As the title says, describe your favorite game in one sentence. What is it that makes the game great? Is it something that was novel? Or did the game's moral resonated with you? Or did you have fond memories of it?
Here is what I'll start:
Persona 4's story is a nice reconstruction of Japanese values in the protagonist's group, where honesty and respect for individuality is given just as much value as to the collective culture of the group.