I'm confused... is this supposed to be movies adapted from video games, or movies that have video games central to the storyline?
Regardless... Scott Pilgrim, Tron, and Grandma's Boy have little to do with either.
Have you seen Scott Pilgrim vs. The World? That movie is positively swimming in videogame. And it is gloriouz.
I love that movie, but including it in a list of "video game" movies is like including Inglourious Basterds in a list of "movies about movies".
Not to mention that is was adapted from the comic book series, and the main fighting storyline was inspired more by musicals than video games.
But, whatever, I don't really care that much. Good movies are good movies, no reason to pigeon hole 'em!