Best Gift for 6-14 yr girls & boys: Build, Play, Learn: 174 Parts, BUILD TIME: 120 min; STEM Concepts: Centrifugal Force, Rack n Pinion Gears, Elasticity | Screen Free Fun : Longer Constructive Activity,Multiple Gameplays,Core STEAM Learning and Superior Engagement Time Per Rupee than other DIY toys | Children Learn Best Through Play: Smartivity helps in Brain Development of your child with STEAM Concepts based game | Trusted By Parents, Loved By Children in 24 Countries (incl USA, Europe) | Designed by IIT Alumni in Collaboration With Children: Evaluated and approved for Construction, STEAM Learning and Fun Quotients by Smartivity STEMNinjas