Jack Bros., known as Devil Busters before its release, is an action video game developed and published by Atlus for the Virtual Boy console in 1995. It was the first Megami Tensei game released outside of Japan. The game allows players to play as one of three brothers - Jack Frost, Jack Lantern, or Jack Skelton - as they deal with the predicament of returning to the fairy realm on Halloween in time to not disappear from existence. The game uses an overhead style similar to the Gauntlet series of video games and uses a three-dimensional red-and-black presentation. It received generally positive reception for its gameplay yet received some criticism for its length.

The Jack Bros. consist of three brothers - Jack Frost, Jack Lantern, and Jack Skelton - all of whom players can control in a stage. Frost is a snowman, Lantern is a pumpkin, and the third is a skeleton. The story of the game is that the brothers have taken advantage of Halloween to leave the fairy realm and play with children; they lose track of time however and must get back to the realm before midnight or they will cease to exist. The game is divided into six levels which consist of three or four stages each. Each level has a strict time limit which is reduced every time the player gets hit. In each of these levels players must collect multiple keys per level and has to combat enemies. At the end of the final stage of each level is a guardian that players must overcome to progress.