I frequently play Civ 5 multiplayer with my girlfriend, mom, and a friend or two. Unfortunately, all of the computer opponents play at the level of the lowest human player, rendering the games far less challenging. I make sure to put the computer in teams to match the human players, but that takes away almost all of the diplomacy in the game and doesn't increase the difficulty nearly as much as one might think. What can we do to increase the difficulty in a reasonable way? Thanks for your help.