Use space/up arrow/click to move up and release to go down. Don't forget rule one, though: DON'T DIE. Blue is easy. Green is medium. Red is hard. Try and beat the highscores!
Special Thanks to -Yodasaurus- for Wave 2.0 and RobTop Games for the concept and the death sound. Wave 2.1 is out, when is Geometry Dash 2.1 out?