When a game is listed in both HD and nonHD versions, but the HD version is for both Iphone/Ipod Touch and Ipad, does that mean that those who have Retina display should spring for the HD version to take advantage of just that, or is HD version only beneficial for those who have an Ipad?
If you don't have iPAD, you should buy iphone version. It will have retina compatibility. HD one is your normal universal version.