"Leave Me Alone" is on Bad, but not on all versions. I had the cassette growing up and it wasn't on there. so I can see why it might have gotten left off. I definitely think it should be added though. And maybe include the Dangerous album too.
I would love to see the album Dangerous added to this quiz so that Black or White and some of his other good songs from that album would be part of the quiz.
It wasn't on any of the three albums in this quiz. Blood on the Dance Floor was recorded during the recording of Dangerous in 1991 (which also isn't on this quiz), but wasn't released until 1997 with Michael's remix album.