Foosball HD is a pretty easy and straight forward setup with the exact same elements as of a real foosball table including a goalie and rows of men. A choice of two modes is available with either two player mode or you can play against your iPad in either hard, medium or easy options.
Touchgrind is available for the iPhone and iPad where you take the role of a virtual tach deck which I'm sure nearly all of you have done physically before. I had a couple in a pencil case at primary school and got pretty good at performing tricks with it. But it's been such a long time since I have used one I have no idea whether Touchgrind is truly realistic. But who cares it's awesome fun!