You'll need a steady hand and a keen eye to maneuver all of the tiny metal balls into their spaces with these challenging mind teasers! These 1.5" square plastic cubes features a colorful interior puzzle that can be solved over and over again -- but can you do it? Each item will be a random puzzle from our assortment of unique shapes and styles. Add your company logo, emblem or message to create a mind-bending branded promotion.