Using this Bluey Christmas Swim Advent Calendar is easy! Starting from December 1st, open one window each day until Christmas. You'll find various Bluey - themed items like figures, accessories, stickers, and a Christmas tree. When you get the tree pieces, put them together and place all the gifts you've collected underneath it. As for maintenance, keep the calendar and its contents in a dry place to avoid damage. And remember, this calendar is meant for kids aged 3 and up, so adult supervision might be needed for younger kids to ensure safety.