well i cheated in a way. once i got all of the multipliers i deleted the game and then downloaded it again. when you download it again it will keep all of your multipliers because of gamecenter and then i just bought the magnet upgrades and the coin upgrades, which will help you get a lot more points. that and i used a resurrection hah
As the one poster said once I was done I had deleted it then reinstalled and did nothing but coins and magnets and ended up with over 20 mil. I just had screen cap of my legit one it took me about an hour to complete it.