Area 51 by Concept Gaming uses a 5-5 layout with a 96% RTP and low volatility. The betting range runs from USD 0.5 to USD 5, and the top win is 15x.
Mechanics center on a set of symbols and a feature suite, including Bonus Game, Bonus symbols, Free Spins, Scatter symbols, and Wild. Additionally, Wilds act as substitutes to help form winning lines. In practice, Free Spins add rounds without raising the stake.
In sum, Area 51 presents a low-variance layout with a conventional set of symbol features and a green-alien-fantastic weapons aesthetic.