If you want to add more than 18, then it can't be done without a mod.
If you just want pre-defined civs on your map, then start the map with "custom scenario", choose the civs you want on that map, start the game, open the worldbuilder, replace the units for every civ and save it as worldbuilder file.
And you should not spam multiple threads with the same question .
If you just want pre-defined civs on your map, then start the map with "custom scenario", choose the civs you want on that map, start the game, open the worldbuilder, replace the units for every civ and save it as worldbuilder file.
And you should not spam multiple threads with the same question .