Product DescriptionThinkFun Fifteen PuzzleFrom the ManufacturerFifteen Puzzles are one of the world?s most recognized and popular puzzles. It bridges generations. Players scramble the numbers and then put them back in numerical order. This faithful reproduction is constructed of smooth, polished stainless steel and decorative enamel. It has thirty-one challenges, instruction booklet with solutions and leatherette travel case. This puzzle is a single player puzzle.