The Screamin' Serpent Roller Coaster by K'nex features twisting, turning excitement for the entire family. Little construction experts can learn basic physics, including velocity and acceleration. Two AA batteries and three AAA batteries power the motor--but this big investment in power is well worth it. The Coaster actually zooms up over an incline and evokes screams and shouts from its riders.

You can strap tiny riders into their seats and watch them go through the loops at relatively fast velocities. The Screaming Serpent Roller Coaster is great for kids ages eight and up. It measures more than six feet in length, but you can get a slightly shorter model with a canopy--around five feet long.