Virtual reality technologies dramatically change the game experience when compared to most popular console games. VR systems may provide a higher user involvement due to the possibility of stereo visualization, human-body interaction, large playing space, etc. The role of photorealism in games will then need to be reconsidered as this plays a bigger and different role in system with large and stereo displays. In this paper we analyze the role of photorealism and stereo viewing when using virtual reality technologies for computer games. Results from a series of tests performed on a 6-sided CAVE and large Panorama environments were compared with those of a PC-desktop.