A game whose vertical Field of Vision changes with aspect ratio (rather than being fixed), however it does not provide a detrimental experience to widescreen gamers. The difference between Vert+ and Vert-, is that a Vert+ game was designed for 16:9 or 16:10. A Vert+ game will give you more "floor and sky" in 4:3, but you're not missing anything in 16:9. A Vert- game has it's proper aspect at 4:3, and you got off the intended viewport at widescreen resolutions. This is a modern phenomenon that is coming into play for games made at the end of the Xbox360/PS3 console file. Some modern games, such as those based on the UE3 engine, may still be Vert-.