User blog comment:Damac1214/Extinction Mode Reveal Trailer Released/@comment-78.97.184.212-20131030133423/@comment-1854594-20131031083702

Depends on what is required. The zombie AI in Treyarch's games can be boiled down to "Figure out fastest route to a player, travel on said route, if close to player make swiped at him." Coincidently this AI made for one of the best survival modes ever made.