Grand Theft Auto: Chinatown Wars first came out for the Nintendo DS back in March, 2009. Since then it’s been ported to the PSP and iOS. Today? There’s Grand Theft Auto: Chinatown Wars HD for the iPad [iTunes link]. I cannot think of another GTA release that’s had so many releases across so many different platforms across such a span of time.
I would imagine that playing the game with the iPad’s touchscreen controls are a little more easy to handle than having to fuss around with a DS stylus.