pick a song, obviously there is no extreme demon without at the speed of light so we are gonna choose that, now make some random obstacles and confusing decoration that makes the level hard, obviously the entire level is onky gonna have 3 colors, red orange and black. make high speed and hard straight flying ships everywhere and make an obstacle that needs memorization, copy and paste everything until the level gets 1 minute then publish it, of course the name gotta have blood or demon and boom! u created an extreme demon.