Fr□m heart-pounding m□s□io□s□to outrag□ous ga□e□, t□e challe□□es in "Ru□ning□□an□20130□31" ke□t□both the cast m□mbers□an□ viewers on □he □d□e of their seats□ W□ether it□□a□ a race□against time □o complete a□□a□k or a ga□e of wits to□outsmar□ their opponen□s, each cha□l□nge□bro□g□t □ut th□ □ompetit□ve spirit a□d comedic timin□ □f the part□cipan□s□□>