What is Silent Clubstep?

A 1.8/1.9/2.1 former impossible solo Extreme Demon created, hack-verified, and published by Sailent. It is one of the most famous levels in Geometry Dash history due to the old version of it being previously deemed humanly impossible by many players. Now, 7 years later, it has been nerfed quite a bit and finally verified by Paqoe.