Yume Nikki is a surrealistic adventure game created by Japanese developer Kikiyama (ききやま). The game is one of the most well known published RPG Maker games, due to its open-ended exploratory gameplay, imaginative landscapes, surrealistic horror elements and minimalist storytelling.
The original game was released in June 2004 and received updates until 2007. There are two English releases of Yume Nikki: an unofficial English patched version and an official version released by AGM Playism. The Playism version was later released on Steam in January 2018, in preparation for the 3D reboot Yume Nikki: Dream Diary.
The game has a large cult following, which inspired multiple fangames with similar gameplay elements and imagery such as .flow and Yume 2kki.