K'Nex Thrill Rides - Typhoon Frenzy RollercoasterK'Nex Typhoon Frenzy Roller Coaster 649 Piece Bring an ocean wave of fun to your living room with the new K'NEX Typhoon Frenzy Roller Coaster Building Set from K'NEX! Build with over 640 K'NEX parts and pieces, including rods, couplers and track pieces, and add motorized power to make the silver cart spin and whiz across nearly six meters of swinging, endless action! KNEX is a rod and connector building system that lets you build big and make it move!