GraviTrax is an innovative marble run and contruction toy for boys and for girls ages 8 years and up. It is an ideal christmas gift or birthday gift for smart, curious kids. Raise your track to new heights with the lift pack! Press the lever as a marble enters the Lifter at the bottom to release the marble at the top. Innovative - The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with engineering, gravity, magnetism, and kinetics to propel your ball to the finish. Infinitely Expandable - Gravitrax in fully expandable with a large range of expansion pack and accessories! An amazing building toy! Develops critical skillsPlaying and building with GraviTrax builds spatial reasoning and planning skills, and provides a great stealth learning experience. Clear instructionsComes with clear instructions so that you can start construction and start playing with this fun brain game within minutes