From (Wikipedia)[https://en.wikipedia.org/wiki/Atlantis_PbeM “Atlantis PbeM”]:
Atlantis is a free open-ended multi-player computer moderated fantasy turn-based strategy game for any number of players. It is played via email. The game world is populated by many races and monsters. Players may attempt to carve out huge empires, become master magicians, intrepid explorers, rich traders or any other career that comes to mind and interact with other players in trade, war and alliances. There is no declared winner of the game, players set their own objectives, and one can join at any time.
Russell Wallace developed the initial version and ran the first game, Atlantis 1.0 in 1993.
Started with 18 players in April 2013, Atlas is a reboot of the original 1.0 rules, (with some modifications)[https://github.com/ennorehling/atlantis1/blob/master/rules.md]. This game will not be accepting any more players.
If you are interested in joining a future game, you can (sign up)[http://bit.ly/15Xkjyf] and wait.