Press the flag and listen for the audio cues to find the animal. Low pitched = far away and high pitched = really close. If your hear a bunch of sounds at the beginning, that is just so the animal doesn't spawn near you immediately AND so that it isn't on the edge of the walls.
Credit to whoever made https://findtheinvisiblecow.com/. My main inspiration. NOTE: Next update, I will add a menu, a save system (hopefully,) and more animals. This is a game that I am actually passionate about continuing. Btw, the meows are my voice, just twisted in different ways. Yes, all code is mine and so are the animations which I may improve.