Mario & Luigi: Superstar Saga is a role-playing video game developed by AlphaDream and published by Nintendo for the Nintendo Game Boy Advance in 2003. It follows Mario and Luigi as they travel to Beanbean Kingdom in order to restore Princess Peach's voice from the clutches of Cackletta, who plans to use her voice to activate the Beanstar and have her wish to conquer the Mushroom Kingdom granted.
Potato and MUGG in this run beat the game as fast as possible by corrupting the save file so that it tricks the game into thinking most of the story has already been completed, then by zipping and teleporting across the world to the final level where Cackletta is nowhere to be found and the ending cutscenes with Bowser, Peach, and friends can be instantly triggered. For further details, you can read the authors' notes here.