One of Geometry Dash’s standout features is its level creation system, allowing players to design and share custom levels online. This feature, combined with the ability to play user-generated levels, gives the game near-infinite replayability. Players can incorporate music from the game’s official soundtracks or custom songs from Newgrounds, fostering creativity and competition. Some player-made "Demon" levels are notoriously difficult, surpassing even the official Demon-rated levels.