A free app for Android, by Smashing Geeks.

The Gangstar Vegas Crime Simulator is the best and most complete game for the Android platform. It is a full-scale game with a huge map, a large number of missions and challenging levels. You can play it on your mobile devices or your PC. The gameplay is based on the concept of a crime simulator. You will play as a low-life criminal and will have to take part in gang wars and crimes. You will be the leader of the gangsters and will have to take part in the criminal activities in the city.

You can download it for free on the Google Play Store.