Anamorphosis is a traditional Yume Nikki fangame. The goal of the game is to explore Kikei's dream world and find Personalities, the game's version of effects. Every single Personality turns the protagonist into something that bears no resemblance to their original self, an unusual feature for a fangame.

Before version -0.75, the game was made with RPG Maker 2003, until it was remade in RPG Maker VX Ace.