The time of day and night affects every mission. This city is a very different place at night and some missions can only be performed at certain times of day. For example, rain makes roads slippery, fog reduces visibility, etc. Unpredictable pedestrian AI makes for wicked nights and strange days throughout Liberty City. Hundreds of pedestrians each with their own characteristics populate Grand Theft Auto 3's intersections and alleyways.
Businessmen hurry to work, gang members look for trouble, and hookers prowl for business.
Each character acts and reacts to situations and the activity surrounding them in their own unique way. Over two hours of music make up the soundtrack for the City. Each vehicle is tuned to its own radio station playing a combination of licensed tracks, specially created music and talk radio.