Display resolution

The display of the new iPhone 4 has a resolution of 960x640 pixels (or 640x960 in portrait mode).
The older iPhone 3 has a resolution of 480x320. You are strongly advised to design your game for the
iPhone 4 resolution, that is, 960x640 pixels. When the game is then run on an older iPhone 3 it is
automatically scaled down to 480x320, so there is nothing you need to do for this. You will lose
some detail in the images but because the display is rather small, this is not a problem. (You anyway
should not put too much detail in the images because the pixels are very small on the iPhone 4.)
The iPad has a resolution of 1024x768, which is somewhat (but not too much) larger than the iPhone
4. To make your game work well for both the iPhone and the iPad you  have a few options. When
your game has a small set of rooms we recommend that you create two versions of all rooms, one
set of size 960x640 and one of size 1024x768. Now create a first room. In this room place a single 15
instance of a controller object. In it