Try the new FNF Ben 10 skin mod, where Boyfriend becomes Ben, and together with him, you have to defeat various alien villains from outer space, not with the Omnitrix, but with your musical skills!
Try the new Ben 10 skin of FNF!
After making your choice between the story mode and free play mode, help Ben defeat his antagonists by reaching the end of their songs in either case. To do that, press arrow keys at the same time as the identical arrow symbols match above his head. Press them wrong, late, or early, and a note is missed, and multiple missed notes in a row mean you lose the game. Good luck, enjoy!