User blog comment:TUSF/Light Novel Chronology/@comment-1173941-20121227131055

Decided to go ahead and list the floors each chapter starts off from... Seeing as Chapter 12 is right after the 74th boss is defeated, I just labeled it as 75th...

I don't know what floor was the front-lines while Kirito was with Sachi though... I found what floor it was when he was trying to get the revival item, but I can't find anything that indicates the floor of the front lines at the start...