Talk:Sans/@comment-27591590-20160120130110/@comment-27652627-20160122031538

That's odd, usually after the mettaton fight you go take the elevator to the capital, and from there go straight to judgement hall. Save in judgement hall. Then you talk to sans.

After you talk to him CLOSE the game WITHOUT saving, talk to him again (yes, he will appear, and he will repeat dialogue), and then he will ask you something like if youve heard this before. Then you close the game, again w/o saving, he will appear again and soon enough he will give you the key to his room.

Hope it works~