I forgot to race the winners of each group so here you go! Original 2015 B Track Time video
This is the most affordable Hot Wheels Wall Tracks set. It is around $12 in the USA. My recollection is that it arrived early in 2012. It is a gravity set that does not require batteries. It is connectible with other Wall Tracks sets.
Just4fun290 presents this Spiderman Speed Circuit from Hotwheels! Watch as Spider-man tries to capture Electro in his spidey web!!