I brought a game for my Iphone a few months back, but I just got my Ipad yesterday. Do I have to buy the HD version of the game again? I know I can play the Iphone version but the res isn't that great.
As long as you have got the latest version of iOS just check the purchase history in the AppStore. It's a button at the bottom. If it's there under iPad apps you can just download it again. If not I'm afraid you will have to buy the correct version.