Board Thread:General Discussion/@comment-26347196-20160410032827/@comment-28175157-20160411144244

I would not say one is harder than the other, I would say both are equally hard. It took me about two weeks or so to beat Undyne, pretty much same for Sans, and most people I know consider them equally hard as well. Their battles are all about memory, they use the same attacks all the time and most of them are similar to each other so you only need to remember them and know how to dodge them.