I buy it as a gift for my nephew and kids in October/November every year because they look forward to something interesting. They get so many toys that the parents appreciate the gift to open later. I've also used them as a reward for the kids as an incentive (good behavior/bringing home a full work pack from school) although decorated in a Christmas theme the doors are numbered so you can use them anytime. Each tag is individually wrapped so each build stays together until you're ready to build. Some of the parts are built on top of each other, but they are all independent assemblies. Most of them are extremely simple and don't take long to create, but the anticipation of each day is the real beauty of this calendar. I think this set is more for boys. The Lego Friends set is great for girls. It has more food and little animal figures which my daughter loved. Although the calendars are a little pricey I think this is a good deal overall as the kids seem to enjoy each item more than buying a large set.
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