In Geometry Dash Online, players control a cube that moves through various terrains while staying in sync with the rhythm of the music. Along the way, you must avoid dangerous traps that will instantly end the game if touched. At first, the gameplay seems simple, but the difficulty quickly increases and challenges even experienced players.

The gameplay becomes more dynamic when the cube passes through space portals. Each portal transforms the cube into a different form, and every form has its own unique controls and mechanics. Players must quickly adapt to these changing play styles, making the game both challenging and distinctive.