The 15 Puzzle (Number Slide Brain Teaser) with Clear Carry Case Party Bundle - 4 Pack, is AWESOME! The "15 Puzzle" consists of 15 squares numbered from 1 to 15 which are placed in a 4x4 box leaving one position out of the 16 empty. The goal is to reposition the squares from a given arbitrary starting arrangement by sliding them one at a time. Slide the numbers around and mix it up! Now put it back in order, not so easy! This challenging puzzle will keep the wheels turning! Makes a great gift & is perfect for party favors, stocking stuffers, baskets, special needs, promotions and so much more! For Ages 8 and up - Fun for the whole family! - Puzzle measures 2.5" x 2.5" x .2"