Koi is a human-fox who you and BF now have to defeat right now in a new FNF battle we're sure you will really enjoy and have a ton of fun with, especially when you see how many amazing tracks this mod has:
Help BF defeat FNF's Koi!
From the main menu you have to make a choice between the story mode and free play mode, and then, in either case, give your best to reach the end of the songs by playing their notes according to the charts.
So, when you see arrow symbols match above BF's head, that is when you press the identical arrow keys. Don't miss hitting the notes too many times in a row, or you lose. Good luck, enjoy!