Board Thread:Game Discussion/@comment-27798333-20160608210320/@comment-27945602-20160609104147

On iOS, Achivement is handled based on Game Center account. So for example you can do painting achivement (It needs a lot of gold) and then restore the save to get additional gold via achivement. Since Game Center remembers that you already have reached, It gives you a gold. You can apply this on other person's save data. Real Racing only recognize the Game Center's data, you can earn gold based on your Game Center's data even if you haven't achieved anything on other person's data.