there's not enough buttons with an ipod.
a gameboy has A,B,Left,Right,Up,Down,Start,and Select.
and IPod has in essence Left, Right, Up, Down, A but then there are no buttons for getting to the game menu or even to the rockboy menu so you can get back to your player. There's just not enough buttons so gameplay will always be a little funky with rockboy on the ipod.