Immortal. Deity > 50%, > 80% if it's a forum game as they're almost always easier than random rolled Pangeae games. Pangaea deity is really the hardest game i feel, if you don't have room for more than 3 cities which is rather often the case and you don't have fast commerce sources to build up for a quick rush you're just stuck with these 3 cities for a long time. Winning liberalism can still save you but if that doesn't work out too it will often be too hard. On Continents like maps you have more room to expand. You can run into the runaway AI here but it's often possible to deal with that in the modern game.