Gray Design Associates released the Hugo's House of Horrors graphical adventure game series, as well as the 3D shooter Nightmare 3D. Later they would go on to develop jigsaw puzzle games, which seems to be the company's focus today.
Games developed and/or published by Gray Design Associates
Nightmare 3D (1995)
Hugo III: Jungle of Doom (1992)
Hugo 2: Whodunit? (1991)
Hugo's House of Horrors (1991)