If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Zombies are everywhere. Your only hope for survival is to keep moving and loot buildings for supplies.
How long will you last? Manage your crew, upgrade your car and drive into hordes of zombies. Will you leave everyone behind on a solo mission or take the risk to run out of food and help everyone you can? It is your choice.