Each of my sons would like to play Subway Surfer. One would like to play on my iPad, the other on my iPhone. Both devices are connected to the same Apple ID (mine). How can I download the game "twice" (once on the iPad and once on the iPhone) so that they can play independently (without affecting the other's "file" or high scores, etc.)?
iPad
If you download the game on one device you should then be able to download it for free on the other via the Purchased tab in the App Store app (or just download it on your computer's iTunes and then sync it to both the iPad and the iPone).
Re-downloading : http://support.apple.com/kb/HT2519
Note that the game (if I'm looking at the correct one) allows in-app purchases, so you might want to turn that 'off' on both the iPad and iPhone via Settings > General > Restrictions
The login you use for GameCenter on each device tracks high scores etc. if you use the same GameCenter login on both devices then the high scores etc. will be overwritten.
In order for them to play independently, once the game is installed on both devices, you need to make sure that you either 1) are not logged into GameCenter on one or both devices, or 2) you are logged into GameCenter with a different Apple ID on each device.
One game, one iPad, one iPhone, two kids.
