Riverhillsoft

Nazo no Mascarade Japan	NEC - PC Engine - TurboGrafx 16	1990
Buster Ball Japan	Sega - Game Gear	1992
Soukoban Japan	Sega - Game Gear	1990
Densetsu no Ogre Battle Gaiden - Zenobia no Ouji Japan	SNK - Neo Geo Pocket Color	2000