Bioshock

This is one of the few steampunk fantasy games to make it big, and it easily deserves that popularity. Bioshock is set in Rapture, a sprawling underwater city that has lost its status as a utopia. Inhabited by genetically modified creatures, giant mechs, and humans with supernatural powers, its brooding atmosphere makes for a tense and immersive play. Inhabiting the body of Jack, you crash land in this terrifying place, and it's up to you to find out exactly what happened. Most of the time, that will come in the form of gun-toting and magic wielding violence as you fight your way through hordes of enemies and discover audio logs and voice-overs. The satisfying blend never gets boring, the genetic enhancements that ruined the city letting you develop your abilities however you choose. As the story unfolds, 2K Games paints a much deeper picture than its FPS gameplay suggests. It details a world of unchecked capitalism, powerful personalities, and plenty of gray areas. Fantastic level design leads you through environments that are beautiful and thought provoking, to characters that will stay with you long after you're finished.