When I first played GTA: Chinatown Wars, the first words that came to mind were How?, and Awesome...
Rockstar has manged to fit 2 of the main islands (the eastern ones) and the other 2 that are not as a large but sit north of the most eastern one and the smaller that lies between them (I don't know the names), into a DS cartridge? How? And as a top down 3D perspective? I know, the graphics are cel-shaded..ish, but for a DS game they really look stunning.
There are many things to do in that city, of course, plenty of main and side missions, rampages and mini games, One of the mini games is Hobotron, one of my faves, where you basically have to survive by shooting guys who chase you, or blow them up with time bombs! The touch screen is used nicely too... for instance if you land your car into water (we all do this occasionally, right?) you have to tap the windscreen to smash it and escape, otherwise you're sleeping with the fishes. On another you can make your own Molotov Cocktails by going to a gas station, dilling a bottle with the stuff and putting in a cloth, really cool.
It sounds ok too, some pretty funny one-liners when you're chasing some poor fellow with a gun, and so on. The music isnt that great, but as you can turn it off, you can just listen to that guy you are trying to run over shout 'I'm still a virgin!' Classic!
Overall GTA:CW breaks all the rules of DS gaming and deserves it's place as a classic for the console. Get it while it's still £9.99 here, you will not regret it.