This is one of the most versatile and challenging puzzles of all time. Mix up the numbers then slide them around to put them back in sequence. Be careful though, you might be down to your last row and have to mess up everything to get the numbers where th Game Play Information:Number of players: 1 to 2 Age of Players: 8 to 99 YearsSkill level: IntermediateTime to Learn in Mins: Information Not AvailableTime to Play in Mins: Information Not AvailableProfanity: NoBatteries Included: Not RequiredBattery Details: Choking Hazard: NoAdditional Information:Publisher: Go! Games Item ID: 400069329973 Product Dimensions: 5.75" x 5" x 0.6" Language: EnglishCountry of Origin: CN