MAP21: Nirvana is the twenty-first map of Doom II, named after the Nirvana, the Buddhist Heaven, that ends the whole reincarnation cycle in Earth. It was designed by Sandy Petersen and uses the music track "Countdown To Death". Coincidentally or not, Kurt Cobain, the leader of popular rock band Nirvana, died by committing suicide with a shotgun blast the same year Doom II was released - whether it is somehow related to this fact or is a simple coincidence, there is a super shotgun right at the starting room of the map.