This is the last level in the three-part series called Item Abuse 3 and took the level designer PangaeaPanga 3 years to create. What you are looking at is a Tool Assisted Speedrun (TAS) on a custom designed level. This is not a level on a normal Super Mario World ROM, nor is it within the realm of possibility for a human being to be able to do without help from TAS.
“Anyone who can complete this is pretty much mentally insane,” PangaeaPanga said. There has only been one other person crazy enough to complete the level. Give Item Abuse 3 a try if you think you’re crazy enough.