I ran some tests using the Buffet 1.2 practice hack to confirm enemy spawns.No matter how you get to Level 9, the blue stairs leading up to the top of the mountain always sets the same spawn value. As long as you don't go to an extra screen after the blue stairs, you will always get the spawns seen in every legit world record speedrun.I did notice that different screens in the overworld appear to set movement patterns. For example, this screen changes the 8F value when reentering it, which appears to have an effect on enemy movements in Level 9.Using Up+A and walking to Level 9 going through the screen pictured above appears to set enemy movements as well.However, I could not reproduce the enemy movements Rodrigo got.Maybe there are other factors that determine movements that I'm missing.