you need to set it up to a LAN if you are playing offline, providing the game can support it you will need to buy a switch, connect the host to one of the ports and set a custom ip address e.g. 192.168.0.68, once that is done connect the other machines to the switch and change there ip addresses to (make sure each one is different) and click find a server, it should be picked up automatically, if not type in the ip to direct connect