Geometry Dash is an online game series in the action genre combined with music. This game was created by Robert Topala (RobTop) - a developer born in 1987 in Sweden. He is also the founder of the company RobTop Games later. This game was first released on August 13, 2013 with the original name: Geometry Dash. It supports two operating systems, Android and iOS, for the time being. Then on December 22, 2014, this game had a version on Steam. 

Website: https://geometrydash-subzero.io