The best way to describe Hide And Seek is by mixing Dead by Daylight in terms of Killer and Survivor structure, Identity V in terms of fun being the focus of our game (even if the balance may be a little flawed), and Dungeons And Dragons in terms of kind of playing with your imagination.
Much like D&D, The Catalyst will be your guide during games. They will be the one who describes your actions after you tell them what your character does, and then they prompt you for your next action. You don't really need to follow those prompts, but you might want to if The Catalyst tells you something like: "Suddenly, you hear a horrifying laugh, echoing from the distance.
Your Fear Meter reaches 45%!"