Uneven Dream

Overview
Outotsu Yume (凹凸夢, Uneven Dream) is a collaborative Yume Nikki Fangame administrated by FD and Nex. The game is similar to Yume 2kki (and, by extension, Yume Nikki: Solitude) by being made primarily of contributions submitted by a multitude of developers. In 2016, Outotsu Yume underwent an extended hiatus until being revived in 2019.

Gameplay
Outotsu Yume stars two protagonists: Kubotsuki and Totsutsuki. The player chooses a protagonist at the start of the game, but is able to switch between the two at will using the computer in each character's room. Both characters' computers allow them to save, change characters, and access a sound test (previously accessed through obtaining effects.) Outside of the collaborative aspect of the game and its multiple characters, Outotsu Yume is relatively traditional, with gameplay revolving around exploration and collecting effects.

Plot
The plot of Outotsu Yume is kept ambiguous (though previous versions were more direct in storyline), but the differences between Kubotsuki and Totutsuki's personalities and environments are emphasized heavily.