Ao Oni (青鬼, lit. 'Blue Demon') is a freeware role-playing horror video game. The game features puzzle and RPG elements, and revolves around a boy named Hiroshi, who is trapped with his friends in a haunted mansion, and is stalked by a monster. Source: Wikipedia, "[en.wikipedia.org/wiki/Ao_Oni Ao Oni]", available under the CC-BY-SA License.