Mean Streets is the first map that the player must beat in SAS: TD.
The beginning of the map is where all of the Zombies come from. They come from the left, and continue to turn and go up, where they then again go and turn right. They continue to where they turn up at the two cars. Then, after going over them, they continue onward to where they turn down, and then to the left, where thy make a sharp turn down. This is where they exit the map.