This wooden 5 piece puzzle not including the tray, is 80mm x 80mm, with the tray it is 100mmx100mm.
Cut the file out. If you don't want to make a tray to go with it, delete the lower square and the outer square around the puzzle.
If you didn't build the tray then your puzzle is complete. If you did then square A needs to be glued on top of square b, as marked in the file, with all the sides flush. Put the puzzle pieces in as shown in the picture. Your puzzle is now complete!