My favorite game I played is Undertale. It is by far my favorite. It has a unique fighting system, awesome characters with distinct personalities and more. I wold HIGHLY recommend it to someone. It is worth every penny of the $10 it is.
tough question... There are a lot of games out there. I think my favourite game is Modern Warfare 3, which introduced me to the Call of Duty-franchise. I also like story-driven games, like Life is Strange, Uncharted and The Last of Us.