Instructions
Launch "Civilization III: Complete."
Select "New Game" from the "Civilization III" main menu.
Select your world size. Click the check mark at the bottom right of the screen to move to the next menu.
Select your civilization and your opponents' civilizations.
Click the box next to "Allow Conquest Victory" under the "Game Limits" section at the bottom of the screen. The box turns blue indicating it is now turned on.
Click the check mark at the bottom right corner of the screen to create your map with the "Conquest" option turned on. The game now begins on the map you have created.