PK Hack, written in Java is the principal EarthBound hacking utility. It addition to containing modules for editing almost all aspects of the EarthBound ROM, PK Hack comes with its own hex editor and modules for data restoration patch application. Another utility, Map Editor SP, is in progress. Map Editor SP modulizes data in the EarthBound ROM, offering hackers a new level of versatility.
See also: List of EarthBound utilities
Despite the size of the EarthBound hacking community, relatively few complete hacks for the game exist. Hat Quest and Mother 2.5: The Giftman Chronicles are short but complete and impressive. The first completed EarthBound hack, JonBound, also remains popular, though it was created at a time when much of EarthBound's data remained unknown.
See also: List of EarthBound hacks
Two debug menus exist in EarthBound's data. The latter uses a Kirby sprite as its cursor. There are two dummied items, the Video relaxant and the Temporary goods; the former has a description ("What the hey is this?"). A number of unused text blocks and graphics are also present. It is also worth noting that the structure of data in EarthBound's ROM is notoriously scattered and akward to the extent that many of its hackers joke that its programmers were under the influence of hallucinogenic substances.
See also: EarthBound:Fun facts