#0 Iggy's Castle is a horror-themed ROM hack of Super Mario World by Wakana Mizuho. What starts out as a ordinary level of Iggy's castle quickly gets strange and spooky as colors become darker, the art style becomes different, and colorful characters such as the Shopkeeper start to pervade Mario's sense of life and death. Can Mario make it out alive? If so, how can he make it out alive?
In this run, thegugafá and ShgofcTAS achieve Ending #4, named by Wakana as "The Speedrunner" and the quickest one to get, in record time.
There is a separate video by the author where he gives commentary over the TAS (Portuguese only).