Information in the game database is updated periodically. Below, you'll find that information compiled as pertains to Riverhill Soft. The company may be involved as a publisher, developer or both.
Densetsu no Ogre Battle Gaiden: Zenobia no Ouji [June 22, 2000]
Overblood [August 2, 1996]
Nazo no Masquerade [March 2, 1990]
Burai: Hachigyoku no Yuushi Densetsu [August 6, 1991]
Burai II: Yami Koutei no Gyakushuu [December 18, 1992]
Digital Comic: Patlabor - Chapter of Griffon [September 30, 1993]
Faceball [November 26, 1993]
Prince of Persia 
Princess Minerva [March 25, 1994]
Sotsugyou II: Neo Generation [December 23, 1994]
Top o Nerae! Gun Buster Vol. 1 [June 25, 1992]
Top o Nerae! Gun Buster Vol. 2 [March 26, 1993]
There are numerous companies in the industry, and their names change like the weather. The information above is not particular about the finer details. Acquisitions are common, so companies with no recent listings may still be developing games under a new name. For example, DMA Design currently has a Rockstar name. Do you know of a title that is not listed above but should be? Be sure and let a staff member know. You can contact staff if you click here.