Deadlocked: Medium demon. Deadlocked is the hardest to unlock for a reason: it's tough. Through both a technical stand-point and a memorization stand-point, it is hard in both spectrums.

What is the difficulty of deadlocked?

Deadlocked is the twentieth level of Geometry Dash and the third level with a Demon difficulty.

Is Electrodynamix harder than Clubstep?

Clubstep, ToE2, and Deadlocked (official demon levels) are pretty much way harder than electrodynamix. Sure, you can argue about that, but when the level has many easy parts and also being one of the shortest official levels in the game, it just doesn't deserve demon.