Finnegan's Formula is an engaging video slot game set in a standard 5-reel, 4-row format, with the potential to expand during the free spins bonus round. Initially offering a decent number of ways to win, this count can dramatically increase, providing an interesting gameplay dynamic. You'll start with a betting range that is easy to approach, making it accessible for a variety of players.

In terms of graphics, Finnegan's Formula leverages an Irish theme combined with a distinctive Steampunk twist, setting it apart from other Irish-themed slots. The unique design choices ensure that players are not only drawn in by familiar cultural motifs but also intrigued by the innovative visual elements. This combination enhances the overall gaming experience, making it both charming and fresh.

Regarding its volatility, Finnegan's Formula is on the higher end of the spectrum. This means that wins might not come frequently, but when they do, they can be significant. The RTP is quite favorable, indicating that players have a fair chance over extended play sessions. The game is promising for those willing to take higher risks for potentially generous rewards.

The slot is rich with bonus features, most notably the free spins with expanding reels mechanic. Landing scatter symbols not only awards free spins but also the chance to enlarge the game grid, significantly boosting winning opportunities. There's no limit to the number of additional free spins you can earn, adding another layer of excitement. All these elements together make Finnegan's Formula a thrilling and potentially rewarding slot game.