"Radiation's Halloween Hack" is one of the most famous earthbound ROM hacks of all time. better known as the earthbound halloween hack, it's somewhat infamous "bad fur day edition" was made by the to-be creator of undertale. Toby Fox released the project in 2008 for starmen.net's 'halloween funfest' - and nearly 15 years on, it's creative influence carried over into his later works.