If it's the glue on the puzzle. Generally refers to the transparent glue coated on the puzzle, not the front. That is, the patterned side, there will be no traces after drying, which can make the surface color of the puzzle look better and brighter. If the picture itself is of good quality, you can basically pick it up with a layer of glue. If it is a poorly blocked picture, many layers are needed. But for educa's bite, such as 2000 cans, no matter how many layers, it is impossible to lift the whole piece.

Puzzle:

Puzzle game is a popular puzzle game, with various types and great difficulty? . As early as 1760, this popular and beneficial form of entertainment appeared almost simultaneously in France and Britain. Stick a picture on a cardboard and cut it into irregular pieces. At first, these pictures were all educational, either accompanied by short articles suitable for young people to read or imparting historical or geographical knowledge to the emerging bourgeoisie.