Detective Conan: I Became Shinichi Kudo

How Do I Change a Novel's Cover and Title? Please Help

Looking for a Book!!!

I'm looking for a book that I think was an infinite-flow story, but I can't remember if it was on Tomato or not. I remember one game had a pearl-diving plot: they had to find the most beautiful pearl or something to clear the game. There was another game later where they had to deliver food to customers or something