There's no escape from the endless zombie hordes. The zombie bloodstains go on forever on the bloody highway leading out of the city. Drive through the center of the shambling corpses and watch their lifeless limbs go flying off the road. To max out zombie kills, you can bring a friend along to gun down the walking dead in an endless drive-by down the highway!
This is the kind of intense action you can find in the annals of the popular zombie games. Play funny zombie party games where zombies are the props in a gory chess match. Or make the horror of surviving in a zombie-infested nation your main concern as you sneak from house to house looking for supplies with that creeping knowledge that a slobbering brainless zombie is waiting in the closet. They always are.