| RTP | 96.47% - Compare RTPs |
|---|---|
| Volatility | Medium |
| Reels | 5 |
| Paylines | 40 |
| Bet Range | £0.10 - £125.00 |
| Features | Wilds, Scatters |
Fortunium is a steampunk-themed video slot from Stormcraft Studios, released under the Microgaming label. It takes place in the fictional Victorian city of Fortinium - a gaslit world of airships, clockwork towers and sepia-toned skylines. Behind the visual style sits a genuinely interesting mechanical setup: a 5x5 grid with 40 fixed paylines running horizontally, vertically and diagonally, which gives the game a broader winning structure than a standard 5-reel layout.
Game Details at a Glance
- Developer: Stormcraft Studios (Microgaming)
- Reels / Rows: 5x5
- Paylines: 40 fixed
- RTP: 96.47%
- Volatility: Medium
- Bet Range: £0.10 - £125.00 per spin
- Max Win: 800x stake
Mystery Symbols - The Core Mechanic
Mystery Symbols are what Fortunium is built around. These masked symbols appear throughout the reels during base play and land stacked, covering multiple positions at once. When they settle, they all transform in unison into the same revealed symbol - which can be anything from a wild to a high-value character icon.
The key interaction here is how Mystery Symbols connect to the Win Booster feature. By default, a Mystery Symbol can reveal anything on the paytable. Activate Win Booster, which costs 50% more per spin (raising your maximum bet to £187.50), and the lower-value card symbols are stripped out of the pool. Every mystery reveal then becomes a wild or one of the high-paying character icons, which shifts the distribution noticeably in the base game.
Whether the Win Booster is worth the extra outlay depends on how you want to play. At standard bets you are getting the full spread of outcomes; with it on, you are paying a premium for a leaner, higher-value mystery pool. Over a long session the RTP holds steady either way, but the feel of the game changes.
Free Spins and Mystery Reels
Three or more scatter symbols anywhere on the grid trigger the free spins round. Landing three gives you 10 free spins plus one Mystery Reel; four scatters adds a second Mystery Reel; five scatters awards three Mystery Reels along with the 10 spins. Additional scatters during the round extend the total.
Mystery Reels are the escalation of the base game mechanic into the bonus. During free spins, entire reels are locked as mystery, meaning every symbol on that reel transforms together at the end of each spin. With three Mystery Reels active you can have fifteen simultaneous positions all revealing the same symbol - the kind of alignment that delivers the bigger wins in this game.
The round does not retrigger infinitely, but extra scatters landing mid-bonus add spins to your running total, giving it some longevity without feeling drawn out.
Visuals and Sound
Stormcraft put real craft into Fortunium's presentation. The reels sit inside an elaborate brass and copper frame, and the background cityscape shifts subtly between spins - airships pass, gears turn in the distance. The character symbols (explorer figures in Victorian dress) are illustrated in a detailed art-deco style rather than the flat cartoon approach common in the genre.
The soundtrack is orchestral and restrained - atmospheric rather than intrusive. It ramps appropriately during the bonus without becoming the kind of jingle that grinds on you after thirty minutes of play.
The game was also designed from the start with portrait mode in mind, so it plays neatly on mobile without the cramped scaling you sometimes get when a desktop slot is adapted for smaller screens.
Variance and What to Expect
Medium volatility with a 96.47% RTP puts Fortunium in comfortable territory for most players. The base game produces regular small hits from the mystery reveals; the free spins with Mystery Reels are where the larger wins come from, but they land without the extreme dry spells you get from high-volatility titles.
The maximum win of 800x stake is reasonable for this variance level - not the headline-grabbing multiplier of a high-volatility slot, but achievable within the context of how the game actually plays. At the top bet of £125 that ceiling is £100,000, though realistically most players will be well below that stake.
Verdict
Fortunium earns its reputation as one of the better Microgaming slots from this era. The Mystery Symbol mechanic is more interesting than a straightforward wild or multiplier because its interaction with the Win Booster gives players a genuine choice about how they engage with the base game. The free spins with Mystery Reels scale the mechanic up sensibly rather than just adding multipliers on top of standard play.
If you enjoy steampunk aesthetics and a slot that has some actual mechanical depth to it, Fortunium is worth time. It is not a volatility thrill-ride, but it plays well across a session and the visual quality holds up.
Who makes Fortunium?
Fortunium was developed by Stormcraft Studios, an exclusive content studio working under the Microgaming label. It was one of the first major releases from Stormcraft and helped establish their reputation for polished, theme-driven slots.
What is the RTP of Fortunium?
Fortunium has an RTP of 96.47%, which sits comfortably above the industry average. This figure applies to standard play; the Win Booster feature does not affect the overall RTP.
How does the Win Booster work?
The Win Booster is an optional modifier that costs 50% more per spin. When active, low-value card symbols are removed from the Mystery Symbol reveal pool, so every mystery transformation produces either a wild or a high-paying character symbol. It does not change the RTP but does shift the character of the base game.
How do you trigger free spins in Fortunium?
Landing three or more scatter symbols anywhere on the 5x5 grid triggers the free spins round. Three scatters awards 10 spins plus one Mystery Reel; four scatters gives two Mystery Reels; five scatters gives three Mystery Reels. Additional scatters during the round add extra spins.
What is the maximum win in Fortunium?
The maximum win in Fortunium is 800x your stake. At the top bet of £125 per spin that equates to £100,000, though this is a theoretical ceiling and most wins in the free spins round will be well below it.
Is Fortunium available on mobile?
Yes. Fortunium was designed with portrait mode in mind from the start, so it plays well on smartphones and tablets without the layout issues that can affect slots adapted from desktop-first designs.
Where to Play Fortunium
We're currently updating our casino list for Fortunium. In the meantime, browse our full casino reviews or check out current free spins offers.
Fortunium RTP and Variance
Fortunium has an RTP of 96.47%, which is above average. See our highest RTP slots for the best returning games. Medium volatility offers a balanced mix of win frequency and payout size.
At the minimum bet of £0.10 per spin, a £10 deposit gives you 100 spins with a statistical expected return of £9.65. Read our slot betting strategy guide for tips on managing your bankroll.