Angry birds seasons

I haven't played this for a whie and when i came to download it again i noticed quite a few things have altered. I think I was up to the tropical island when I played last so I can see there's been plenty of updates! I think I've figured most things out like the daily quests which are a bit like the missions in angry birds space. Couple of things though, what do you use the eggs with the crowns for? And also, do I have to unlock the old levels by paying with coins? any help much appreciated.
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