Glue 4 craft sticks together at the corners to make a square. Repeat with (4) more crafts sticks. Let dry. These will be the sides of the frame.
Cut string into (6) equal pieces approximately 8” long. Hot glue a marble to the center of one of the pieces of string. Repeat to end up with (6) separate marbles, each glued to the center of a string.
Make (6) marks along two craft sticks every ½”. Tape one end of the strings with marbles attached along one of the craft sticks at each mark. Set aside.
Take the two sides and hot glue a craft stick perpendicular to each corner. Glue the craft stick with the taped string/marbles to one side of the frame. Glue the second marked craft stick to the opposite side of the frame.
Tape the loose end of each string with a marble attached to the marked craft stick. Pull on the strings gently to make sure the marbles align. Pull one of the end marbles up and let go. Have fun playing with this!