The Great Wall of Fall is an obstacle used in the Wipeout Zone of Season 4. It is a 50-foot-long wall containing of several cylindrical pegs randomly retracting into the side that contestants must make their way across to the finish platform.
The contestants who crossed it on their first attempt are:
Christian Cannon (S4E17)
Tony Lee (S4E20)
Bryan Norman (S4E26)
Danielle Connolly (S4E28)
Jon Davis (S4E29)
Katie Davis (S4E29)
Brenton Kuipers (S4E30)