The City Advent Calendar is the one that I chose each year. I'm also getting my grandson his own set this year as well (he turns five this month and is doing builds way beyond his age level already. I had also picked up a Hot Wheels for him but, once I saw this set, I decided to give him the hot wheels for his birthday month instead of for the holidays.This year is another fun one with lots of builds and five minifigures (this does not include the robot or the snowman). Last year there were six but I am okay with one less as some of the builds are going to be lots of fun. The box refers to three other Lego kits that potentially coordinate with the toys in the calendar. Those kits are all really expensive, so if you are looking at this for a child and want something to go with it, try looking at some of the smaller kits that are available.The product description shows a breakout of the actual items included. I opened my set to verify that each window had a bag (I've had a kit miss one before.) I've also had pieces missing or a bag swapped out. Lego is great at replacing whatever is necessary if yo contact them right away.In addition to this set, one of my other favorites in Lego is to put together Christmas dioramas with the special winter scene sets and the City Advent calendars. I have a traditional train but may want to do the Harry Potter version this year. I'm starting to add these around my modular building sets to have an entire town. Legos are simply a lot of fun to play with and my grandchildren are having a blast with them. At their house, they've taken over the dining room as their Lego build room and they are only almost five and two years old.Be sure not to throw away the box as it is part of the fun. This year the box opens up an area for vehicles to play. There is a monster truck track, a helicopter landing pad, a race car straight track and a view from space. While the area is not coordinated together, it should prove lots of fun for kids to play with each of the elements in the set.