Blood World (血生臭, Chinamagusa, Bloodiness) is a somewhat small area accessible from the Intestines Maze. It can be reached by heading in a general western direction from the Red City's entrance to the maze. A ghost crying blood serves as the portal in the Intestines Maze.
Blood world is a large, black, scrolling area filled with pools of blood, scattered pieces of metal and white crying ghosts.
There is a red and yellow sign/hammer north of the entrance. Interacting with it will teleport you to the Stone Maze.
If you enter the center of the largest pool of blood, you'll be stuck in a looped lake of blood with many crying ghosts, a bloody pedestal surrounded by knives, and a towering white creature rooted into a darker pond of blood. Using the Chainsaw effect on the white creature will prompt it to let out a loud groan. The area darkens, the music changes, and all of the crying ghosts will swarm around you and attempt to inhibit your motion while Scary Faces pursue you. When they catch you, the screen fades to black, and Urotsuki wakes up. (Viewing this minor event will unlock a wallpaper)