As additional notes about the Binding of Isaac floors: the rooms represent the enemies found in each room and their approximate amounts in relation to one another, but not their exact amount. So it isn't a single Mulligan in the room to the left; it's a group of Mulligans. Also, we're treating the enemies as scaled to an Isaac that's three feet tall. So Fatties are five feet tall, spiders and flies are as big as birds, and so on.