PetVille wants you to free the mysterious creature within

PetVille is the second Zynga game to launch a quiet and unannounced new feature this week. When you log into your pet's room, you'll find that PetEx (a spoof on FedEx) has transported a creature caged inside a pet carrier. It looks scared and cries a lot, and your pet is obviously worried.

Your first instinct is to let the poor thing out, but you'll need to get the secret combination for the lock through e-mail!