Place the pieces in the frame, Place the black piece with the holes on it. You should now see the 0 and 9. (start position). There are several ways to do this, There is only 1 good to slide to the numbers 1 to 4. Then slide to the numbers 5 to 8, Then slide the 0 at the top left and the 8 at the bottom right, Place the black piece on it so that you only see the 0 and 8. (end position)
€25.00