Coffin Dance is a secret floor that portrays the coffin dance meme ([1]). This floor was removed due to the Roblox Audio Privacy Update but was brought back by a replacement song called "Astronomia (Coffin Dance synthwave /retro 80s remix) ([2]).
This floor has a 100 in 20,000 appearance.
Fun fact: This floor has a 1 in 5 chance of being a disco variant.