Tartarus, which was released a year ago, is currently the most difficult level. Only 8 people have completed the level so far. These are the top Geometry Dash players. Deadlocked is the most difficult primary level in Geometry Dash. When compared to Tartarus, Deadlocked is like beating a level with no spikes, and that's an understatement. Players that have defeated Tartarus have had a difficult time doing it, indicating that Geometry Dash is a difficult game for everyone.