Anunciado em 2020, Mother 4 é um jogo de fãs destinado a ser uma sequência não oficial de Mother 3, da série EarthBound (Mother, no Japão). No jogo, o jogador controla um adolescente americano chamado Aaron e seus amigos em uma turnê nos Estados Unidos para desvendar os mistérios das Conchas da Fenda, artefatos que concedem um grande poder PSI e lutam para encontrar um inimigo obscuro puxando as cordas em um plano com propósitos desconhecidos. Mother 4 is the second widely known fan project to be released as a sequel for Mother 3, after the former project, which was also announced as Mother 4, was rebranded and became the indie game Oddity.

Three young men discover an unwelcome guest deep in the woods, and America is turned on its head! It's up to a small town teenager named Aaron to tour the United States in order to deal with the aftermath of that fateful meeting and uncover the story behind the "Rift Shells" - ancient artifacts of awesome PSI power and dubious origin. On his journey across podunk suburbia and impossible dungeons, he'll meet the overconfident mechanic Maggie, the reserved yet proficient Troy, the dense but kind hearted magician Trisme, along with many other loyal allies and oddball foes. They'll lift the veil of the untouchable entity pulling the earth's strings, capable of bending the rules and stacking the odds against our heroes, just to harness the power of the Rift Shells for an absolute yet unknown purpose... But there's nothing to worry about with your friends behind your back, right?