QT from FNF is cute just as her name dictates, but she is also quite musically skilled and fearsome in a rap battle, which is why you and BF will have quite an awesome time fighting against her, something that we invite you all to do right now with this mod and its songs:
Help BF defeat QT, who is both cute and deadly!
From the game's main menu you have to make a choice between the story mode and free play mode, but no matter how you pick to play, the only way you win is if you reach the end of the songs by playing all their notes according to the charts, something that will be represented by the progress bar leaning towards you.
So, when arrow symbols match above BF's head, press the identical arrow keys to hit the same notes, and keep doing it without missing too many notes in a row, because if that happens, you lose and have to start again. Enjoy!