Here’s what comes in the box: a bag of pieces, the cardboard is a center support, and two instruction papers. Its good to get a piece of cardboard that fits all the way under the puzzle, so you can move it around from table to table as you work.
As you are taking out the sections with red dots, separate the pieces into lots of boxes. If they look similar, put them in the same box.
If I had it to do over again, I would start with the 4 towers that sit on the corners of the base support. When I got all finished, the towers did not fit easily or correctly. It could be my mistake with how I did the base pieces, or it could have been the puzzle company. I didn’t want to take off the base corners to find out. I didn’t care that much, but I would have cared in the beginning. So build the towers first, then build the base and make sure the towers fit those corners.