Premise: OverBlood is a science fiction video game developed by Riverhillsoft and published by Electronic Arts for the PlayStation. It is considered one of the first survival horror games to make use of a fully three-dimensional virtual environment, second only to Riverhillsoft's own "Doctor Hauzer", a fully 3D survival horror game released for the 3DO in 1994.
Hypothesis: OverBlood is the first survival horror game to make use of a fully 3D and virtual environment.