The Broken Faces Area is an area easiest accessible from Smokin' HAL in Geometry World.
Features
This area is filled with blood splatters and distorted facial imagery.
By going through the mouth of the white face with bleeding eyes and white hands beside it, you'll enter the Danger Panic Zone, where a variation of Monochrome Feudal Japan's background music will play and eyeball monsters (resembling fetuses) will move around the screen frantically.
Surimuki and Marginal Vivid Worker (two characters that are shown in some books at the Library) appear in this area. Interacting with Marginal Vivid Worker gives you the Marginal effect. By using the Glasses effect near them, it will cause the Twintails Monster to appear.
There is a hexagonal doorway that leads to the UFO which appears periodically and can take you to two different areas. There is also a large black pole with a red eye on it that transports you to the Floating Red Tiles World.
The walking green man (that used to be in Theatre World) can be seen here, and can transport you to the Baddies Bar when you interact with him.