Mother 3 is the final game in the Mother/EarthBound trilogy, and still hasn't been slated for a western release like Mother and Mother 2. This is despite Mother 3 being released on the Japanese Nintendo eShop as a Virtual Console title.
Nintendo's reluctance to release the game internationally is likely because of the game's unusually dark tone for a Nintendo title. Despite this, the game has a cult following in the west through an unofficial fanmade translation of the original game and main character Lucas being a rostered fighter in Super Smash Bros. since 2008.
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