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Information in this article is about real life people, companies and things, and does not relate to the in-universe Sonic series.
Hirozaku Yasuhara (also credited as Carol Yas) (born October 12, 1965)is a former Sega employee. He was the level and game designer of Sonic the Hedgehog (1991), as well as well as the director. He also did works on Sonic 3.