Weegee, the most cursed version of Luigi from the Super Mario Bros Games returns right now as an antagonist in Friday Night Funkin', with this new mod called 'Invasion', where you go up against this meme creepypasta on quite a few new songs:
Defeat Weegee a second time and stop his invasion!
From the main menu you will have to make a choice between the story mode and free play mode, but no matter which of the two you pick, to win you have to do the same, which is hitting all your notes according to the charts until you reach the conclusion of the songs.
So, when you see arrow symbols match above BF's head, press the identical arrow keys at the same time. Be careful not to miss hitting those notes too many times in a row, or you lose and have to start again from scratch. Good luck, enjoy!