Friday Night Funkin But Some Colors Are On Keith is a free online rhythm game available at fnf.gosprunki.net. This is a simple, straight-to-the-point FNF experience with familiar mechanics.
As the creator explains: "It's basically like DDR, press arrow when arrow over other arrow. And uhhh don't die." Time your key presses perfectly to match the scrolling arrows. Maintain your combo and health bar to survive each song.