Batman Returns is a platforming game based on the movie of the same name. Normally, Batman must move through five stages on his way to defeat the Penguin. These include the streets and rooftops of Gotham City, Max Shreck's department store, the sewers, and the Penguin's lair.
Mamuuuut, however, uses a glitch which allows him to skip directly to the final portion of the last stage from the first stage. Therefore, he completes it in less than two minutes. For more details, read the author's comments.