Fortunium is a 2017 Microgaming slot set in a lavish steampunk city, and it has aged better than most contemporaries from that era. It was ahead of the visual curve when it launched — detailed, cinematic, with a sense that real craft went into the world-building — and the both-ways payline system combined with mystery symbols makes the base game more consistently engaging than most five-reel slots of that vintage. For a nine-year-old release, it still feels like it belongs in a current library.

The 5×5 grid runs 3,125 ways to win in both directions — left to right and right to left simultaneously — which effectively doubles the base pay potential compared to a standard left-to-right setup. Bets run from $0.25 to $125. The steampunk fantasy theme is delivered with genuine commitment: cog-driven architecture, Victorian elegance translated into a fictional metropolis, a cast of characters embedded in the world rather than floating in front of it. The aesthetics reward attention.

Mystery symbols are the mechanical engine. They land as blank tokens and transform simultaneously into the same high-value symbol — on a 5×5 grid with both-ways pays, a strong mystery reveal can create significant clusters of matching symbols across multiple directions in a single event. Free Spins amplify this by increasing the guaranteed number of mystery symbols that appear per spin, turning the already-interesting base mechanic into the slot’s most rewarding state. There is no Bonus Buy option, so everything comes through the natural rhythm of play — which suits the slot’s measured, unhurried pacing.

Fortunium runs a 96.47% RTP with medium volatility, a comfortable combination for players who want sustained engagement without punishing variance between feature triggers. The max win reaches 1,200x your stake — modest by current standards, but the both-ways mechanic and mystery symbol frequency keep sessions active rather than passive. The slot was never designed around extreme win chasing; it was designed around consistent, well-crafted play.

Fortunium suits players who appreciate mechanical intelligence and strong art direction over extreme volatility. The mystery symbol reveals on a full 5×5 both-ways grid remain genuinely satisfying, and the slot demonstrates that thoughtful design compounds over time in a way that most trend-chasing releases never manage.