The Smart Egg brianteasers are fun-packed, challenging puzzles to entertain your Head and Hands! Available in two different sizes, these Egg-shaped puzzles are mind-bendingly difficult brain teasers, with a seemingly endless number of variations. The hand-held Smart Egg brainteaser offers a balance of educational logic and problem solving, to help keep developing and engaging the player.  A great gift for any puzzler and the perfect size for on the go entertainment. Suitable for age 10 years and over and available in CDUs