Talk:Undyne's Letter/@comment-27993987-20160317032403/@comment-4360159-20160317040723

To my knowledge, once you have the letter you're good to go, because at that point you should meet all the requirements (I think). It implies you already befriended Undyne and Papyrus (unless you can befriend Undyne without befriending Papyrus first??), and if you've killed anything– you wouldn't even get the call (I think, again).

Just in case, read what Cheeseskates linked to, and if your issue isn't anything listed...

Well, we'll see when it comes to that.