I'm talking BIG..."Big" is really just a matter of perspective when it comes to video games. There's big in terms of sales (see: Call of Duty), big in terms of popularity (see: Pokemon), and, of course, big in terms of sheer gameplay size (See: Skyrim).
Then there are games that are big in the conventional sense: massive physical structures. While portable games might be more popular, there's a niche market for folks who like to super-size their games. Here are some of the truly biggest games in the world.