From Wikipedia: Perry Mason: The Case of the Mandarin Murder is an interactive fiction computer game with graphics. The game was published by Telarium (formerly known as Trillium), a subsidiary of Spinnaker Software, in the year 1985. The game is based upon the fictional character Perry Mason. The defense attorney Perry Mason is authored by Erle Stanley Gardner. Source: Wikipedia, "Perry Mason: The Case of the Mandarin Murder," available under the CC-BY-SA License.