DeCodeX is a 2.0 Hard Demon created by Rek3dge. As its name suggests, it is a remake of his popular level, DeCode. This level has roughly the same layout as DeCode, but was remade in 2.0. Hence, the overall design has changed a lot, using the new 2.0 textures. Some other changes made including replacing the fast cube with a robot, and a few moving obstacles, most notable during the moving portals with the UFO.
- This level seems to signal Rek3dge's comeback after it was thought he quit Geometry Dash after removing his previous videos.
- DeCodeX was also hacked by Anaban as well as DeCode, but was restored.
- GuitarHeroStyles crashed at 83%(Near the ship and size portal) and 87%.
- SoulsTRK crashed at 80%.
- RealGoldenDash crashed at 96%.