It seems to me like you need to make the demo somehow not as good as the iphone version, but someone also giving you the same feeling. What about sprucing up th

It seems to me like you need to make the demo somehow not as good as the iphone version, but someone also giving you the same feeling. What about sprucing up the animation/graphics of the iphone version? Or create special features that are only available when you buy the game? That way, when you remove the level limit, players will get hooked on the demo and want to play more, and everywhere they go.