If I have the base game and my friends don't can I play with 3 of them in a custom match? (4 total people)
custom-match add friends
@Selman If you want to play a (4 player) custom match you and your friends have to have access to the expansion you want to play the custom match in. You can either gain access via Catan Gold ( buying it) or unlock it via one scroll (unlock it for 24h) .