DIY String-Maze Foraging Box (step-by-step) Materials: a cardboard box, a screwdriver (or hole punch), assorted strings/yarns/ribbons in different colors and thicknesses, tape (or just tie knots), cat treats or small toys. 1. Take a cardboard box and cut off all four flaps so you’re left with the box walls and base. 2. Use a screwdriver to poke holes all around the sides of the box (space them however you like). 3. Thread different strings through the holes in a criss-cross pattern, more or less