Fortunium is a steampunk-themed slot from Stormcraft Studios, released in 2018 on the Microgaming platform. It uses a 5x5 grid with 40 paylines and centres its story around two Victorian-era inventors, Victoria and Maximilian, who navigate a world of brass machinery, airships and clockwork contraptions. The 96.47% RTP sits above the industry average, and medium volatility keeps the session rhythm balanced between regular small wins and the occasional larger payout.
Quick Facts
Theme and Visual Design
The setting imagines a Victorian city reimagined through steam-powered technology. Copper pipes, cog wheels and glass domes fill the backdrop behind the reels. The two lead characters appear as the highest-paying standard symbols, each stacking to fill entire reels when they land. Below them in the paytable sit a treasure chest, an airship and a brass weapon, while the four card suits serve as the lower-value positions. The soundtrack mixes orchestral strings with mechanical sound effects, reinforcing the industrial aesthetic without becoming repetitive during longer sessions.
Mystery Symbols
The central mechanic in Fortunium revolves around Mystery Symbols. These appear as question-mark icons that can land on any position across the grid. When the reels stop, all Mystery Symbols on screen transform into the same randomly selected symbol. They can reveal any regular symbol except the scatter, which means a full screen of mysteries could theoretically fill every position with the same high-value icon. The 5x5 grid gives these symbols more room to cluster than a standard 5x3 layout, and the transformation happens after each spin settles, giving a brief pause before the result reveals itself.
Win Booster Feature
The Win Booster is an optional side bet that adds 50% to your total stake. Activating it changes what the Mystery Symbols can become. With Win Booster switched on, the low-paying card suit symbols are removed from the pool of possible outcomes. That leaves only premium symbols and wilds as potential transformations. The trade-off is straightforward: you pay more per spin, but every Mystery Symbol result carries higher value. Players who prefer a standard cost structure can leave it off and still access every other feature in the game, making it a genuine choice rather than a requirement.
Free Spins Round
Landing three or more green glass scatter symbols anywhere on the grid triggers 10 free spins. During the bonus round, specific reels are designated as Mystery Reels, meaning they are filled entirely with Mystery Symbols on every spin. The number of Mystery Reels you receive depends on how many scatters triggered the feature: three scatters give one Mystery Reel, four give two, and five give three. Additional scatters during the free spins round award extra spins, extending the bonus. If the Win Booster was active when the feature triggered, the Mystery Reels exclude low-value symbols throughout the entire free spins sequence, which is where the feature's full potential sits.
Paytable and Payouts
The wild symbol is the most valuable individual icon, paying 20x your line bet for five across a payline. Scatters pay independently of paylines, with five scatters awarding 100x your total stake on top of triggering the free spins. Victoria and Maximilian both appear as stacked symbols, covering full reel heights and paying 8x for five of a kind. The treasure chest, airship and weapon fill the mid-range, while the four card suits occupy the bottom tier. With 40 paylines running across the 5x5 grid, winning combinations can form in more directions than the standard 20-line setups found on older Microgaming titles. The maximum win caps at 800x your stake, which reflects the game's medium volatility profile rather than the high-risk, high-ceiling approach of more volatile slots.
How Fortunium Compares
Stormcraft Studios went on to release Fortunium Gold Mega Moolah, which uses the same visual framework but connects to the Mega Moolah progressive jackpot network. The original Fortunium stands on its own as a fixed-payout game where the results depend entirely on the base mechanics and free spins rather than a jackpot trigger. Among steampunk-styled slots more broadly, Fortunium's 5x5 grid and Mystery Symbol system give it a distinctive mechanical identity. The Win Booster adds a layer of player agency that most competitors in the theme category lack, letting you adjust your risk profile within the same game rather than switching to a different title entirely.
Playing Fortunium
Bet sizes run from 0.10 to 125.00 per spin before any Win Booster adjustment. The 40 paylines are fixed, so every spin covers all available lines. Session length on medium volatility tends to run steadily, with the Mystery Symbols providing periodic spikes when several land together. The free spins round is where the larger results concentrate, particularly with the Win Booster active and multiple Mystery Reels in play. The 5x5 grid means there are 25 symbol positions visible at once, giving each spin more visual information to track than a standard three-row game, and the stacked character symbols make full-reel coverage a realistic occurrence rather than a rare event.
Frequently Asked Questions
Fortunium has an RTP of 96.47%, which is above the online slot average. Some casinos may offer a lower RTP configuration, so check the game information screen before playing.
The Win Booster increases your stake by 50% and removes the low-paying card suit symbols from the Mystery Symbol pool. This means Mystery Symbols can only transform into premium symbols or wilds when the feature is active.
Land three or more green glass scatter symbols anywhere on the 5x5 grid to trigger 10 free spins. The number of Mystery Reels you receive depends on how many scatters triggered the round, from one to three reels.
The maximum win in Fortunium is 800x your total stake. This reflects the game's medium volatility profile, delivering moderate payouts more regularly rather than rare high-multiple wins.
Fortunium was developed by Stormcraft Studios and released in 2018 on the Microgaming platform. Stormcraft Studios is an independent studio that creates games exclusively distributed through Microgaming.
Mystery Symbols are question-mark icons that can land on any reel position. When the spin settles, all Mystery Symbols on screen transform into the same randomly chosen symbol, potentially creating large winning combinations across the 5x5 grid.