3 attributes
This level is hell-themed, was famously top 1, and is named after a place for killing animals.
What is Slaughterhouse?
Focus.
Limbo?
This level uses a popular song, was the first extreme demon, and has its main color in its name.
What is Bloodbath?
Level of the alphabet.
What is B?
This levels name is a question, it is is crazy and it was made before 2.2. [not the sequel]
What is HOW?
Black and lime.
What is Down Bass?
This levels name is a kids game, it has eyes, and the level has an epilepsy warning.
What is iSpyWithMyLittleEye?
Double intensity.
What is Stereo Extremeness? [what is 2 hard is a good answer tho]
This levels name has a number in it, it is made by a well-known creator [collab with Etzer] and its name only has 2 letters/characters.
What is 8o?
Turn around a tree three times three times, what have you just done?
What is 9 Circles?