Clubstep is a bonus demon level unlocked by collecting 20 secret coins.
Level
Introduced in update 1.60 along with Electroman Adventures, and giving 14 stars upon completion, Clubstep is commonly regarded as one of the hardest levels in campaign mode. It is currently the only demon level in the Geometry Dash campaign mode.
Unlockables
The secondary color black is unlocked upon completing Clubstep on normal mode.
A new UFO is unlocked upon competing Clubstep on practice mode.
Trivia
Level name has a play on words for the word Dubstep.