The Last of Us if that counts as a zombie game. Then there's also TellTale's The Walking Dead. Both games are more about the narrative though so as far as a "traditional" zombie game goes I'd have to go with Dying Light.

 

I didn't find the right solution from the Internet.

 

References:

http://forums.toucharcade.com/forumdisplay.php?f=19

 

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