This stainless steel and enamel version of the world's best-selling puzzle was originally introduced in 1933. To play, scramble the 15 numbered tiles in the tray, and then try to slide them into correct numerical order. Includes instruction book with over 30 challenges and a leatherette travel pouch. Manufacturer recommends ages 8+ -- we think younger brains can have fun with this!  So, ages 6+.