Talk:Lab/@comment-28462098-20160713233048/@comment-28924002-20160807123805

You can't until the end of the True Pacifist run- You hang out with Papyrus after fighting him, then with Undyne after fighting her, and at some point after the Neutral Route final boss, Undyne gives you a letter to deliver to Alphys- You go on a date with her, and when you go to the lab again, the "bathroom" will be open- It's actually not a bathroom- It's the elevator to the True Lab-