As you should expect from a mod called FNF: Friday Night Madness, this is yet another amazing crossover with the Madness Combat series that we know so many here love, and they should, because it is awesome, but this one features even more antagonists than you are used to and is packed with songs too:
Let's have a Friday Night Madness!
Make your choice between the story mode and free play mode, and then, in either case, help BF defeat his rivals by reaching the end of the songs, something you do by hitting your notes according to the charts.
How? Well, when you see arrow symbols float and match above BF's head, that is when you press the identical arrow keys. Be careful not to miss hitting your notes multiple times in a row, or you lose. Good luck, enjoy!