We are creatures of habit. I remember one morning about three months ago I realized that I had a really good day, full of energy, after eating cottage cheese, nuts, and a Cliff Bar for breakfast. Every morning since then I've eaten cottage cheese, nuts, and a Cliff Bar. When we find something we like, we tend to resist change, even if it's for the better. Publishers know this very well, and when a game sells millions, you better believe bigger publishers are going to try to duplicate that success by churning out identical games with negligible "upgrades." These are seven successful game series that, while not bad at all, are long overdue for some true change and innovation.