The requirement for the April 2016 24 Hour Contest is "Atlantis":
https://boardgamegeek.com/thread/1552593/24-hour-contest-april-2016
Tips & Resources for Board Game Designers
The requirement for the April 2016 24 Hour Contest is "Atlantis":
https://boardgamegeek.com/thread/1552593/24-hour-contest-april-2016