Chrome: The problem with email is that it never lets up -- there's always more on the way, so why not turn the process of answering it and archiving it into a game? The Email Game is a Chrome extension that awards you points for decisive action on filtering and deleting messages and quick replies.
The developer behind The Email Game reminds us of the time when getting email used to be fun, and says it can be again with the help of The Email Game. If you're the type who can't help but earn arbitrary points and badges in online games, The Email Game is perfect for you.
Each message you open or respond to starts a timer, and you'll get points based on how quickly you decide what to do with it or how quickly and concisely you respond to it. Accumulate enough points and you'll level up. In the end, the goal is to get you to play your way to a cleaner inbox and better email management habits. Also yes, the add-on needs access to your mailbox to work, so if that makes you squeamish, this isn't for you. The Email Game works wherever Chrome does, and supports Gmail as well as Google Apps accounts.
The Email Game [Chrome Web Store]