Add this crazy trick part to your existing Wall Coasters to make zany new designs!;Use your imagination and the basic laws of Physics and gravity for hours and hours of fun;Create fast drops, big jumps, and crazy twists, then tear down, rebuild, and start again!;Invented by a 12-year-old marble run aficionado. Develops strategy and spatial reasoning;Includes one Crazy Stairs Add-on Trick, 2 lightweight marbles, and extra coaster tack

• Wall Coaster Crazy Stairs Add-On Trick Part

Wall Coaster Crazy Stairs Add-On Trick PartWall Coaster