Setup:
Map :Huge
Map type: Any that focuses on flat ground, eg. great plains
Difficulty: diety
No city States
Only 1 opponent (hopefully far away)
Raging barbarians
Game play:
Focus on a few scouts to search out the barbarian camps. Once one is found focus on settlers. Send the settler as close to a camp as possible without being captured. Found the city and just build buidlings, dont do tile improvements so the barbarians have to attack your city. Dont fire on them either. Just end turn.