From Sega Retro
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Keiichi Yamamoto is an object and effects programmer best known as the Program Director for Sonic the Hedgehog CD.
- Sonic the Hedgehog CD (1993) — Program Director, Special Stage Programmer, Program (Secret Special Stage Staff)
- Shenmue II (Dreamcast Version) (2001) — Programmer (Special Thanks to)
- Tekken 4 (Arcade version) (2001) — 2D Object & Effects Programmer (Tekken 4 Arcade Project Staff)
- Tekken 4 (PS2 Version) (2002) — 2D Object & Effect Programmer (Tekken 4 Project Staff)
- Urban Reign (2005) — Graphics & Tools Programmer (Programming Unit)
- Sonic CD (XBLA and PSN Versions) (2011) — Program Director (Original Mega CD Staff), Special Stage Programmer (Original Mega CD Staff)