I think that the most complicated demon is clubstep Because there are people who take up to 400 attempts to complete it while TOE 2 and deadlocked take them at least 200 attempts, and clubstep was one of the levels that gave them a good Use To the UFO and the ship.
As a moble player thery of everything 2 has got to be the hardest level of them all I beat clubstep and deadlocked but this one is just a different level.