I'm curious how publishing to iOS works, can you specify exactly which devices the game will be compatible with?
For example, my game runs perfectly on ipad4 but far too slow on ipad2, can I only support ipad4+ ?
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It depends a little on how you are publishing, but with XCode you can only specify by the minimum iOS level.
On Xcode you can choose device support between either iPhone or iPad by modifying the info.plist file