The way I got there was by tapping on the Zombie coins button on the top right of the main menu or upgrades menu. That takes you to the IAP screen, scroll down and you'll see Facebook code.
No I am a tester but there's a social group for this maybe for testers I dunno. What's the highest y'all gotten to?
10000Z--->Facebook code,when you die . Find a bug,if you choose update one of the options you can't choose other .
Please: Use only the beta testing social group to report the bugs : http://forums.toucharcade.com/group.php?do=discuss&discussionid=1347
damn showoff....lol just kidding brotherman I am totally jealous I missed the boat on this one though...
Great-looking trailer, and the game looks just perfect to me. Definitely can't wait for this one to drop!