When Peek-A-Boo is discovered, it will attack you, then find another hiding spot. It has 50 health. You know there is a Peek-A-Boo in the room because you hear some music that sounds like a jack in the box. The music gets louder as you get closer to where the Peek-A-Boo is hiding, and the music gets quieter as you move farther away. Watch out, they can startle you when they pop out!

A Peek-A-Boo.