Features: - Experience the power of gravity Gravitrax interactive track system - Design: Follow the plans or challenge yourself by designing your own marble run racing system - Build! With over 100 pieces + 18 unique action parts, the Starter Set gets you launched - Expand! Add expansion sets and action accessories for infinite possibilities - Race! Gravity determines each ball's destiny but you have the power to chnage it - Learn! Fun science and engineering concepts like gravity, magnetism and kinetics make STEM exciting - Added bonus! Download the free app and add to the excitement What's in the box Instructions Construction plan booklet Task Booklet 4 base plates 2 transparent levels 6 balls 40 large height tiles 12 small height tiles 21 curves 3 junctions 2 switches 1 3-in-1 block 1 vortex 1 launch pad 1 magnetic cannon 3 long tracks 6 medium tracks 9 short tracks 1 nish line 4 basic tiles Inserts for basic tiles: 2 catchers, 1 freefall, 1 splash, 1 landing