP are published in full.
Thunderstruck II specification
Source: stormcraftstudios.com and the game's in-game rules, checked 22 October 2026. A dash means the provider does not publish the figure.
What works and what does not
Pros
- Wildstorm can turn up to five reels wild at once
- Several free spins modes to unlock give more variety than a single fixed bonus
- A 2010 title in a series that has continued with several follow-ups
- Two headline features that are easy to recognise once you have read the rules
- A free demo lets you read the full rules with play money, where it loads
Cons
- RTP, volatility and max win are not published publicly; you must check the help screen
- Reel layout and bet range aren't published by the studio either
- The Games Global demo does not load in every region
- Unlockable modes can tempt longer sessions than you planned
How the feature works
The studio describes two features for Thunderstruck II. Wildstorm can turn up to five reels wild, so every position on an affected reel acts as a wild and helps complete wins. The free spins come as several modes that you unlock, rather than one fixed bonus round. The public description does not state the trigger rules, the number of spins or any multipliers, so read the in-game help screen at your casino for the exact conditions before you play.
Thunderstruck II compared
Thunderstruck II with a real balance
Up to CA$1,500 welcome offer + 100 free spins. Same game, same maths as the demo - set a budget before you start.
Start With Up to CA$1,50019+ (18+ in AB, MB and QC). T&Cs apply. Not available to Ontario residents. Play responsibly.
Written by Owen Brassard, Slot analyst
Fact-checked by Nadia Roy, Fact-checker - every figure on this game page is compared with the provider's own published material.
Updated · Our review process
