From Sega Retro
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- Super Hang-On (Mega Drive Version) (1989)
- Presumed to have been the developer; text stored in the Notes section of the ROM header of the original revision reads "programmed by waka,hama thanks OHE R/D#1"
- Sonic Adventure (1998) — Lead field programmer
- Sonic Adventure DX: Director's Cut (2003) — Lead Field Programmer (Sonic Adventure Original Staff)