Last month, Apple celebrated it's billionth app store download. In such a short time, no console developer has managed such a feat during a single generation of gaming. Instead of petering out over time and slipping in the quality department, the roster of games released on the service grows larger and more ambitious every day, with some truly innovative projects hitting the store. Perhaps none more ambitious than Car Jack Streets, an explosive crime simulator developed by resident Dundee developer Tag Games. We caught up with managing director Paul Farley to discover why his recently-released game stands out from the pack.