(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 Sega until the late 1990s. He then joined Naughty Dog, working on the Jak and Daxter series and Uncharted: Drake's Fortune, collaborating again with former Sega employee Mark Cerny. He was the senior design director at Namco Bandai Games America. In April 2012, Yasuhara joined Nintendo where he accepted a position at the Nintendo Software Technology division. He has since worked for Unity Technologies. Production history Altered Beast (1988) – Game planner Fatal Labyrinth (1990) – Game planner Pyramid Magic (1991) – Special thanks Pyramid Magic Special (1991) – Special thanks Sonic the Hedgehog (1991) – Lead game designer, Game planner Sonic the Hedgehog 2 (1992) – Lead game designer, Game planner Sonic Spinball (1993) – Special thanks Sonic the Hedgehog 3 (1994) – Director, lead game designer Sonic & Knuckles (1994) – Director, lead game designer Sonic 3 & Knuckles (1994) – Director, lead game designer Sonic 3D Blast (1996) – Playfield design, Special thanks Sonic R (1997) – Map design director Sega Smash Pack 2 (2000) – Special thanks Floigan Bros. (2001) – Game designer Jak II (2003) – Game designer Jak 3 (2004) – Game designer Jak X: Combat Racing (2005) – Game designer Uncharted: Drake's Fortune (2007) – Game designer Afro Samurai (2009) – Special thanks Mario and Donkey Kong: Minis on the Move (2013) – Game designer Super Smash Bros. for Nintendo 3DS and Wii U (2014) – Special thanks Mario vs. Donkey Kong: Tipping Stars (2015) – Special thanks Mini Mario & Friends: Amiibo Challenge (2016) – Special thanks Sonic Mania (2017) – Special thanks Sonic Forces (2017) – Special thanks Team Sonic Racing (2019) – Special thanks Sonic Frontiers (2022) – Special thanks References Living people Japanese video game designers 1965 births Nintendo people Sega people Naughty Dog people