Games, style, progressive jackpots and where Microgaming fits best
Top titles: Mega Moolah, Thunderstruck II, Immortal Romance, Book of Oz, Avalon II
Microgaming occupies a unique position in online gambling: it is one of the oldest slot providers still operating, and its claim to historical importance is genuine. Founded in 1994 on the Isle of Man, Microgaming is widely credited with producing the first true online casino software. That history is not just a marketing footnote — it means the company has been iterating on slot design since before most of its current competitors existed.
This Microgaming slots review looks at what the provider actually delivers today, not just what it has historically represented. The catalogue is large, covering hundreds of slot titles alongside table games and other content. But for most players, Microgaming is best understood through a single category: progressive jackpots.
Microgaming is most widely known for Mega Moolah, the progressive jackpot slot that has produced multiple world-record payouts. Mega Moolah is not just Microgaming’s most famous game — it is arguably the most famous progressive jackpot slot in the history of online gambling. The game has paid out jackpots exceeding £13 million and has set Guinness World Records for the largest online jackpot payments.
The Mega Moolah network is not a single slot but a connected system of jackpots that feeds from multiple games simultaneously. Several Microgaming titles, including branded variants, feed into the same progressive pool. That network scale is what allows the jackpots to reach record-breaking sizes.
Beyond Mega Moolah, Microgaming has produced a range of well-regarded slots. Thunderstruck II is a classic high-volatility title with a Norse mythology theme and a tiered free spins system. Immortal Romance combines a gothic vampire narrative with a similarly tiered bonus structure. Both are examples of Microgaming doing something more sophisticated than average in terms of narrative integration and feature design.
Microgaming’s catalogue is large enough that it does not have a single unified style — the range from Mega Moolah’s safari theme to Thunderstruck II’s Norse mythology to Immortal Romance’s gothic romance is broad. What the best Microgaming titles share is mechanical depth: the tiered bonus systems in Thunderstruck II and Immortal Romance, for example, reward sustained play by unlocking progressively better bonus rounds the more often you trigger them.
That approach to layered feature design is not standard in the industry — most providers use a single bonus round structure that does not change over time. Microgaming’s willingness to build multi-stage systems into individual games is a genuine differentiator, even if it is less visible than the Mega Moolah jackpot story.
Microgaming’s portfolio is one of the largest in the industry, with over 500 slots available across its network. The headline titles represent different parts of the portfolio well:
Mega Moolah covers progressive jackpot play — the network mechanic, the record-breaking history, and the wide availability across casino platforms. Thunderstruck II and Immortal Romance cover the narrative-driven slot category, where theme and feature depth matter more than pure volatility. Book of Oz and Avalon II cover the more traditional adventure and Arthurian legend categories respectively.
The depth of the catalogue means Microgaming works as a provider page with real substance — there are enough distinct title categories to write about without relying on a single mechanic or theme.
Microgaming has invested in mobile compatibility across its catalogue, and most major titles run cleanly on mobile browsers. The tiered bonus systems in Thunderstruck II and Immortal Romance can feel more complex on mobile — the bonus selection screens require attention — but the core slot mechanics translate well to touchscreen play.
Mega Moolah in particular is well-optimised for mobile: the jackpot wheel bonus round is large-format and easy to interact with, which matters because jackpot games need to feel accessible to casual players as well as regulars.
Microgaming is widely distributed, particularly in regulated markets. Its presence at a casino is often associated with the availability of the Mega Moolah jackpot network, which can be a significant draw for players specifically looking for large progressive jackpot games.
For US players at offshore casinos, Microgaming availability varies — some offshore operators carry the full library including jackpot games, while others carry only selected titles. The Bovada Casino review and Cafe Casino review are good starting points for understanding which offshore-accessible casinos carry Microgaming content. Canadian players typically find Microgaming well-represented at established operators like those covered in the JackpotCity Casino review, which has a long-standing relationship with the provider.
Microgaming is the clearest choice for players who specifically want progressive jackpot play, particularly the Mega Moolah network. It is also a strong fit for players who appreciate feature depth and narrative design — Thunderstruck II and Immortal Romance both reward sustained engagement in ways that simpler slots do not.
For players who want the most aggressive modern volatility — the kind of multiplier-stacking found in Pragmatic Play titles — Microgaming is less of a priority. The catalogue is built around a different design sensibility, one that values mechanical layering and jackpot scale over raw bonus round variance.
Microgaming is genuinely important in the history of online gambling, and that history is not just trivia. A provider that has been building slots since 1994 has had thirty years to understand what makes games hold up. Mega Moolah is the clearest expression of what that experience produces: a jackpot network so well-designed that it has repeatedly broken world records. The rest of the catalogue — Thunderstruck II, Immortal Romance, Book of Oz — shows that the provider can do more than jackpots when it chooses to invest in feature design. As a provider worth covering on the site, Microgaming has enough depth, history, and headline-game quality to justify a full editorial presence.
