Dungeons of Daggorath

Dungeons of Daggorath is one of the most famous games that either Tandy or the Coco ever had. It was one of the very first adventure/arcade games on any platform that combined 3D graphics, large playing fields, real time play, and monsters that both had unique sounds, and got louder as they got closer. It is popular enough even to this day that it has a dedicated webpage to it, and if one does a search on the web, one will notice that even modern PC game programmers will sometimes list it as either a big influence from their past, or as one of their favorite games from years gone by.