Here's how it works: each day you get an email, and you write one back. Everyone who writes back gets to keep playing, and the game gets more and more interesting as people drop off. We play until there's one person remaining and they're crowned the winner. Now gathering folks for round 3.
A few years ago I did an email game with these rules: everyone gets an email once a day. If you respond to it within 24 hours, you get to play the next day. We keep going until there's just one person remaining. It was a lot of fun. Now I'm kicking it off again and I'm looking for people who want to play. I set up a little google form here for anyone who wants to play.