Final Fantasy X is a fantasy game with amazing world building that anyone can infer its genre from just a quick look at some of its set pieces, character design, and world design.
Above is an image of the stadium the in game citizens inhabiting the world use to play a fantasy game called blitzball. Essentially it’s fictional soccer but underwater. You can see that the stadium is floating above the ocean and the sphere of water is where the sport actually takes place. You can tell the genre of where it’s set quickly from looking at it.
Lastly, here’s a photo of a major city in the game. It has unusual architecture for it to have been designed with the modern world in mind, and looks distinctly new and fantasy. There is a water bridge in the background too which by all means is impossible to occur in real life. All these elements tell you the genre of the setting.