These stories feature video games and the people who play, create, or get trapped in them.
These manga are set in or feature video games. The cast may be trapped in a video game or simply playing it for leisure. The majority of the story is set with the cast playing video games and interacting with with the world...
Notice that the manga and light novel in this list aren't sorted by their quality. I was too bone idle and my English is too bad to write any reasons about my choice :)