Yume Nikki (ゆめにっき, Dream Diary) is an adventure/exploration game, created by the Japanese developer Kikiyama. The game follows its main character Madotsuki (most likely a young girl, but there are countless speculations going on) exploring her dreams, and famous for having no plot, dialogs, and even text (apart from the user interface) at all.
This game was the inspiration for .flow.
- Because of its unique nature, it became relatively popular, and fangames started to appear.
- In the earlier fangames, there was a tradition to give the protagonist a name ending with "-tsuki".
- The game's de facto mascot is considered to be 'Uboa', who/what is othervise a secret and very well hidden character.