I Built a K’NEX Coaster… Down My Basement Stairs

During his week off between school and summer camp, 12-year-old Henry built a K’nex roller coaster up and down our basement staircase. The lift hill is around 12 feet long, takes the coaster up 9 feet and drops around 8.7 feet, yet the coaster is never more than about 16 inches directly above the ground. Uses one Screamin’ Serpent set and one Rippin’ Rockit set (plus more for the supports).