Jack Bros. is a twin stick shooter game developed and published by Atlus for the Virtual Boy in 1995. A spin-off of the Megami Tensei series, it follows the story of Jack Frost, Jack Lantern and Jack Skelton, who need to rush back to the World of Fairies to avoid banishment on the night of Halloween, across 6 areas and 60 floors. It is also notable for being the first game of the series to have an official English release, despite being a spin-off title.
Darkman425 manages to get back to the World of Fairies using Jack Skelton on a harder difficulty setting accessible after inputting an in-game code.