With a devoted cult-following, Yume Nikki is a window into a recluse girl’s mind were players are invited to explore her dreams with little objective beyond finding 24 collectable “Effects” items that change the main character, Madotsuki’s appearance and sometimes give her new abilities. Yume Nikki is a 2D, top-down game from 2004 created by a single Japanese developer known as Kikiyama.