The 2.1 editor removed many previous object limits, allowing creators to build incredibly detailed "art levels" that pushed the game's engine. The "Impossible" Level Trend:
The release of Geometry Dash Update 2.1 January 16, 2017 , marked the beginning of a legendary seven-year era in the game's history. This "2.1 era" became famous for pushing the boundaries of what was humanly possible, defined by grueling level verifications that often took years of dedicated effort. The Dawn of the 2.1 Era geometry dash v21 verified
The official level Fingerdash (Level 21) was verified and released with this update. geometry dash v21 verified