Hirokazu Yasuhara (安原 広和, Yasuhara Hirokazu, born October 12, 1965) (also credited as Carol Yas) is a Japanese video game designer. He is best known for designing the gameplay and stages of the initial Sonic the Hedgehog video games for Sega Genesis in the 1990s, based on technical demos and engines programmed by Yuji Naka. Yasuhara stayed with...