Solar system puzzle

1. Prepare a piece of thick cardboard that is larger than the completed size of the puzzle in advance, and put it under the puzzle before assembling, so as to facilitate the movement and collection during the assembly process, and prevent the puzzles from being scattered and lost. 2. First find out the number of pieces with straight lines on one side and two sides, combine the four sides of the picture, and then gradually move towards the center of the picture, which can reduce the time for jigsaw puzzles. 3. When assembling, if the puzzle pieces cannot be tightly fitted, or the tones are different (especially when dealing with pictures of the same color system, you should pay more attention), do not force the combination, please spend some more time to find the correct number of pieces . After the preservation method is completed,