The player who most recently visited a mall goes first (or choose your own method to determine and remember the first player). The game is played in a series of Turns performed by the Human Players, and after each Turn, the Zombie Player performs an action. This continues until the Humans or the Zombies achieve their goal:
To complete their 3 Objective Cards. If they do this before the game ends, then they win.
Either to kill Humans and attack the Courtyard until no Survivors remain, OR to prevent the Humans from completing their Objectives until all the Search Cards have been revealed and they’ve each taken one final Turn, in which case they are hopelessly overrun. The Zombie Player (or the game A.I.) then wins.