Board Thread:Questions and Answers/@comment-24633845-20140304205340/@comment-24145588-20140305003558

The nursery (egg) scratch ticket is available for free once per week. You can also buy the tickets more often than that, but it costs diamonds, and has a low chance of paying off, so that's really not recommended.

Your nursery must be empty when you play, since whatever egg you win will need to be immediately placed in the nursery.

The nursery scratch tickets are available on all five of the Natural islands; I don't think it's available on Ethereal or Shugabush.

When your nursery is empty and you select it, you'll be shown an option for a scratch ticket in the lower right corner of the screen. If you have a free ticket available, there will be a small exclamation point on the scratch ticket icon. If it's been less than a week since the last time you played a free ticket, the icon will be displayed without the exclamation point, meaning you can get a scratch ticket, but you would have to pay for it.

If you keep your nurseries full most of the time, it's easy to overlook the weekly free ticket, so you need to remember to look every now and then when your nursery is empty.