Challenge Creator: Bill
Map size: Standard
Other map settings: young wet world with low sea level
Difficulty level: Prince
Link to the game start: Pachacuti_0000 BC-4000.Civ5Save
The Incans have a lot of synergy with a young world given that the terrace farm they have is most effective when there is a lot of hilly terrain around.
Want to see if you can do better than us? Feel free to join in and try the challenge as well. Simply dump the file into your Civ5 save folder (C:\Users\[name]\Documents\My Games\Sid Meier's Civilization 5\Saves\single), and then selected from the Load dialog in the game.
If you email us your results we'll post them here. Contact emails: Andrew, Bill