If you visit humankind.game and register you can get a special in-game reward for Humankind to be revealed later and a special Games2Gether community badge.
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I've never played one of these style of games before. I guess the closest game I have played to this is SimCity and I enjoyed it back in the day, but haven't played it recently. I'm am up in the air if I would want to take the time to develop my own civilization in a game.