Talk:Sans/@comment-27281153-20151129234802/@comment-26859076-20151203084413

Depends on the replays. Some timelines he knows, some he doesn't, I think.

In one scenario, if you follow the whole secret code thing, you'll end up in Sans' room, and Papyrus plainly notices that Frisk is being pranked "across time and space".

One could say that the Sans you play in that timeline--cough, I mean replay--told or showed his brother more about his powers.