Doctors are required to keep current on best medical practices, but those efforts all too often don't do a thing to improve patient care. But what if the class is a game — one that lets you compete against other doctors and show off your smarts? Plus you get funny emails. Oh, and your patients get better, too. That's the gist of an online game tested at eight Boston-area hospitals to see if it could improve treatment of high blood pressure by getting practitioners to follow recommended treatment guidelines.