User blog comment:BeholdtheVision/Ultimate OC vs. OC- Winter 2014/@comment-1745092-20140220153539/@comment-1745092-20140221155429

It's from The Quillan Games by D. J. MacHale. Two players on a somewhat unstable platform on top of a REALLY high tower. They fight each other until one of them falls to their death. The one who remains alive wins.