It is an incredibly difficult thing to sell someone on a game in just one sentence. What are you meant to focus on, genre, specific mechanics, an interesting element of the story? There’s not a right answer! I’m not going to figure out a recipe for success right here and now, but what I can do is at least show you a single sentence that sold me on a game called Burden Street Station quite quickly: “A surreal, narrative adventure game where you shapeshift during conversations to uncover how God went missing.”
