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.
A puzzle from 1898. Copy of "Le Fermier Avisé" from "The book of ingenious & diabolical puzzles", Jerry Slocum and Jack Botermans Place the 9 cardboard pieces in a square of 3 x 3 pieces. Where 2 numbers lie against each other, the sum must always be the same. So: In each square cage the same number of chicks. To make the puzzle more beautiful I made adjustments,