When I think of video games, the only genre that comes to mind immediately is platforming. To me, platforming is the only genre that is unique to gaming; Other genres are deliverable in other fashions. For example, RPGs you can get from tabletop gaming. Action games you can get from watching a high octane movie or television show. Sports games... well, you can go outside and play actual football. But quality platform action is hard to come by outside of a controller and television screen.
10. Prince of Persia: The Sands of Time
Alright, so "technically" Sands of Time is an action-adventure game. But guess what? I loathe combat in most video games, therefore the best part of this game was the platforming elements. And although the platforming isn't 100% of the game, the controls are so tight and fluid that Sands of Time still leaves on hell of an impression.
