Most "unblocked cracked" versions are actually fangames like Geometry Dash Meltdown (which is free and legal) or The World's Hardest Game with a geometry skin. You are not playing the real game.
Another official spinoff from RobTop. Three unique levels with new music. Totally legal, totally free.
Most cracked web versions of Geometry Dash are actually the Lite version (free on app stores) embedded in a dodgy HTML5 player. You get only 3-5 levels, no editor, and constant lag. You have been tricked.
Before you click that sketchy link, understand what you are actually downloading. Cracked software rarely comes for free—you pay in other ways.