All numbers are in a slide. Slides from left to right. Under number 4 is the free hole. A difficult puzzle, but it can be solved. Assignments on the back of the puzzle. Material acrylic.
Put the same colours together. The white center piece can only slide up and down.Pieces cannot fall out due to transparent top plate. Matererial. Acryl.The pieces are covered with transparent foil. You can slide without damage.
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