Updating this thread to encompass more games I'm in search of and removing some I've found.
Must be original, no convert or bootleg
-Mr. Heli (Irem M72)
-Undercover Cops Alpha Renewal or Japan (Irem M92)
-Nitro Ball / Gun Ball
-Legend of Valkyrie (Namco)
-Splatterhouse
-Thunder Cross
-Michael...
