Yume Nikki (InstanceTopic, 15)

From Compile Worlds

Yume Nikki is a doujin PC game developed by Kikiyama. He thought it would be a good idea to make a screamer video into game form, because it's one of the most creepiest games ever, making Resident Evil look like Mario Party. The game stars mute hikikomori Madotsuki as she explores her dreams. These dreams are some of the most bizarre you will ever come across, and is also home to UBOAAAAA.

The goal is to collect these 24 effects scattered throughout the dreamworld. While some effects are very useful, some are pretty much useless, and used for novelty.

This game also features Monoko, the five-armed girl, and Poniko, who holds a terrible secret...

A fan-made sequel is in the works: Yume 2kki, which features Urotsuki as a main character, while Madotsuki is no where in sight...