My 4 favorite final boss hacks in New Super Mario Bros. U for the Wii U. The hacks in this video were created by WillyMaker and Jannintendo, their channels can be found below.
WillyMaker: https://www.youtube.com/channel/UCBDaY5sapkDhqlBBNJnW-Og
Jannintendo: https://www.youtube.com/channel/UCHIDG7vUdE8SWxvAU7yF7Rw