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Shinobi (忍?) is a series of video games published by Sega and originally by Sega's Team Shinobi. Team Shinobi changed its name to Overworks in 1999 to coincide with Sega reaching the end of its capability as a hardware manufacturer. When a survey revealed that Americans struggle to pronounce words like Musashi, the game was renamed to Shinobi as the one suggestion that the people of the survey could cope with. Shinobi is used as a nickname for Joe throughout the series. It has been adopted by various characters, most prominently Joe Musashi, the protagonist of the original series of games (Shinobi to Shinobi III). The Ninja Master was revealed to be the father of Alex Kidd.