Board Thread:Plants vs. Zombies 2: It's About Time/@comment-5460584-20150429233633/@comment-24275721-20150503140543

So currently, Dark Ages is the only world to not feature a zombie in the world selection screen in it's design (even though, once you enter the world you can see that Majora's Mask-esque zombie moon behind the castle).

Can someone tell me why that is? Why didn't Popcap put the moon head in the world selection screen as well?