World Domination is a type of game play where a computer world exists, and players are constantly fighting over countries. A screen then comes up like the Custom Match chat room, and you can play as normal. This mode is just like the Galactic War for Total Annihilation. When playing on a LAN, there is support for up to eight players. LAN games are played just like a Custom game, but no records are kept of wins or losses.
Users select the variables they want, like map size, resources available, tile-set, etc.
If you don't like playing on maps you don't know, there is a good amount of pre-made maps available. The only major problem I have found playing multiplayer is the amount of players who get disconnected. If you don't have anything faster than a 56k modem, I would suggest that you stick to 2 player battles. With 3 or 4 people playing, it can get very laggy on an analog modem. There are several types of gameplay available in multiplayer.