In this AU, Jumbletale, everything has been mixed up. Monsters have attacks belonging to other monsters and the wrong music plays. This battle is genocide, but has the option for you to spare, as Asgore's emotions have been 'jumbled' up. Instructions: Arrow keys to move. Z to select. Avoid white attacks. When an attack is blue, stay still, and when it is orange, move around.
Thanks to Toby Fox for Undertale.