I have 4 kids and they all have games on their iPads that are the same games. How do I get the accounts squared away so they are no playing each others game? For example, everyone has "Clash of the clans" on their iPads and they all play the same game. How can we get it so each person can create their own world in the game and not interfere with each others' game?
As I understand it, iOS games keep their save states associated with a particular Apple ID and its associated Game Center username. You could definitely have different save states on different iPads for different children if they had different Apple IDs - however, be warned that this will mean that you'll have to buy the game independently for each Apple ID if it's not free. Some games, however, will allow you to have multiple save states under the same ID. I'm not sure if this is the case with Clash of the Clans - I'm not familiar with it.
As patrix noted below, it may be possible to download the same game to multiple devices with multiple accounts - I'm still unsure if this will interfere with online behaviour/Game Center interaction, however.