Play and learn
Within the game you inhabit a virtual version of China where you can visit markets, read newspapers, watch television, chat and trade with other players and even get a job, and there are plenty of help with the language the culture. Players start out as tourists and can become residents or even citizens of the virtual China.
This sounds like a good idea that might appeal to quite a lot of people.
Do you know of games that teach other languages? Have you tried any of them?