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Hirokazu Yasuhara - Wikipedia
Hirokazu Yasuhara | Sonic Wiki Zone | Fandom
Game Design Psychology: The Full Hirokazu Yasuhara Interview
The origins of Sonic the Hedgehog - Polygon
Sonic the Hedgehog's origin story, according to the devs who …
The Making of Sonic the Hedgehog and a Chat With World …
SEGA Superstars: Hirokazu Yasuhara | SEGA Nerds
Hirokazu Yasuhara - MobyGames
GDC 2018: Sonic the Hedgehog's Secret Backstory Revealed by SEGA ... - IGN
Sonic's Yasuhara: 'Freedom From Fear' Motivates Game Players