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The Map Description in-game explains the rules which must be set to make this map play out the way it was intended:
Balanced map for 3 Players, and 3 City States ONLY. Barbarians can be On or Off. No Ruins.
(You can however play the map in your own way.)



HOW TO PLAY IN MULTIPLAYER:
The MOD will download in this directory:
\Documents\My Games\Sid Meier's Civilization 5\MODS

All players need to move the map to this directory:
\Documents\My Games\Sid Meier's Civilization 5\Maps

Then you can play the map in multiplayer.