In the FNF vs. Rainbow Friends mod, popular Roblox characters are brought into the Friday Night Funkin' world so that you can use Boyfriend's singing abilities to get out of the odd amusement park Odd World. Boyfriend will face up against the four Rainbow Friends, Blue, Green, Orange, and Purple, in a rap battle set to the tune Friends To Your End. They will all sing in unison, to their own beats, and wave their arms around to try to win over Boyfriend. You'll need all your wits about you to prevail in this frantic and occasionally terrifying conflicto.