1. To make game rooms like "metaserver list" where everyone can create game and this game can see for everyone and everyone can join in.
2. Host can set maximum number of players, set password and so on.
3. All players play normaly as now and end turn and when 1 player end it's turn - second (2) player got notification to it's phone if he connected to internet that his turn. So when second player ends its turn then - thirth (3) player get notification and so on.
4. Host can also set in game settings max days or hours or minutes for turn - that means if host set 24hours turn time and other didn't end it's turn game automaticly end for it without any moves OR AI player make a move for him.
Here is only primitive ideas how it should look, ofcourse in future can be improved and added more.
A game called "UniWar" ( https://play.google.com/store/apps/deta ... oid.uniwar ) have similar multiplayer mode which is very good